On 11/26/15, Michael Ellerman <m...@ellerman.id.au> wrote: > On Thu, 2015-11-26 at 11:15 +0300, Denis Kirjanov wrote: >> On 11/26/15, Michael Ellerman <m...@ellerman.id.au> wrote: >> > On Tue, 2015-11-24 at 21:23 +0300, Denis Kirjanov wrote: >> > I can't get this to hit. >> > >> > I've got LOCKDEP=y, I've enabled the hcall tracepoints, and then I >> > offline >> > a cpu via sysfs. > >> I haven't tried it via sysfs. Could you share the command >> so I give a try to reproduce. > > Either manually: > > $ echo 0 > /sys/devices/system/cpuN/online > > Or using: > > $ ppc64_cpu --cores-on=1 > and/or > $ ppc64_cpu --smt=1
Ok, I hit the WARNING: (the tree is dirty since I'm investigating the networking csum failure with ipv6) config attached. [ 88.249496] =============================== [ 88.249499] [ INFO: suspicious RCU usage. ] [ 88.249502] 4.4.0-rc2-00011-gb4f8144-dirty #20 Tainted: G S [ 88.249503] ------------------------------- [ 88.249505] ./arch/powerpc/include/asm/trace.h:77 suspicious rcu_dereference_check() usage! [ 88.249506] other info that might help us debug this: [ 88.249508] RCU used illegally from offline CPU! rcu_scheduler_active = 1, debug_locks = 1 [ 88.249510] no locks held by swapper/15/0. [ 88.249511] stack backtrace: [ 88.249514] CPU: 15 PID: 0 Comm: swapper/15 Tainted: G S 4.4.0-rc2-00011-gb4f8144-dirty #20 [ 88.249516] Call Trace: [ 88.249525] [c0000005b76e38f0] [c00000000089cb00] .dump_stack+0x98/0xd4 (unreliable) [ 88.249529] [c0000005b76e3970] [c00000000010a458] .lockdep_rcu_suspicious+0x108/0x170 [ 88.249533] [c0000005b76e3a00] [c000000000069cd0] .__trace_hcall_entry+0x260/0x2b0 [ 88.249536] [c0000005b76e3ab0] [c00000000006a0ac] plpar_hcall_norets_trace+0x34/0x8c [ 88.249539] [c0000005b76e3b20] [c000000000067704] .icp_hv_set_cpu_priority+0x54/0xc0 [ 88.249542] [c0000005b76e3ba0] [c00000000006694c] .xics_teardown_cpu+0x5c/0xa0 [ 88.249545] [c0000005b76e3c20] [c0000000000745fc] .pseries_mach_cpu_die+0x6c/0x320 [ 88.249549] [c0000005b76e3cd0] [c0000000000438dc] .cpu_die+0x3c/0x60 [ 88.249552] [c0000005b76e3d40] [c000000000018398] .arch_cpu_idle_dead+0x28/0x40 [ 88.249555] [c0000005b76e3db0] [c0000000000ffa1c] .cpu_startup_entry+0x4fc/0x560 [ 88.249558] [c0000005b76e3ed0] [c000000000043638] .start_secondary+0x328/0x360 [ 88.249562] [c0000005b76e3f90] [c000000000008a6c] start_secondary_prolog+0x10/0x14 [ 88.249564] =============================== [ 88.249564] [ INFO: suspicious RCU usage. ] [ 88.249566] 4.4.0-rc2-00011-gb4f8144-dirty #20 Tainted: G S [ 88.249566] ------------------------------- [ 88.249568] ./arch/powerpc/include/asm/trace.h:77 suspicious rcu_dereference_check() usage! [ 88.249569] other info that might help us debug this: [ 88.249570] RCU used illegally from offline CPU! rcu_scheduler_active = 1, debug_locks = 1 [ 88.249571] no locks held by swapper/15/0. [ 88.249572] stack backtrace: [ 88.249574] CPU: 15 PID: 0 Comm: swapper/15 Tainted: G S 4.4.0-rc2-00011-gb4f8144-dirty #20 [ 88.249574] Call Trace: [ 88.249578] [c0000005b76e38f0] [c00000000089cb00] .dump_stack+0x98/0xd4 (unreliable) [ 88.249581] [c0000005b76e3970] [c00000000010a458] .lockdep_rcu_suspicious+0x108/0x170 [ 88.249584] [c0000005b76e3a00] [c000000000069d10] .__trace_hcall_entry+0x2a0/0x2b0 [ 88.249587] [c0000005b76e3ab0] [c00000000006a0ac] plpar_hcall_norets_trace+0x34/0x8c [ 88.249590] [c0000005b76e3b20] [c000000000067704] .icp_hv_set_cpu_priority+0x54/0xc0 [ 88.249593] [c0000005b76e3ba0] [c00000000006694c] .xics_teardown_cpu+0x5c/0xa0 [ 88.249596] [c0000005b76e3c20] [c0000000000745fc] .pseries_mach_cpu_die+0x6c/0x320 [ 88.249599] [c0000005b76e3cd0] [c0000000000438dc] .cpu_die+0x3c/0x60 [ 88.249602] [c0000005b76e3d40] [c000000000018398] .arch_cpu_idle_dead+0x28/0x40 [ 88.249605] [c0000005b76e3db0] [c0000000000ffa1c] .cpu_startup_entry+0x4fc/0x560 [ 88.249608] [c0000005b76e3ed0] [c000000000043638] .start_secondary+0x328/0x360 [ 88.249611] [c0000005b76e3f90] [c000000000008a6c] start_secondary_prolog+0x10/0x14 [ 88.249613] =============================== [ 88.249613] [ INFO: suspicious RCU usage. ] [ 88.249615] 4.4.0-rc2-00011-gb4f8144-dirty #20 Tainted: G S [ 88.249615] ------------------------------- [ 88.249617] ./arch/powerpc/include/asm/trace.h:99 suspicious rcu_dereference_check() usage! [ 88.249617] other info that might help us debug this: [ 88.249619] RCU used illegally from offline CPU! rcu_scheduler_active = 1, debug_locks = 1 [ 88.249620] no locks held by swapper/15/0. [ 88.249620] stack backtrace: [ 88.249622] CPU: 15 PID: 0 Comm: swapper/15 Tainted: G S 4.4.0-rc2-00011-gb4f8144-dirty #20 [ 88.249623] Call Trace: [ 88.249626] [c0000005b76e38e0] [c00000000089cb00] .dump_stack+0x98/0xd4 (unreliable) [ 88.249629] [c0000005b76e3960] [c00000000010a458] .lockdep_rcu_suspicious+0x108/0x170 [ 88.249632] [c0000005b76e39f0] [c000000000069f90] .__trace_hcall_exit+0x270/0x2c0 [ 88.249635] [c0000005b76e3ab0] [c00000000006a0e8] plpar_hcall_norets_trace+0x70/0x8c [ 88.249638] [c0000005b76e3b20] [c000000000067704] .icp_hv_set_cpu_priority+0x54/0xc0 [ 88.249641] [c0000005b76e3ba0] [c00000000006694c] .xics_teardown_cpu+0x5c/0xa0 [ 88.249644] [c0000005b76e3c20] [c0000000000745fc] .pseries_mach_cpu_die+0x6c/0x320 [ 88.249647] [c0000005b76e3cd0] [c0000000000438dc] .cpu_die+0x3c/0x60 [ 88.249650] [c0000005b76e3d40] [c000000000018398] .arch_cpu_idle_dead+0x28/0x40 [ 88.249653] [c0000005b76e3db0] [c0000000000ffa1c] .cpu_startup_entry+0x4fc/0x560 [ 88.249656] [c0000005b76e3ed0] [c000000000043638] .start_secondary+0x328/0x360 [ 88.249659] [c0000005b76e3f90] [c000000000008a6c] start_secondary_prolog+0x10/0x14 [ 88.249660] =============================== [ 88.249661] [ INFO: suspicious RCU usage. ] [ 88.249662] 4.4.0-rc2-00011-gb4f8144-dirty #20 Tainted: G S [ 88.249663] ------------------------------- [ 88.249664] ./arch/powerpc/include/asm/trace.h:99 suspicious rcu_dereference_check() usage! [ 88.249665] other info that might help us debug this: [ 88.249666] RCU used illegally from offline CPU! rcu_scheduler_active = 1, debug_locks = 1 [ 88.249667] no locks held by swapper/15/0. [ 88.249668] stack backtrace: [ 88.249670] CPU: 15 PID: 0 Comm: swapper/15 Tainted: G S 4.4.0-rc2-00011-gb4f8144-dirty #20 [ 88.249670] Call Trace: [ 88.249673] [c0000005b76e38e0] [c00000000089cb00] .dump_stack+0x98/0xd4 (unreliable) [ 88.249677] [c0000005b76e3960] [c00000000010a458] .lockdep_rcu_suspicious+0x108/0x170 [ 88.249680] [c0000005b76e39f0] [c000000000069fd0] .__trace_hcall_exit+0x2b0/0x2c0 [ 88.249682] [c0000005b76e3ab0] [c00000000006a0e8] plpar_hcall_norets_trace+0x70/0x8c [ 88.249686] [c0000005b76e3b20] [c000000000067704] .icp_hv_set_cpu_priority+0x54/0xc0 [ 88.249689] [c0000005b76e3ba0] [c00000000006694c] .xics_teardown_cpu+0x5c/0xa0 [ 88.249691] [c0000005b76e3c20] [c0000000000745fc] .pseries_mach_cpu_die+0x6c/0x320 [ 88.249694] [c0000005b76e3cd0] [c0000000000438dc] .cpu_die+0x3c/0x60 [ 88.249697] [c0000005b76e3d40] [c000000000018398] .arch_cpu_idle_dead+0x28/0x40 [ 88.249700] [c0000005b76e3db0] [c0000000000ffa1c] .cpu_startup_entry+0x4fc/0x560 [ 88.249703] [c0000005b76e3ed0] [c000000000043638] .start_secondary+0x328/0x360 [ 88.249706] [c0000005b76e3f90] [c000000000008a6c] start_secondary_prolog+0x10/0x14 ps700_1 src # > > Which uses sysfs. > > cheers > >
config
Description: Binary data
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