* [jimc:dd-ratelimit] [dyndbg] b65e77782e: BUG:kernel_NULL_pointer_dereference,address
@ 2026-07-10 1:31 kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-07-10 1:31 UTC (permalink / raw)
To: Jim Cromie, Łukasz Bartosik; +Cc: oe-lkp, lkp, oliver.sang
Hello,
kernel test robot noticed "BUG:kernel_NULL_pointer_dereference,address" on:
commit: b65e77782ef0e657869ec5093935ffdda0cb4b28 ("dyndbg: consolidate site ranges")
https://github.com/jimc/linux.git dd-ratelimit
in testcase: boot
config: i386-randconfig-011-20260706
compiler: gcc-14
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G
(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/202607091658.e03b7a5b-lkp@intel.com
[ 7.855146][ T112] BUG: kernel NULL pointer dereference, address: 00000000
[ 7.857470][ T112] #PF: supervisor read access in kernel mode
[ 7.859313][ T112] #PF: error_code(0x0000) - not-present page
[ 7.861248][ T112] *pde = 00000000
[ 7.862470][ T112] Oops: Oops: 0000 [#1] SMP
[ 7.863891][ T112] CPU: 0 UID: 0 PID: 112 Comm: systemd-udevd Tainted: G W 7.2.0-rc1-00062-gb65e77782ef0 #1 PREEMPT(lazy) d791b41899d215960b78e1ce16355c682d1dd07f
[ 7.868778][ T112] Tainted: [W]=WARN
[ 7.869984][ T112] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 7.872988][ T112] EIP: strcmp+0xa/0x20
[ 7.874870][ T112] Code: 31 c0 83 c9 ff f2 ae 4f 8b 4d f0 49 78 06 ac aa 84 c0 75 f7 31 c0 aa 5e 89 d8 5b 5e 5f 5d c3 90 55 89 e5 57 56 89 d7 89 c6 ac <ae> 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 5e 5f 5d c3 8d 76 00
All code
========
0: 31 c0 xor %eax,%eax
2: 83 c9 ff or $0xffffffff,%ecx
5: f2 ae repnz scas %es:(%rdi),%al
7: 4f 8b 4d f0 rex.WRXB mov -0x10(%r13),%r9
b: 49 78 06 rex.WB js 0x14
e: ac lods %ds:(%rsi),%al
f: aa stos %al,%es:(%rdi)
10: 84 c0 test %al,%al
12: 75 f7 jne 0xb
14: 31 c0 xor %eax,%eax
16: aa stos %al,%es:(%rdi)
17: 5e pop %rsi
18: 89 d8 mov %ebx,%eax
1a: 5b pop %rbx
1b: 5e pop %rsi
1c: 5f pop %rdi
1d: 5d pop %rbp
1e: c3 ret
1f: 90 nop
20: 55 push %rbp
21: 89 e5 mov %esp,%ebp
23: 57 push %rdi
24: 56 push %rsi
25: 89 d7 mov %edx,%edi
27: 89 c6 mov %eax,%esi
29: ac lods %ds:(%rsi),%al
2a:* ae scas %es:(%rdi),%al <-- trapping instruction
2b: 75 08 jne 0x35
2d: 84 c0 test %al,%al
2f: 75 f8 jne 0x29
31: 31 c0 xor %eax,%eax
33: eb 04 jmp 0x39
35: 19 c0 sbb %eax,%eax
37: 0c 01 or $0x1,%al
39: 5e pop %rsi
3a: 5f pop %rdi
3b: 5d pop %rbp
3c: c3 ret
3d: 8d 76 00 lea 0x0(%rsi),%esi
Code starting with the faulting instruction
===========================================
0: ae scas %es:(%rdi),%al
1: 75 08 jne 0xb
3: 84 c0 test %al,%al
5: 75 f8 jne 0xffffffffffffffff
7: 31 c0 xor %eax,%eax
9: eb 04 jmp 0xf
b: 19 c0 sbb %eax,%eax
d: 0c 01 or $0x1,%al
f: 5e pop %rsi
10: 5f pop %rdi
11: 5d pop %rbp
12: c3 ret
13: 8d 76 00 lea 0x0(%rsi),%esi
[ 7.878857][ T112] EAX: f78a2071 EBX: 4161ebf0 ECX: f78ab00c EDX: 00000000
[ 7.880299][ T112] ESI: f78a2009 EDI: 00000000 EBP: 57fd1b24 ESP: 57fd1b1c
[ 7.881734][ T112] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00210282
[ 7.883357][ T112] CR0: 80050033 CR2: 00000000 CR3: 17fb6000 CR4: 00040690
[ 7.884788][ T112] Call Trace:
[ 7.885500][ T112] ? ddebug_grow_tree+0x9a/0x110
[ 7.886521][ T112] ? ddebug_condense_sites+0x68/0xe0
[ 7.887595][ T112] ? ddebug_get_filename+0x10/0x10
[ 7.888640][ T112] ? ddebug_get_function+0x10/0x10
[ 7.890488][ T112] ? ddebug_proc_next+0x40/0x40
[ 7.891513][ T112] ? ddebug_add_module+0x85/0x500
[ 7.892553][ T112] ? preempt_count_add+0x51/0x60
[ 7.893587][ T112] ? __mutex_unlock_slowpath+0x2de/0x300
[ 7.894736][ T112] ? mutex_unlock+0xb/0x10
[ 7.895651][ T112] ? ddebug_add_module+0x500/0x500
[ 7.896723][ T112] ? ddebug_module_notify+0x41/0xd0
[ 7.897798][ T112] ? notifier_call_chain+0xc7/0xf0
[ 7.898847][ T112] ? notifier_call_chain_robust+0x20/0x50
[ 7.900036][ T112] ? blocking_notifier_call_chain_robust+0x31/0x50
[ 7.901380][ T112] ? load_module+0x496/0x6e0
[ 7.902353][ T112] ? init_module_from_file+0x78/0x80
[ 7.903440][ T112] ? __ia32_sys_finit_module+0x149/0x220
[ 7.904603][ T112] ? ia32_sys_call+0xccd/0x1110
[ 7.905619][ T112] ? do_int80_syscall_32+0x11a/0x260
[ 7.906713][ T112] ? lockdep_hardirqs_on+0xe0/0x110
[ 7.907776][ T112] ? do_int80_syscall_32+0x258/0x260
[ 7.908874][ T112] ? sched_clock_noinstr+0x8/0x10
[ 7.909925][ T112] ? __bpf_prog_run32+0x3a/0x50
[ 7.910947][ T112] ? __bpf_prog_run32+0x3a/0x50
[ 7.911962][ T112] ? debug_smp_processor_id+0x12/0x20
[ 7.913105][ T112] ? get_lock_stats+0x12/0x50
[ 7.914085][ T112] ? preempt_latency_start+0x1f/0x50
[ 7.915184][ T112] ? preempt_count_add+0x51/0x60
[ 7.916212][ T112] ? seccomp_run_filters+0x285/0x2b0
[ 7.917317][ T112] ? debug_smp_processor_id+0x12/0x20
[ 7.918399][ T112] ? __seccomp_filter+0x9c/0x1f0
[ 7.919401][ T112] ? do_int80_syscall_32+0xd7/0x260
[ 7.920481][ T112] ? entry_INT80_32+0xf0/0xf0
[ 7.921480][ T112] Modules linked in: qemu_fw_cfg(+) intel_gtt agpgart autofs4
[ 7.923058][ T112] CR2: 0000000000000000
[ 7.924040][ T112] ---[ end trace 0000000000000000 ]---
[ OK ] Finished Coldplug All udev Devices.
[ OK ] Reached target System Initialization.
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260709/202607091658.e03b7a5b-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2026-07-10 1:31 [jimc:dd-ratelimit] [dyndbg] b65e77782e: BUG:kernel_NULL_pointer_dereference,address kernel test robot
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