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avoid using _ddebug.site with site_*() macros") https://github.com/jimc/linux.git dd-shrink-4 in testcase: boot compiler: gcc-13 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +---------------------------------------------------+------------+------------+ | | 4d0c4b32ef | d635e975dc | +---------------------------------------------------+------------+------------+ | BUG:kernel_NULL_pointer_dereference,address | 0 | 6 | | Oops:#[##] | 0 | 6 | | EIP:strcmp | 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 | Closes: https://lore.kernel.org/oe-lkp/202404302341.c696afcb-lkp@intel.com [ 238.612271][ T359] BUG: kernel NULL pointer dereference, address: 00000000 [ 238.612843][ T359] #PF: supervisor read access in kernel mode [ 238.613306][ T359] #PF: error_code(0x0000) - not-present page [ 238.613771][ T359] *pde = 00000000 [ 238.614093][ T359] Oops: 0000 [#1] SMP [ 238.614428][ T359] CPU: 0 PID: 359 Comm: modprobe Tainted: G W N 6.9.0-rc5-00045-gd635e975dc33 #1 cd26bf5796f45b52d1744ef978c49e829efea625 [ 238.615432][ T359] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 238.616214][ T359] EIP: strcmp (arch/x86/lib/string_32.c:100) [ 238.616582][ T359] Code: 31 c0 f2 ae 4f 89 d1 49 78 06 ac aa 84 c0 75 f7 31 c0 aa 89 d8 5b 5e 5f 5d 31 d2 31 c9 c3 8d 76 00 55 89 e5 57 89 d7 56 89 c6 ae 75 08 84 c0 75 f8 31 c0 eb 04 19 c0 0c 01 5e 5f 5d 31 d2 c3 All code ======== 0: 31 c0 xor %eax,%eax 2: f2 ae repnz scas %es:(%rdi),%al 4: 4f 89 d1 rex.WRXB mov %r10,%r9 7: 49 78 06 rex.WB js 0x10 a: ac lods %ds:(%rsi),%al b: aa stos %al,%es:(%rdi) c: 84 c0 test %al,%al e: 75 f7 jne 0x7 10: 31 c0 xor %eax,%eax 12: aa stos %al,%es:(%rdi) 13: 89 d8 mov %ebx,%eax 15: 5b pop %rbx 16: 5e pop %rsi 17: 5f pop %rdi 18: 5d pop %rbp 19: 31 d2 xor %edx,%edx 1b: 31 c9 xor %ecx,%ecx 1d: c3 ret 1e: 8d 76 00 lea 0x0(%rsi),%esi 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 57 push %rdi 25: 89 d7 mov %edx,%edi 27: 56 push %rsi 28: 89 c6 mov %eax,%esi 2a:* ac lods %ds:(%rsi),%al <-- trapping instruction 2b: ae scas %es:(%rdi),%al 2c: 75 08 jne 0x36 2e: 84 c0 test %al,%al 30: 75 f8 jne 0x2a 32: 31 c0 xor %eax,%eax 34: eb 04 jmp 0x3a 36: 19 c0 sbb %eax,%eax 38: 0c 01 or $0x1,%al 3a: 5e pop %rsi 3b: 5f pop %rdi 3c: 5d pop %rbp 3d: 31 d2 xor %edx,%edx 3f: c3 ret Code starting with the faulting instruction =========================================== 0: ac lods %ds:(%rsi),%al 1: ae scas %es:(%rdi),%al 2: 75 08 jne 0xc 4: 84 c0 test %al,%al 6: 75 f8 jne 0x0 8: 31 c0 xor %eax,%eax a: eb 04 jmp 0x10 c: 19 c0 sbb %eax,%eax e: 0c 01 or $0x1,%al 10: 5e pop %rsi 11: 5f pop %rdi 12: 5d pop %rbp 13: 31 d2 xor %edx,%edx 15: c3 ret [ 238.617972][ T359] EAX: 00000000 EBX: ef4a6a04 ECX: 00000000 EDX: ef4ec465 [ 238.618505][ T359] ESI: 00000000 EDI: ef4ec465 EBP: e9953dac ESP: e9953da4 [ 238.619034][ T359] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 EFLAGS: 00210246 [ 238.619642][ T359] CR0: 80050033 CR2: 00000000 CR3: 27071000 CR4: 00040690 [ 238.620169][ T359] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 238.620695][ T359] DR6: fffe0ff0 DR7: 00000400 [ 238.621071][ T359] Call Trace: [ 238.621364][ T359] ? show_regs (arch/x86/kernel/dumpstack.c:479) [ 238.621725][ T359] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 238.622053][ T359] ? page_fault_oops (arch/x86/mm/fault.c:713) [ 238.622445][ T359] ? kernelmode_fixup_or_oops+0x88/0xe8 [ 238.622946][ T359] ? __bad_area_nosemaphore+0x136/0x22c [ 238.623444][ T359] ? up_read (kernel/locking/rwsem.c:1623) [ 238.623788][ T359] ? lock_mm_and_find_vma (mm/memory.c:5706) [ 238.624218][ T359] ? bad_area_nosemaphore (arch/x86/mm/fault.c:864) [ 238.624623][ T359] ? do_user_addr_fault (arch/x86/mm/fault.c:1476) [ 238.625036][ T359] ? 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:1563) [ 238.625422][ T359] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 238.625891][ T359] ? handle_exception (arch/x86/entry/entry_32.S:1047) [ 238.626306][ T359] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 238.626781][ T359] ? strcmp (arch/x86/lib/string_32.c:100) [ 238.627112][ T359] ? pvclock_clocksource_read_nowd (arch/x86/mm/fault.c:1518) [ 238.627581][ T359] ? strcmp (arch/x86/lib/string_32.c:100) [ 238.627909][ T359] ddebug_condense_sites (lib/dynamic_debug.c:1448 (discriminator 1)) [ 238.628326][ T359] ddebug_add_module (lib/dynamic_debug.c:1492) [ 238.628714][ T359] ddebug_module_notify (lib/dynamic_debug.c:1589) [ 238.629116][ T359] notifier_call_chain (kernel/notifier.c:95) [ 238.629530][ T359] blocking_notifier_call_chain_robust (kernel/notifier.c:129 kernel/notifier.c:353 kernel/notifier.c:341) [ 238.630017][ T359] load_module (include/linux/notifier.h:208 kernel/module/main.c:2791 kernel/module/main.c:2972) [ 238.630383][ T359] init_module_from_file (kernel/module/main.c:3175) [ 238.630796][ T359] __ia32_sys_finit_module (kernel/module/main.c:3191 kernel/module/main.c:3212 kernel/module/main.c:3195 kernel/module/main.c:3195) [ 238.631225][ T359] ia32_sys_call (arch/x86/entry/syscall_32.c:42) [ 238.631601][ T359] __do_fast_syscall_32 (arch/x86/entry/common.c:165 (discriminator 1) arch/x86/entry/common.c:386 (discriminator 1)) [ 238.632021][ T359] do_fast_syscall_32 (arch/x86/entry/common.c:411 (discriminator 1)) [ 238.632411][ T359] do_SYSENTER_32 (arch/x86/entry/common.c:450) [ 238.632781][ T359] entry_SYSENTER_32 (arch/x86/entry/entry_32.S:836) [ 238.633177][ T359] EIP: 0xb7eee579 [ 238.633489][ T359] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d 76 00 58 b8 77 00 00 00 cd 80 90 8d 76 All code ======== 0: b8 01 10 06 03 mov $0x3061001,%eax 5: 74 b4 je 0xffffffffffffffbb 7: 01 10 add %edx,(%rax) 9: 07 (bad) a: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi e: 10 08 adc %cl,(%rax) 10: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi ... 20: 00 51 52 add %dl,0x52(%rcx) 23: 55 push %rbp 24:* 89 e5 mov %esp,%ebp <-- trapping instruction 26: 0f 34 sysenter 28: cd 80 int $0x80 2a: 5d pop %rbp 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 8d 76 00 lea 0x0(%rsi),%esi 35: 58 pop %rax 36: b8 77 00 00 00 mov $0x77,%eax 3b: cd 80 int $0x80 3d: 90 nop 3e: 8d .byte 0x8d 3f: 76 .byte 0x76 Code starting with the faulting instruction =========================================== 0: 5d pop %rbp 1: 5a pop %rdx 2: 59 pop %rcx 3: c3 ret 4: 90 nop 5: 90 nop 6: 90 nop 7: 90 nop 8: 8d 76 00 lea 0x0(%rsi),%esi b: 58 pop %rax c: b8 77 00 00 00 mov $0x77,%eax 11: cd 80 int $0x80 13: 90 nop 14: 8d .byte 0x8d 15: 76 .byte 0x76 The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20240430/202404302341.c696afcb-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki