* [brauner-github:namespace-6.18.file_handles] [ipc] c8e087bf68: BUG:kernel_NULL_pointer_dereference,address
@ 2025-09-24 7:33 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2025-09-24 7:33 UTC (permalink / raw)
To: Christian Brauner; +Cc: oe-lkp, lkp, Christian Brauner, oliver.sang
Hello,
kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on:
commit: c8e087bf689c357017d4fbded9123dcf07ce14ba ("ipc: support ns lookup")
https://github.com/brauner/linux.git namespace-6.18.file_handles
in testcase: boot
config: x86_64-randconfig-072-20250919
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)
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.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202509231700.dff6cd4d-lkp@intel.com
[ 2.190097][ T1] BUG: kernel NULL pointer dereference, address: 0000000000000028
[ 2.190097][ T1] #PF: supervisor read access in kernel mode
[ 2.190097][ T1] #PF: error_code(0x0000) - not-present page
[ 2.190097][ T1] PGD 0 P4D 0
[ 2.190097][ T1] Oops: Oops: 0000 [#1] SMP
[ 2.190097][ T1] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Tainted: G T 6.17.0-rc4-00022-gc8e087bf689c #1 VOLUNTARY c1f65eaef97961d661159ea096bfaf3ec3497462
[ 2.190097][ T1] Tainted: [T]=RANDSTRUCT
[ 2.190097][ T1] RIP: 0010:__ns_tree_add_raw (kernel/nstree.c:95)
[ 2.190097][ T1] Code: 48 89 7c 24 10 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 48 89 44 24 08 50 e8 d0 bb 04 00 48 83 c4 08 ff 43 18 49 8b 47 08 <8b> 68 28 44 8b b3 90 00 00 00 89 ef 44 89 f6 e8 f1 5d 13 00 44 39
All code
========
0: 48 89 7c 24 10 mov %rdi,0x10(%rsp)
5: 31 f6 xor %esi,%esi
7: 31 d2 xor %edx,%edx
9: 31 c9 xor %ecx,%ecx
b: 41 b8 01 00 00 00 mov $0x1,%r8d
11: 45 31 c9 xor %r9d,%r9d
14: 48 89 44 24 08 mov %rax,0x8(%rsp)
19: 50 push %rax
1a: e8 d0 bb 04 00 call 0x4bbef
1f: 48 83 c4 08 add $0x8,%rsp
23: ff 43 18 incl 0x18(%rbx)
26: 49 8b 47 08 mov 0x8(%r15),%rax
2a:* 8b 68 28 mov 0x28(%rax),%ebp <-- trapping instruction
2d: 44 8b b3 90 00 00 00 mov 0x90(%rbx),%r14d
34: 89 ef mov %ebp,%edi
36: 44 89 f6 mov %r14d,%esi
39: e8 f1 5d 13 00 call 0x135e2f
3e: 44 rex.R
3f: 39 .byte 0x39
Code starting with the faulting instruction
===========================================
0: 8b 68 28 mov 0x28(%rax),%ebp
3: 44 8b b3 90 00 00 00 mov 0x90(%rbx),%r14d
a: 89 ef mov %ebp,%edi
c: 44 89 f6 mov %r14d,%esi
f: e8 f1 5d 13 00 call 0x135e05
14: 44 rex.R
15: 39 .byte 0x39
[ 2.190097][ T1] RSP: 0000:ffffc90000013b00 EFLAGS: 00010202
[ 2.190097][ T1] RAX: 0000000000000000 RBX: ffffffff83c43ae0 RCX: ffffffff85362b01
[ 2.190097][ T1] RDX: ffffffff84f75101 RSI: ffffffff85762e18 RDI: ffffffff85762e18
[ 2.190097][ T1] RBP: ffffc90000013e48 R08: 0000000000000008 R09: ffffffff85362bf0
[ 2.190097][ T1] R10: 000000005fbdd200 R11: 00000000c67180d1 R12: 0000000000000002
[ 2.190097][ T1] R13: 0000000000000246 R14: 0000000000001002 R15: ffffffff841094e0
[ 2.190097][ T1] FS: 0000000000000000(0000) GS:ffff8884aaed7000(0000) knlGS:0000000000000000
[ 2.190097][ T1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.190097][ T1] CR2: 0000000000000028 CR3: 0000000003c24000 CR4: 00000000000406f0
[ 2.190097][ T1] Call Trace:
[ 2.190097][ T1] <TASK>
[ 2.190097][ T1] ? ipc_ns_init (ipc/shm.c:153)
[ 2.190097][ T1] ? __cfi_ipc_ns_init (ipc/shm.c:150)
[ 2.190097][ T1] ipc_ns_init (ipc/shm.c:153)
[ 2.190097][ T1] do_one_initcall (init/main.c:1269)
[ 2.190097][ T1] ? __lock_acquire (kernel/locking/lockdep.c:4674)
[ 2.190097][ T1] ? next_arg (lib/cmdline.c:273)
[ 2.190097][ T1] ? parameq (kernel/params.c:91)
[ 2.190097][ T1] ? __sanitizer_cov_trace_switch (kernel/kcov.c:350)
[ 2.190097][ T1] ? parse_args (kernel/params.c:?)
[ 2.190097][ T1] do_initcall_level (init/main.c:1330)
[ 2.190097][ T1] do_initcalls (init/main.c:1344)
[ 2.190097][ T1] ? kernel_init (init/main.c:1471)
[ 2.190097][ T1] kernel_init_freeable (init/main.c:1581)
[ 2.190097][ T1] ? __cfi_kernel_init (init/main.c:1461)
[ 2.190097][ T1] kernel_init (init/main.c:1471)
[ 2.190097][ T1] ret_from_fork (arch/x86/kernel/process.c:154)
[ 2.190097][ T1] ? __cfi_kernel_init (init/main.c:1461)
[ 2.190097][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
[ 2.190097][ T1] </TASK>
[ 2.190097][ T1] Modules linked in:
[ 2.190097][ T1] CR2: 0000000000000028
[ 2.190097][ T1] ---[ end trace 0000000000000000 ]---
[ 2.190097][ T1] RIP: 0010:__ns_tree_add_raw (kernel/nstree.c:95)
[ 2.190097][ T1] Code: 48 89 7c 24 10 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 48 89 44 24 08 50 e8 d0 bb 04 00 48 83 c4 08 ff 43 18 49 8b 47 08 <8b> 68 28 44 8b b3 90 00 00 00 89 ef 44 89 f6 e8 f1 5d 13 00 44 39
All code
========
0: 48 89 7c 24 10 mov %rdi,0x10(%rsp)
5: 31 f6 xor %esi,%esi
7: 31 d2 xor %edx,%edx
9: 31 c9 xor %ecx,%ecx
b: 41 b8 01 00 00 00 mov $0x1,%r8d
11: 45 31 c9 xor %r9d,%r9d
14: 48 89 44 24 08 mov %rax,0x8(%rsp)
19: 50 push %rax
1a: e8 d0 bb 04 00 call 0x4bbef
1f: 48 83 c4 08 add $0x8,%rsp
23: ff 43 18 incl 0x18(%rbx)
26: 49 8b 47 08 mov 0x8(%r15),%rax
2a:* 8b 68 28 mov 0x28(%rax),%ebp <-- trapping instruction
2d: 44 8b b3 90 00 00 00 mov 0x90(%rbx),%r14d
34: 89 ef mov %ebp,%edi
36: 44 89 f6 mov %r14d,%esi
39: e8 f1 5d 13 00 call 0x135e2f
3e: 44 rex.R
3f: 39 .byte 0x39
Code starting with the faulting instruction
===========================================
0: 8b 68 28 mov 0x28(%rax),%ebp
3: 44 8b b3 90 00 00 00 mov 0x90(%rbx),%r14d
a: 89 ef mov %ebp,%edi
c: 44 89 f6 mov %r14d,%esi
f: e8 f1 5d 13 00 call 0x135e05
14: 44 rex.R
15: 39 .byte 0x39
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250923/202509231700.dff6cd4d-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2025-09-24 7:33 [brauner-github:namespace-6.18.file_handles] [ipc] c8e087bf68: BUG:kernel_NULL_pointer_dereference,address kernel test robot
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