Public bug reported:

Boot testing fails for b/gcp-5.4 on new c3a-standard instance as below:

Causes WARNING at: arch/arm64/kernel/cpu_errata.c:1387
spectre_bhb_enable_mitigation+0x148

[    0.060607] WARNING: CPU: 3 PID: 29 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
[    0.060612] WARNING: CPU: 2 PID: 23 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
[    0.060613] Modules linked in:
[    0.060615] Modules linked in:
[    0.060621] CPU: 3 PID: 29 Comm: migration/3 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
[    0.060622] CPU: 2 PID: 23 Comm: migration/2 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
[    0.060628] WARNING: CPU: 1 PID: 17 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
[    0.060629] pstate: 20400085 (nzCv daIf +PAN -UAO)
[    0.060630] Modules linked in:
[    0.060632] pc : spectre_bhb_enable_mitigation+0x148/0x228
[    0.060635] lr : spectre_bhb_enable_mitigation+0x120/0x228
[    0.060636] CPU: 1 PID: 17 Comm: migration/1 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
[    0.060637] sp : ffff80001012bce0
[    0.060639] pstate: 20400085 (nzCv daIf +PAN -UAO)
[    0.060639] x29: ffff80001012bce0 x28: 0000000000000002 
[    0.060642] pc : spectre_bhb_enable_mitigation+0x148/0x228
[    0.060645] lr : spectre_bhb_enable_mitigation+0x120/0x228
[    0.060646] x27: ffff80001003bd10 
[    0.060647] sp : ffff8000100fbce0
[    0.060647] x26: 0000000000000000 
[    0.060648] x29: ffff8000100fbce0 
[    0.060650] x28: 0000000000000002 
[    0.060652] x25: 0000000000000060 
[    0.060653] x24: 0000000000000000 
[    0.060655] x27: ffff80001003bd10 x26: 0000000000000000 
[    0.060657] x23: 0000000000000001 
[    0.060661] x22: ffffdca01ea9a3c0 
[    0.060663] x25: 0000000000000060 x24: 0000000000000000 
[    0.060665] x21: ffffdca01dda4970 
[    0.060668] x20: 0000000000000001 
[    0.060669] x23: 0000000000000001 x22: ffffdca01ea9a3c0 
[    0.060671] x19: ffffdca01ecca000 
[    0.060675] x18: ffffdca01dc56a10 
[    0.060680] x21: ffffdca01dda4970 x20: 0000000000000001 
[    0.060684] x17: 00000000bc8dcec3 
[    0.060687] x16: 00000000b1e1b9b5 
[    0.060688] x19: ffffdca01ecca000 x18: ffffdca01dc56a10 
[    0.060694] x17: 000000007e50fa5f 
[    0.060694] x15: 0000000000000001 
[    0.060695] x16: 000000009cd7320e 
[    0.060696] x14: ffff74e6bd9c01c8 
[    0.060699] x13: 0000000000000004 
[    0.060701] x15: 0000000000000001 
[    0.060702] x12: 0000000000000228 
[    0.060703] x14: ffff74e6bd99f1c8 
[    0.060705] x11: 0000000000000000 
[    0.060711] x13: 0000000000000004 
[    0.060712] x10: 0000000000000b00 
[    0.060713] x12: 0000000000000228 
[    0.060716] x11: 0000000000000000 
[    0.060722] x9 : ffff80001012bd20 
[    0.060723] x10: 0000000000000b00 
[    0.060724] x8 : ffff74e6ba3c66e0 
[    0.060726] x7 : 0000000000000000 x6 : ffffdca01d822000 
[    0.060727] x9 : ffff8000100fbd20 
[    0.060729] x8 : ffff74e6ba33a9e0 
[    0.060729] x5 : 00000000c00fac30 
[    0.060730] x4 : 0000000000000000 
[    0.060731] x7 : 0000000000000000 
[    0.060734] x6 : ffffdca01d822000 
[    0.060735] x3 : 000000000000000b 
[    0.060736] x2 : ffffdca01ecca508 
[    0.060738] x5 : 00000000c00fac30 x4 : 0000000000000000 
[    0.060740] x1 : 000000000000000b 
[    0.060742] x0 : 000000000000000b 
[    0.060746] x3 : 000000000000000b x2 : ffffdca01ecca508 
[    0.060749] Call trace:
[    0.060751] x1 : 000000000000000b 
[    0.060753]  spectre_bhb_enable_mitigation+0x148/0x228
[    0.060755] x0 : 000000000000000b 
[    0.060757]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
[    0.060761]  multi_cpu_stop+0xac/0x188
[    0.060762] Call trace:
[    0.060763]  cpu_stopper_thread+0xe4/0x1a0
[    0.060766]  spectre_bhb_enable_mitigation+0x148/0x228
[    0.060769]  smpboot_thread_fn+0x1a8/0x1d8
[    0.060771]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
[    0.060773]  kthread+0x114/0x118
[    0.060775]  multi_cpu_stop+0xac/0x188
[    0.060778]  ret_from_fork+0x10/0x18
[    0.060779]  cpu_stopper_thread+0xe4/0x1a0
[    0.060780] ---[ end trace 82b1638f0eea221b ]---
[    0.060783]  smpboot_thread_fn+0x1a8/0x1d8
[    0.060785]  kthread+0x114/0x118
[    0.060787]  ret_from_fork+0x10/0x18
[    0.060789] ---[ end trace 82b1638f0eea221c ]---
[    0.060797] pstate: 20400085 (nzCv daIf +PAN -UAO)
[    0.060799] pc : spectre_bhb_enable_mitigation+0x148/0x228
[    0.060800] lr : spectre_bhb_enable_mitigation+0x120/0x228
[    0.060801] sp : ffff80001015bce0
[    0.060802] x29: ffff80001015bce0 x28: 0000000000000002 
[    0.060804] x27: ffff80001003bd10 x26: 0000000000000000 
[    0.060805] x25: 0000000000000060 x24: 0000000000000000 
[    0.060806] x23: 0000000000000001 x22: ffffdca01ea9a3c0 
[    0.060807] x21: ffffdca01dda4970 x20: 0000000000000001 
[    0.060808] x19: ffffdca01ecca000 x18: ffffdca01dc56a10 
[    0.060809] x17: 000000002041ff62 x16: 0000000057377f7c 
[    0.060811] x15: 0000000000000001 x14: ffff74e6bd9e11c8 
[    0.060812] x13: 0000000000000004 x12: 0000000000000228 
[    0.060813] x11: 0000000000000000 x10: 0000000000000000 
[    0.060814] x9 : 0000000000000000 x8 : 0000000000000000 
[    0.060815] x7 : ffff74e6bd9f5bc0 x6 : ffffdca01d822000 
[    0.060816] x5 : 00000000c00fac30 x4 : 0000000000000000 
[    0.060817] x3 : 000000000000000b x2 : ffffdca01ecca508 
[    0.060818] x1 : 000000000000000b x0 : 000000000000000b 
[    0.060820] Call trace:
[    0.060822]  spectre_bhb_enable_mitigation+0x148/0x228
[    0.060823]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
[    0.060826]  multi_cpu_stop+0xac/0x188
[    0.060827]  cpu_stopper_thread+0xe4/0x1a0
[    0.060829]  smpboot_thread_fn+0x1a8/0x1d8
[    0.060830]  kthread+0x114/0x118
[    0.060832]  ret_from_fork+0x10/0x18
[    0.060833] ---[ end trace 82b1638f0eea221d ]---

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Description changed:

  Boot testing fails for b/gcp-5.4 on new c3a-standard instance as below:
  
  Causes WARNING at: arch/arm64/kernel/cpu_errata.c:1387
  spectre_bhb_enable_mitigation+0x148
  
- 
  [    0.060607] WARNING: CPU: 3 PID: 29 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
-               832             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060612] WARNING: CPU: 2 PID: 23 
at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
-               833             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060613] Modules linked in:
-               834             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060615] Modules linked in:
-               835             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060621] CPU: 3 PID: 29 Comm: 
migration/3 Not tainted 5.4.0-1122-gcp #131~18.04.1-Ubuntu
-               836             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060622] CPU: 2 PID: 23 Comm: 
migration/2 Not tainted 5.4.0-1122-gcp #131~18.04.1-Ubuntu
-               837             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060628] WARNING: CPU: 1 PID: 17 
at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
-               838             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060629] pstate: 20400085 (nzCv 
daIf +PAN -UAO)
-               839             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060630] Modules linked in:
-               840             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060632] pc : 
spectre_bhb_enable_mitigation+0x148/0x228
-               841             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060635] lr : 
spectre_bhb_enable_mitigation+0x120/0x228
-               842             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060636] CPU: 1 PID: 17 Comm: 
migration/1 Not tainted 5.4.0-1122-gcp #131~18.04.1-Ubuntu
-               843             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060637] sp : ffff80001012bce0
-               844             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060639] pstate: 20400085 (nzCv 
daIf +PAN -UAO)
-               845             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060639] x29: ffff80001012bce0 
x28: 0000000000000002 
-               846             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060642] pc : 
spectre_bhb_enable_mitigation+0x148/0x228
-               847             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060645] lr : 
spectre_bhb_enable_mitigation+0x120/0x228
-               848             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060646] x27: ffff80001003bd10 
-               849             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060647] sp : ffff8000100fbce0
-               850             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060647] x26: 0000000000000000 
-               851             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060648] x29: ffff8000100fbce0 
-               852             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060650] x28: 0000000000000002 
-               853             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060652] x25: 0000000000000060 
-               854             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060653] x24: 0000000000000000 
-               855             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060655] x27: ffff80001003bd10 
x26: 0000000000000000 
-               856             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060657] x23: 0000000000000001 
-               857             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060661] x22: ffffdca01ea9a3c0 
-               858             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060663] x25: 0000000000000060 
x24: 0000000000000000 
-               859             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060665] x21: ffffdca01dda4970 
-               860             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060668] x20: 0000000000000001 
-               861             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060669] x23: 0000000000000001 
x22: ffffdca01ea9a3c0 
-               862             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060671] x19: ffffdca01ecca000 
-               863             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060675] x18: ffffdca01dc56a10 
-               864             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060680] x21: ffffdca01dda4970 
x20: 0000000000000001 
-               865             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060684] x17: 00000000bc8dcec3 
-               866             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060687] x16: 00000000b1e1b9b5 
-               867             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060688] x19: ffffdca01ecca000 
x18: ffffdca01dc56a10 
-               868             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060694] x17: 000000007e50fa5f 
-               869             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060694] x15: 0000000000000001 
-               870             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060695] x16: 000000009cd7320e 
-               871             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060696] x14: ffff74e6bd9c01c8 
-               872             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060699] x13: 0000000000000004 
-               873             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060701] x15: 0000000000000001 
-               874             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060702] x12: 0000000000000228 
-               875             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060703] x14: ffff74e6bd99f1c8 
-               876             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060705] x11: 0000000000000000 
-               877             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060711] x13: 0000000000000004 
-               878             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060712] x10: 0000000000000b00 
-               879             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060713] x12: 0000000000000228 
-               880             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060716] x11: 0000000000000000 
-               881             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060722] x9 : ffff80001012bd20 
-               882             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060723] x10: 0000000000000b00 
-               883             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060724] x8 : ffff74e6ba3c66e0 
-               884             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060726] x7 : 0000000000000000 x6 
: ffffdca01d822000 
-               885             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060727] x9 : ffff8000100fbd20 
-               886             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060729] x8 : ffff74e6ba33a9e0 
-               887             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060729] x5 : 00000000c00fac30 
-               888             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060730] x4 : 0000000000000000 
-               889             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060731] x7 : 0000000000000000 
-               890             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060734] x6 : ffffdca01d822000 
-               891             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060735] x3 : 000000000000000b 
-               892             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060736] x2 : ffffdca01ecca508 
-               893             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060738] x5 : 00000000c00fac30 x4 
: 0000000000000000 
-               894             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060740] x1 : 000000000000000b 
-               895             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060742] x0 : 000000000000000b 
-               896             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060746] x3 : 000000000000000b x2 
: ffffdca01ecca508 
-               897             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060749] Call trace:
-               898             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060751] x1 : 000000000000000b 
-               899             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060753]  
spectre_bhb_enable_mitigation+0x148/0x228
-               900             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060755] x0 : 000000000000000b 
-               901             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060757]  
cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
-               902             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060761]  
multi_cpu_stop+0xac/0x188
-               903             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060762] Call trace:
-               904             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060763]  
cpu_stopper_thread+0xe4/0x1a0
-               905             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060766]  
spectre_bhb_enable_mitigation+0x148/0x228
-               906             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060769]  
smpboot_thread_fn+0x1a8/0x1d8
-               907             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060771]  
cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
-               908             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060773]  kthread+0x114/0x118
-               909             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060775]  
multi_cpu_stop+0xac/0x188
-               910             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060778]  ret_from_fork+0x10/0x18
-               911             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060779]  
cpu_stopper_thread+0xe4/0x1a0
-               912             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060780] ---[ end trace 
82b1638f0eea221b ]---
-               913             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060783]  
smpboot_thread_fn+0x1a8/0x1d8
-               914             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060785]  kthread+0x114/0x118
-               915             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060787]  ret_from_fork+0x10/0x18
-               916             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060789] ---[ end trace 
82b1638f0eea221c ]---
-               917             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060797] pstate: 20400085 (nzCv 
daIf +PAN -UAO)
-               918             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060799] pc : 
spectre_bhb_enable_mitigation+0x148/0x228
-               919             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060800] lr : 
spectre_bhb_enable_mitigation+0x120/0x228
-               920             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060801] sp : ffff80001015bce0
-               921             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060802] x29: ffff80001015bce0 
x28: 0000000000000002 
-               922             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060804] x27: ffff80001003bd10 
x26: 0000000000000000 
-               923             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060805] x25: 0000000000000060 
x24: 0000000000000000 
-               924             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060806] x23: 0000000000000001 
x22: ffffdca01ea9a3c0 
-               925             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060807] x21: ffffdca01dda4970 
x20: 0000000000000001 
-               926             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060808] x19: ffffdca01ecca000 
x18: ffffdca01dc56a10 
-               927             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060809] x17: 000000002041ff62 
x16: 0000000057377f7c 
-               928             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060811] x15: 0000000000000001 
x14: ffff74e6bd9e11c8 
-               929             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060812] x13: 0000000000000004 
x12: 0000000000000228 
-               930             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060813] x11: 0000000000000000 
x10: 0000000000000000 
-               931             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060814] x9 : 0000000000000000 x8 
: 0000000000000000 
-               932             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060815] x7 : ffff74e6bd9f5bc0 x6 
: ffffdca01d822000 
-               933             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060816] x5 : 00000000c00fac30 x4 
: 0000000000000000 
-               934             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060817] x3 : 000000000000000b x2 
: ffffdca01ecca508 
-               935             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060818] x1 : 000000000000000b x0 
: 000000000000000b 
-               936             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060820] Call trace:
-               937             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060822]  
spectre_bhb_enable_mitigation+0x148/0x228
-               938             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060823]  
cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
-               939             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060826]  
multi_cpu_stop+0xac/0x188
-               940             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060827]  
cpu_stopper_thread+0xe4/0x1a0
-               941             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060829]  
smpboot_thread_fn+0x1a8/0x1d8
-               942             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060830]  kthread+0x114/0x118
-               943             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060832]  ret_from_fork+0x10/0x18
-               944             02:18:03 INFO | Jan 23 02:17:01 
b-lgcp54-gcp-5-4-c3astd4-u-boot kernel: [    0.060833] ---[ end trace 
82b1638f0eea221d ]---
+ [    0.060612] WARNING: CPU: 2 PID: 23 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060613] Modules linked in:
+ [    0.060615] Modules linked in:
+ [    0.060621] CPU: 3 PID: 29 Comm: migration/3 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
+ [    0.060622] CPU: 2 PID: 23 Comm: migration/2 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
+ [    0.060628] WARNING: CPU: 1 PID: 17 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060629] pstate: 20400085 (nzCv daIf +PAN -UAO)
+ [    0.060630] Modules linked in:
+ [    0.060632] pc : spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060635] lr : spectre_bhb_enable_mitigation+0x120/0x228
+ [    0.060636] CPU: 1 PID: 17 Comm: migration/1 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
+ [    0.060637] sp : ffff80001012bce0
+ [    0.060639] pstate: 20400085 (nzCv daIf +PAN -UAO)
+ [    0.060639] x29: ffff80001012bce0 x28: 0000000000000002 
+ [    0.060642] pc : spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060645] lr : spectre_bhb_enable_mitigation+0x120/0x228
+ [    0.060646] x27: ffff80001003bd10 
+ [    0.060647] sp : ffff8000100fbce0
+ [    0.060647] x26: 0000000000000000 
+ [    0.060648] x29: ffff8000100fbce0 
+ [    0.060650] x28: 0000000000000002 
+ [    0.060652] x25: 0000000000000060 
+ [    0.060653] x24: 0000000000000000 
+ [    0.060655] x27: ffff80001003bd10 x26: 0000000000000000 
+ [    0.060657] x23: 0000000000000001 
+ [    0.060661] x22: ffffdca01ea9a3c0 
+ [    0.060663] x25: 0000000000000060 x24: 0000000000000000 
+ [    0.060665] x21: ffffdca01dda4970 
+ [    0.060668] x20: 0000000000000001 
+ [    0.060669] x23: 0000000000000001 x22: ffffdca01ea9a3c0 
+ [    0.060671] x19: ffffdca01ecca000 
+ [    0.060675] x18: ffffdca01dc56a10 
+ [    0.060680] x21: ffffdca01dda4970 x20: 0000000000000001 
+ [    0.060684] x17: 00000000bc8dcec3 
+ [    0.060687] x16: 00000000b1e1b9b5 
+ [    0.060688] x19: ffffdca01ecca000 x18: ffffdca01dc56a10 
+ [    0.060694] x17: 000000007e50fa5f 
+ [    0.060694] x15: 0000000000000001 
+ [    0.060695] x16: 000000009cd7320e 
+ [    0.060696] x14: ffff74e6bd9c01c8 
+ [    0.060699] x13: 0000000000000004 
+ [    0.060701] x15: 0000000000000001 
+ [    0.060702] x12: 0000000000000228 
+ [    0.060703] x14: ffff74e6bd99f1c8 
+ [    0.060705] x11: 0000000000000000 
+ [    0.060711] x13: 0000000000000004 
+ [    0.060712] x10: 0000000000000b00 
+ [    0.060713] x12: 0000000000000228 
+ [    0.060716] x11: 0000000000000000 
+ [    0.060722] x9 : ffff80001012bd20 
+ [    0.060723] x10: 0000000000000b00 
+ [    0.060724] x8 : ffff74e6ba3c66e0 
+ [    0.060726] x7 : 0000000000000000 x6 : ffffdca01d822000 
+ [    0.060727] x9 : ffff8000100fbd20 
+ [    0.060729] x8 : ffff74e6ba33a9e0 
+ [    0.060729] x5 : 00000000c00fac30 
+ [    0.060730] x4 : 0000000000000000 
+ [    0.060731] x7 : 0000000000000000 
+ [    0.060734] x6 : ffffdca01d822000 
+ [    0.060735] x3 : 000000000000000b 
+ [    0.060736] x2 : ffffdca01ecca508 
+ [    0.060738] x5 : 00000000c00fac30 x4 : 0000000000000000 
+ [    0.060740] x1 : 000000000000000b 
+ [    0.060742] x0 : 000000000000000b 
+ [    0.060746] x3 : 000000000000000b x2 : ffffdca01ecca508 
+ [    0.060749] Call trace:
+ [    0.060751] x1 : 000000000000000b 
+ [    0.060753]  spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060755] x0 : 000000000000000b 
+ [    0.060757]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
+ [    0.060761]  multi_cpu_stop+0xac/0x188
+ [    0.060762] Call trace:
+ [    0.060763]  cpu_stopper_thread+0xe4/0x1a0
+ [    0.060766]  spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060769]  smpboot_thread_fn+0x1a8/0x1d8
+ [    0.060771]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
+ [    0.060773]  kthread+0x114/0x118
+ [    0.060775]  multi_cpu_stop+0xac/0x188
+ [    0.060778]  ret_from_fork+0x10/0x18
+ [    0.060779]  cpu_stopper_thread+0xe4/0x1a0
+ [    0.060780] ---[ end trace 82b1638f0eea221b ]---
+ [    0.060783]  smpboot_thread_fn+0x1a8/0x1d8
+ [    0.060785]  kthread+0x114/0x118
+ [    0.060787]  ret_from_fork+0x10/0x18
+ [    0.060789] ---[ end trace 82b1638f0eea221c ]---
+ [    0.060797] pstate: 20400085 (nzCv daIf +PAN -UAO)
+ [    0.060799] pc : spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060800] lr : spectre_bhb_enable_mitigation+0x120/0x228
+ [    0.060801] sp : ffff80001015bce0
+ [    0.060802] x29: ffff80001015bce0 x28: 0000000000000002 
+ [    0.060804] x27: ffff80001003bd10 x26: 0000000000000000 
+ [    0.060805] x25: 0000000000000060 x24: 0000000000000000 
+ [    0.060806] x23: 0000000000000001 x22: ffffdca01ea9a3c0 
+ [    0.060807] x21: ffffdca01dda4970 x20: 0000000000000001 
+ [    0.060808] x19: ffffdca01ecca000 x18: ffffdca01dc56a10 
+ [    0.060809] x17: 000000002041ff62 x16: 0000000057377f7c 
+ [    0.060811] x15: 0000000000000001 x14: ffff74e6bd9e11c8 
+ [    0.060812] x13: 0000000000000004 x12: 0000000000000228 
+ [    0.060813] x11: 0000000000000000 x10: 0000000000000000 
+ [    0.060814] x9 : 0000000000000000 x8 : 0000000000000000 
+ [    0.060815] x7 : ffff74e6bd9f5bc0 x6 : ffffdca01d822000 
+ [    0.060816] x5 : 00000000c00fac30 x4 : 0000000000000000 
+ [    0.060817] x3 : 000000000000000b x2 : ffffdca01ecca508 
+ [    0.060818] x1 : 000000000000000b x0 : 000000000000000b 
+ [    0.060820] Call trace:
+ [    0.060822]  spectre_bhb_enable_mitigation+0x148/0x228
+ [    0.060823]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
+ [    0.060826]  multi_cpu_stop+0xac/0x188
+ [    0.060827]  cpu_stopper_thread+0xe4/0x1a0
+ [    0.060829]  smpboot_thread_fn+0x1a8/0x1d8
+ [    0.060830]  kthread+0x114/0x118
+ [    0.060832]  ret_from_fork+0x10/0x18
+ [    0.060833] ---[ end trace 82b1638f0eea221d ]---

-- 
You received this bug notification because you are a member of Canonical
Platform QA Team, which is subscribed to ubuntu-kernel-tests.
https://bugs.launchpad.net/bugs/2051184

Title:
  ubuntu_boot test failures on b/linux-gcp-5.4 on c3a-standard instance

Status in ubuntu-kernel-tests:
  New

Bug description:
  Boot testing fails for b/gcp-5.4 on new c3a-standard instance as
  below:

  Causes WARNING at: arch/arm64/kernel/cpu_errata.c:1387
  spectre_bhb_enable_mitigation+0x148

  [    0.060607] WARNING: CPU: 3 PID: 29 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060612] WARNING: CPU: 2 PID: 23 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060613] Modules linked in:
  [    0.060615] Modules linked in:
  [    0.060621] CPU: 3 PID: 29 Comm: migration/3 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
  [    0.060622] CPU: 2 PID: 23 Comm: migration/2 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
  [    0.060628] WARNING: CPU: 1 PID: 17 at 
/build/linux-gcp-5.4-FHHMzo/linux-gcp-5.4-5.4.0/arch/arm64/kernel/cpu_errata.c:1387
 spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060629] pstate: 20400085 (nzCv daIf +PAN -UAO)
  [    0.060630] Modules linked in:
  [    0.060632] pc : spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060635] lr : spectre_bhb_enable_mitigation+0x120/0x228
  [    0.060636] CPU: 1 PID: 17 Comm: migration/1 Not tainted 5.4.0-1122-gcp 
#131~18.04.1-Ubuntu
  [    0.060637] sp : ffff80001012bce0
  [    0.060639] pstate: 20400085 (nzCv daIf +PAN -UAO)
  [    0.060639] x29: ffff80001012bce0 x28: 0000000000000002 
  [    0.060642] pc : spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060645] lr : spectre_bhb_enable_mitigation+0x120/0x228
  [    0.060646] x27: ffff80001003bd10 
  [    0.060647] sp : ffff8000100fbce0
  [    0.060647] x26: 0000000000000000 
  [    0.060648] x29: ffff8000100fbce0 
  [    0.060650] x28: 0000000000000002 
  [    0.060652] x25: 0000000000000060 
  [    0.060653] x24: 0000000000000000 
  [    0.060655] x27: ffff80001003bd10 x26: 0000000000000000 
  [    0.060657] x23: 0000000000000001 
  [    0.060661] x22: ffffdca01ea9a3c0 
  [    0.060663] x25: 0000000000000060 x24: 0000000000000000 
  [    0.060665] x21: ffffdca01dda4970 
  [    0.060668] x20: 0000000000000001 
  [    0.060669] x23: 0000000000000001 x22: ffffdca01ea9a3c0 
  [    0.060671] x19: ffffdca01ecca000 
  [    0.060675] x18: ffffdca01dc56a10 
  [    0.060680] x21: ffffdca01dda4970 x20: 0000000000000001 
  [    0.060684] x17: 00000000bc8dcec3 
  [    0.060687] x16: 00000000b1e1b9b5 
  [    0.060688] x19: ffffdca01ecca000 x18: ffffdca01dc56a10 
  [    0.060694] x17: 000000007e50fa5f 
  [    0.060694] x15: 0000000000000001 
  [    0.060695] x16: 000000009cd7320e 
  [    0.060696] x14: ffff74e6bd9c01c8 
  [    0.060699] x13: 0000000000000004 
  [    0.060701] x15: 0000000000000001 
  [    0.060702] x12: 0000000000000228 
  [    0.060703] x14: ffff74e6bd99f1c8 
  [    0.060705] x11: 0000000000000000 
  [    0.060711] x13: 0000000000000004 
  [    0.060712] x10: 0000000000000b00 
  [    0.060713] x12: 0000000000000228 
  [    0.060716] x11: 0000000000000000 
  [    0.060722] x9 : ffff80001012bd20 
  [    0.060723] x10: 0000000000000b00 
  [    0.060724] x8 : ffff74e6ba3c66e0 
  [    0.060726] x7 : 0000000000000000 x6 : ffffdca01d822000 
  [    0.060727] x9 : ffff8000100fbd20 
  [    0.060729] x8 : ffff74e6ba33a9e0 
  [    0.060729] x5 : 00000000c00fac30 
  [    0.060730] x4 : 0000000000000000 
  [    0.060731] x7 : 0000000000000000 
  [    0.060734] x6 : ffffdca01d822000 
  [    0.060735] x3 : 000000000000000b 
  [    0.060736] x2 : ffffdca01ecca508 
  [    0.060738] x5 : 00000000c00fac30 x4 : 0000000000000000 
  [    0.060740] x1 : 000000000000000b 
  [    0.060742] x0 : 000000000000000b 
  [    0.060746] x3 : 000000000000000b x2 : ffffdca01ecca508 
  [    0.060749] Call trace:
  [    0.060751] x1 : 000000000000000b 
  [    0.060753]  spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060755] x0 : 000000000000000b 
  [    0.060757]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
  [    0.060761]  multi_cpu_stop+0xac/0x188
  [    0.060762] Call trace:
  [    0.060763]  cpu_stopper_thread+0xe4/0x1a0
  [    0.060766]  spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060769]  smpboot_thread_fn+0x1a8/0x1d8
  [    0.060771]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
  [    0.060773]  kthread+0x114/0x118
  [    0.060775]  multi_cpu_stop+0xac/0x188
  [    0.060778]  ret_from_fork+0x10/0x18
  [    0.060779]  cpu_stopper_thread+0xe4/0x1a0
  [    0.060780] ---[ end trace 82b1638f0eea221b ]---
  [    0.060783]  smpboot_thread_fn+0x1a8/0x1d8
  [    0.060785]  kthread+0x114/0x118
  [    0.060787]  ret_from_fork+0x10/0x18
  [    0.060789] ---[ end trace 82b1638f0eea221c ]---
  [    0.060797] pstate: 20400085 (nzCv daIf +PAN -UAO)
  [    0.060799] pc : spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060800] lr : spectre_bhb_enable_mitigation+0x120/0x228
  [    0.060801] sp : ffff80001015bce0
  [    0.060802] x29: ffff80001015bce0 x28: 0000000000000002 
  [    0.060804] x27: ffff80001003bd10 x26: 0000000000000000 
  [    0.060805] x25: 0000000000000060 x24: 0000000000000000 
  [    0.060806] x23: 0000000000000001 x22: ffffdca01ea9a3c0 
  [    0.060807] x21: ffffdca01dda4970 x20: 0000000000000001 
  [    0.060808] x19: ffffdca01ecca000 x18: ffffdca01dc56a10 
  [    0.060809] x17: 000000002041ff62 x16: 0000000057377f7c 
  [    0.060811] x15: 0000000000000001 x14: ffff74e6bd9e11c8 
  [    0.060812] x13: 0000000000000004 x12: 0000000000000228 
  [    0.060813] x11: 0000000000000000 x10: 0000000000000000 
  [    0.060814] x9 : 0000000000000000 x8 : 0000000000000000 
  [    0.060815] x7 : ffff74e6bd9f5bc0 x6 : ffffdca01d822000 
  [    0.060816] x5 : 00000000c00fac30 x4 : 0000000000000000 
  [    0.060817] x3 : 000000000000000b x2 : ffffdca01ecca508 
  [    0.060818] x1 : 000000000000000b x0 : 000000000000000b 
  [    0.060820] Call trace:
  [    0.060822]  spectre_bhb_enable_mitigation+0x148/0x228
  [    0.060823]  cpu_enable_non_boot_scope_capabilities+0x6c/0xa8
  [    0.060826]  multi_cpu_stop+0xac/0x188
  [    0.060827]  cpu_stopper_thread+0xe4/0x1a0
  [    0.060829]  smpboot_thread_fn+0x1a8/0x1d8
  [    0.060830]  kthread+0x114/0x118
  [    0.060832]  ret_from_fork+0x10/0x18
  [    0.060833] ---[ end trace 82b1638f0eea221d ]---

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