Hello,
kernel test robot noticed "kernel_BUG_at_include/linux/page-flags.h" on:
commit: 8268af309d07d1c6279080b4e6fd16ec75cc977c ("arch, mm: set max_mapnr when
allocating memory map for FLATMEM")
https://git.kernel.org/cgit/linux/kernel/git/akpm/mm.git mm-stable
in testcase: boot
config: i386-randconfig-062-20250319
compiler: clang-20
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+------------------------------------------+------------+------------+
| | d319c8b491 | 8268af309d |
+------------------------------------------+------------+------------+
| boot_successes | 6 | 0 |
| boot_failures | 0 | 6 |
| kernel_BUG_at_include/linux/page-flags.h | 0 | 6 |
| Oops:invalid_opcode:#[##]PREEMPT_SMP | 0 | 6 |
| EIP:reserve_bootmem_region | 0 | 6 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 6 |
+------------------------------------------+------------+------------+
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.s...@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202503241424.d16223ec-...@intel.com
[ 0.478410][ T0] ------------[ cut here ]------------
[ 0.478822][ T0] kernel BUG at include/linux/page-flags.h:536!
[ 0.479312][ T0] Oops: invalid opcode: 0000 [#1] PREEMPT SMP
[ 0.479768][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted
6.14.0-rc6-00357-g8268af309d07 #1
[ 0.480470][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 0.481260][ T0] EIP: reserve_bootmem_region (include/linux/page-flags.h:536)
[ 0.481683][ T0] Code: 5d c3 01 f1 89 c8 ba e1 38 f4 c3 e8 1e 37 8e fc 0f 0b b8
90 e2 62 c4 e8 e2 05 5e fc 01 f1 89 c8 ba be 85 f7 c3 e8 04 37 8e fc <0f> 0b b8
80 e2 62 c4 e8 c8 05 5e fc 55 89 e5 53 57 56 83 ec 10 89
All code
========
0: 5d pop %rbp
1: c3 ret
2: 01 f1 add %esi,%ecx
4: 89 c8 mov %ecx,%eax
6: ba e1 38 f4 c3 mov $0xc3f438e1,%edx
b: e8 1e 37 8e fc call 0xfffffffffc8e372e
10: 0f 0b ud2
12: b8 90 e2 62 c4 mov $0xc462e290,%eax
17: e8 e2 05 5e fc call 0xfffffffffc5e05fe
1c: 01 f1 add %esi,%ecx
1e: 89 c8 mov %ecx,%eax
20: ba be 85 f7 c3 mov $0xc3f785be,%edx
25: e8 04 37 8e fc call 0xfffffffffc8e372e
2a:* 0f 0b ud2 <-- trapping instruction
2c: b8 80 e2 62 c4 mov $0xc462e280,%eax
31: e8 c8 05 5e fc call 0xfffffffffc5e05fe
36: 55 push %rbp
37: 89 e5 mov %esp,%ebp
39: 53 push %rbx
3a: 57 push %rdi
3b: 56 push %rsi
3c: 83 ec 10 sub $0x10,%esp
3f: 89 .byte 0x89
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: b8 80 e2 62 c4 mov $0xc462e280,%eax
7: e8 c8 05 5e fc call 0xfffffffffc5e05d4
c: 55 push %rbp
d: 89 e5 mov %esp,%ebp
f: 53 push %rbx
10: 57 push %rdi
11: 56 push %rsi
12: 83 ec 10 sub $0x10,%esp
15: 89 .byte 0x89
[ 0.483177][ T0] EAX: 00000000 EBX: c425df50 ECX: 00000000 EDX: 00000000
[ 0.483712][ T0] ESI: 017ffc00 EDI: ffffffff EBP: c425df34 ESP: c425df2c
[ 0.484248][ T0] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS:
00210046
[ 0.484846][ T0] CR0: 80050033 CR2: 00000000 CR3: 04b48000 CR4: 00000090
[ 0.485376][ T0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 0.485907][ T0] DR6: fffe0ff0 DR7: 00000400
[ 0.486253][ T0] Call Trace:
[ 0.486494][ T0] ? __die_body (arch/x86/kernel/dumpstack.c:478)
[ 0.486822][ T0] ? die (arch/x86/kernel/dumpstack.c:?)
[ 0.487099][ T0] ? do_trap (arch/x86/kernel/traps.c:?
arch/x86/kernel/traps.c:197)
[ 0.487409][ T0] ? do_error_trap (arch/x86/kernel/traps.c:217)
[ 0.487752][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536)
[ 0.488153][ T0] ? exc_overflow (arch/x86/kernel/traps.c:301)
[ 0.488490][ T0] ? handle_invalid_op (arch/x86/kernel/traps.c:254)
[ 0.488869][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536)
[ 0.489271][ T0] ? exc_invalid_op (arch/x86/kernel/traps.c:316)
[ 0.489619][ T0] ? handle_exception (arch/x86/entry/entry_32.S:1055)
[ 0.489996][ T0] ? exc_overflow (arch/x86/kernel/traps.c:301)
[ 0.490332][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536)
[ 0.490733][ T0] ? exc_overflow (arch/x86/kernel/traps.c:301)
[ 0.491068][ T0] ? reserve_bootmem_region (include/linux/page-flags.h:536)
[ 0.491470][ T0] memmap_init_reserved_pages (mm/memblock.c:2203)
[ 0.491887][ T0] free_low_memory_core_early (mm/memblock.c:?)
[ 0.492302][ T0] memblock_free_all (mm/memblock.c:2272
include/linux/atomic/atomic-arch-fallback.h:546
include/linux/atomic/atomic-long.h:123
include/linux/atomic/atomic-instrumented.h:3261 include/linux/mm.h:67
mm/memblock.c:2273)
[ 0.492659][ T0] mem_init (arch/x86/mm/init_32.c:735)
[ 0.492952][ T0] mm_core_init (mm/mm_init.c:2730)
[ 0.493271][ T0] start_kernel (init/main.c:958)
[ 0.493604][ T0] i386_start_kernel (arch/x86/kernel/head32.c:79)
[ 0.493969][ T0] startup_32_smp (arch/x86/kernel/head_32.S:292)
[ 0.494317][ T0] Modules linked in:
[ 0.494604][ T0] ---[ end trace 0000000000000000 ]---
[ 0.495009][ T0] EIP: reserve_bootmem_region (include/linux/page-flags.h:536)
[ 0.495422][ T0] Code: 5d c3 01 f1 89 c8 ba e1 38 f4 c3 e8 1e 37 8e fc 0f 0b b8
90 e2 62 c4 e8 e2 05 5e fc 01 f1 89 c8 ba be 85 f7 c3 e8 04 37 8e fc <0f> 0b b8
80 e2 62 c4 e8 c8 05 5e fc 55 89 e5 53 57 56 83 ec 10 89
All code
========
0: 5d pop %rbp
1: c3 ret
2: 01 f1 add %esi,%ecx
4: 89 c8 mov %ecx,%eax
6: ba e1 38 f4 c3 mov $0xc3f438e1,%edx
b: e8 1e 37 8e fc call 0xfffffffffc8e372e
10: 0f 0b ud2
12: b8 90 e2 62 c4 mov $0xc462e290,%eax
17: e8 e2 05 5e fc call 0xfffffffffc5e05fe
1c: 01 f1 add %esi,%ecx
1e: 89 c8 mov %ecx,%eax
20: ba be 85 f7 c3 mov $0xc3f785be,%edx
25: e8 04 37 8e fc call 0xfffffffffc8e372e
2a:* 0f 0b ud2 <-- trapping instruction
2c: b8 80 e2 62 c4 mov $0xc462e280,%eax
31: e8 c8 05 5e fc call 0xfffffffffc5e05fe
36: 55 push %rbp
37: 89 e5 mov %esp,%ebp
39: 53 push %rbx
3a: 57 push %rdi
3b: 56 push %rsi
3c: 83 ec 10 sub $0x10,%esp
3f: 89 .byte 0x89
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: b8 80 e2 62 c4 mov $0xc462e280,%eax
7: e8 c8 05 5e fc call 0xfffffffffc5e05d4
c: 55 push %rbp
d: 89 e5 mov %esp,%ebp
f: 53 push %rbx
10: 57 push %rdi
11: 56 push %rsi
12: 83 ec 10 sub $0x10,%esp
15: 89 .byte 0x89
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250324/202503241424.d16223ec-...@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
