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[ 41.278185][ T1] rcu: Max phase no-delay instances is 1000. [ 41.280772][ T1] dyndbg: di.num_sites:19313 != di.num_descs:14485 [ 41.281332][ T1] BUG: kernel NULL pointer dereference, address: 00000000 [ 41.282179][ T1] #PF: supervisor read access in kernel mode [ 41.282886][ T1] #PF: error_code(0x0000) - not-present page [ 41.283602][ T1] *pde = 00000000 [ 41.284063][ T1] Oops: 0000 [#1] PREEMPT SMP [ 41.284649][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc3-00035-g4800de5cd505 #1 f8475d0cc4ef27da86708ed4446a0eaec1ab739e [ 41.285183][ T1] EIP: strcmp (arch/x86/lib/string_32.c:100) [ 41.285183][ T1] Code: 8b 75 f8 89 d8 8b 5d f4 8b 7d fc 89 ec 5d 31 d2 31 c9 e9 de bf 04 00 66 90 55 89 e5 83 ec 08 89 75 f8 89 c6 89 7d fc 89 d7 ac 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 8b 75 f8 8b 7d fc 89 All code ======== 0: 8b 75 f8 mov -0x8(%rbp),%esi 3: 89 d8 mov %ebx,%eax 5: 8b 5d f4 mov -0xc(%rbp),%ebx 8: 8b 7d fc mov -0x4(%rbp),%edi b: 89 ec mov %ebp,%esp d: 5d pop %rbp e: 31 d2 xor %edx,%edx 10: 31 c9 xor %ecx,%ecx 12: e9 de bf 04 00 jmp 0x4bff5 17: 66 90 xchg %ax,%ax 19: 55 push %rbp 1a: 89 e5 mov %esp,%ebp 1c: 83 ec 08 sub $0x8,%esp 1f: 89 75 f8 mov %esi,-0x8(%rbp) 22: 89 c6 mov %eax,%esi 24: 89 7d fc mov %edi,-0x4(%rbp) 27: 89 d7 mov %edx,%edi 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: 8b 75 f8 mov -0x8(%rbp),%esi 3c: 8b 7d fc mov -0x4(%rbp),%edi 3f: 89 .byte 0x89 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: 8b 75 f8 mov -0x8(%rbp),%esi 12: 8b 7d fc mov -0x4(%rbp),%edi 15: 89 .byte 0x89 [ 41.285183][ T1] EAX: d1ad926d EBX: d2297504 ECX: 00000000 EDX: 00000000 [ 41.285183][ T1] ESI: d1ad92f2 EDI: 00000000 EBP: c0287e8c ESP: c0287e84 [ 41.285183][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010286 [ 41.285183][ T1] CR0: 80050033 CR2: 00000000 CR3: 125a9000 CR4: 00040690 [ 41.285183][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 41.285183][ T1] DR6: fffe0ff0 DR7: 00000400 [ 41.285183][ T1] Call Trace: [ 41.285183][ T1] ? show_regs (arch/x86/kernel/dumpstack.c:479) [ 41.285183][ T1] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 41.285183][ T1] ? oops_enter (kernel/panic.c:567 kernel/panic.c:625) [ 41.285183][ T1] ? page_fault_oops (arch/x86/mm/fault.c:707) [ 41.285183][ T1] ? kernelmode_fixup_or_oops+0xa0/0x108 [ 41.285183][ T1] ? __bad_area_nosemaphore+0x147/0x278 [ 41.285183][ T1] ? bad_area_nosemaphore (arch/x86/mm/fault.c:867) [ 41.285183][ T1] ? do_user_addr_fault (arch/x86/mm/fault.c:1476) [ 41.285183][ T1] ? rcu_is_watching (kernel/rcu/tree.c:702 (discriminator 1)) [ 41.285183][ T1] ? exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1513 arch/x86/mm/fault.c:1561) [ 41.285183][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 41.285183][ T1] ? handle_exception (arch/x86/entry/entry_32.S:1049) [ 41.285183][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 41.285183][ T1] ? strcmp (arch/x86/lib/string_32.c:100) [ 41.285183][ T1] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 41.285183][ T1] ? strcmp (arch/x86/lib/string_32.c:100) [ 41.285183][ T1] dynamic_debug_init (lib/dynamic_debug.c:1698) [ 41.285183][ T1] ? dynamic_debug_init_control (lib/dynamic_debug.c:1666) [ 41.285183][ T1] ? rest_init (init/main.c:1429) [ 41.285183][ T1] do_one_initcall (init/main.c:1232) [ 41.285183][ T1] ? call_rcu_tasks_generic (include/linux/rcupdate.h:780 kernel/rcu/tasks.h:377) [ 41.285183][ T1] ? rest_init (init/main.c:1429) [ 41.285183][ T1] kernel_init_freeable (init/main.c:1337 init/main.c:1537) [ 41.285183][ T1] kernel_init (init/main.c:1439) [ 41.285183][ T1] ? schedule_tail (kernel/sched/core.c:5318) [ 41.285183][ T1] ret_from_fork (arch/x86/kernel/process.c:153) [ 41.285183][ T1] ? rest_init (init/main.c:1429) [ 41.285183][ T1] ret_from_fork_asm (arch/x86/entry/entry_32.S:741) [ 41.285183][ T1] entry_INT80_32 (arch/x86/entry/entry_32.S:947) [ 41.285183][ T1] Modules linked in: [ 41.285183][ T1] CR2: 0000000000000000 [ 41.285183][ T1] ---[ end trace 0000000000000000 ]--- [ 41.285183][ T1] EIP: strcmp (arch/x86/lib/string_32.c:100) [ 41.285183][ T1] Code: 8b 75 f8 89 d8 8b 5d f4 8b 7d fc 89 ec 5d 31 d2 31 c9 e9 de bf 04 00 66 90 55 89 e5 83 ec 08 89 75 f8 89 c6 89 7d fc 89 d7 ac 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 8b 75 f8 8b 7d fc 89 All code ======== 0: 8b 75 f8 mov -0x8(%rbp),%esi 3: 89 d8 mov %ebx,%eax 5: 8b 5d f4 mov -0xc(%rbp),%ebx 8: 8b 7d fc mov -0x4(%rbp),%edi b: 89 ec mov %ebp,%esp d: 5d pop %rbp e: 31 d2 xor %edx,%edx 10: 31 c9 xor %ecx,%ecx 12: e9 de bf 04 00 jmp 0x4bff5 17: 66 90 xchg %ax,%ax 19: 55 push %rbp 1a: 89 e5 mov %esp,%ebp 1c: 83 ec 08 sub $0x8,%esp 1f: 89 75 f8 mov %esi,-0x8(%rbp) 22: 89 c6 mov %eax,%esi 24: 89 7d fc mov %edi,-0x4(%rbp) 27: 89 d7 mov %edx,%edi 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: 8b 75 f8 mov -0x8(%rbp),%esi 3c: 8b 7d fc mov -0x4(%rbp),%edi 3f: 89 .byte 0x89 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: 8b 75 f8 mov -0x8(%rbp),%esi 12: 8b 7d fc mov -0x4(%rbp),%edi 15: 89 .byte 0x89 we also observed parent crash at the same position like below: [ 1.513152][ T1] signal: max sigframe size: 1760 [ 1.514116][ T1] rcu: Hierarchical SRCU implementation. [ 1.514840][ T1] rcu: Max phase no-delay instances is 1000. [ 1.517930][ T1] ------------[ cut here ]------------ [ 1.518640][ T1] kernel BUG at lib/dynamic_debug.c:1670! [ 1.519453][ T1] invalid opcode: 0000 [#1] PREEMPT SMP [ 1.520200][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.6.0-rc3-00034-g865080844494 #1 cb7bf5f3075e829952fe3d71614b0ccb0a823c5f [ 1.521100][ T1] EIP: dynamic_debug_init+0x2e0/0x330 [ 1.521100][ T1] Code: ff e9 da fe ff ff 8d 74 26 00 c7 04 24 d4 86 8d cd e8 50 e0 b9 fc 8b 45 b8 83 c4 54 5b 5e 5f 5d 31 d2 31 c9 e9 e5 de 6a fe 90 <0f> 0b b8 80 64 ff cd e8 f0 ae 1c fd c7 04 24 10 87 8d cd e8 24 e0 [ 1.521100][ T1] EAX: 555594bd EBX: ce375a60 ECX: 0000000b EDX: 00002f8e [ 1.521100][ T1] ESI: cca11134 EDI: 00000003 EBP: c0287ef4 ESP: c0287e94 [ 1.521100][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010287 [ 1.521100][ T1] CR0: 80050033 CR2: ffd38000 CR3: 0e589000 CR4: 00040690 [ 1.521100][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 1.521100][ T1] DR6: fffe0ff0 DR7: 00000400 [ 1.521100][ T1] Call Trace: [ 1.521100][ T1] ? show_regs+0x82/0x94 [ 1.521100][ T1] ? die+0x2f/0x9c [ 1.521100][ T1] ? atomic_notifier_call_chain+0x7f/0x114 [ 1.521100][ T1] ? do_trap+0x95/0x124 [ 1.521100][ T1] ? do_error_trap+0x6c/0x108 [ 1.521100][ T1] ? dynamic_debug_init+0x2e0/0x330 [ 1.521100][ T1] ? rest_init+0x184/0x184 [ 1.521100][ T1] ? exc_overflow+0x5c/0x5c [ 1.521100][ T1] ? exc_invalid_op+0x68/0x84 [ 1.521100][ T1] ? dynamic_debug_init+0x2e0/0x330 [ 1.521100][ T1] ? dynamic_debug_init_control+0x94/0x94 [ 1.521100][ T1] ? handle_exception+0x11e/0x11e [ 1.521100][ T1] ? dynamic_debug_init_control+0x94/0x94 [ 1.521100][ T1] ? rest_init+0x184/0x184 [ 1.521100][ T1] ? exc_overflow+0x5c/0x5c [ 1.521100][ T1] ? dynamic_debug_init+0x2e0/0x330 [ 1.521100][ T1] ? exc_overflow+0x5c/0x5c [ 1.521100][ T1] ? dynamic_debug_init+0x2e0/0x330 [ 1.521100][ T1] ? dynamic_debug_init_control+0x94/0x94 [ 1.521100][ T1] ? rest_init+0x184/0x184 [ 1.521100][ T1] do_one_initcall+0x69/0x3a4 [ 1.521100][ T1] ? call_rcu_tasks_generic+0x199/0x3d8 [ 1.521100][ T1] ? rest_init+0x184/0x184 [ 1.521100][ T1] kernel_init_freeable+0x9c/0x1c0 [ 1.521100][ T1] kernel_init+0x15/0x1dc [ 1.521100][ T1] ? schedule_tail+0x50/0x6c [ 1.521100][ T1] ret_from_fork+0x40/0x4c [ 1.521100][ T1] ? rest_init+0x184/0x184 [ 1.521100][ T1] ret_from_fork_asm+0x12/0x1c [ 1.521100][ T1] entry_INT80_32+0x10d/0x10d [ 1.521100][ T1] Modules linked in: [ 1.521139][ T1] ---[ end trace 0000000000000000 ]--- [ 1.521830][ T1] EIP: dynamic_debug_init+0x2e0/0x330 [ 1.522518][ T1] Code: ff e9 da fe ff ff 8d 74 26 00 c7 04 24 d4 86 8d cd e8 50 e0 b9 fc 8b 45 b8 83 c4 54 5b 5e 5f 5d 31 d2 31 c9 e9 e5 de 6a fe 90 <0f> 0b b8 80 64 ff cd e8 f0 ae 1c fd c7 04 24 10 87 8d cd e8 24 e0 [ 1.525078][ T1] EAX: 555594bd EBX: ce375a60 ECX: 0000000b EDX: 00002f8e [ 1.525115][ T1] ESI: cca11134 EDI: 00000003 EBP: c0287ef4 ESP: c0287e94 [ 1.526091][ T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010287 [ 1.527087][ T1] CR0: 80050033 CR2: ffd38000 CR3: 0e589000 CR4: 00040690 [ 1.527984][ T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 1.528930][ T1] DR6: fffe0ff0 DR7: 00000400 [ 1.529104][ T1] Kernel panic - not syncing: Fatal exception FYI. The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20231009/202310090909.cb63dd5e-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki