BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1f3ed4067 P4D 1f3ed4067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 1633 Comm: syz.1.366 Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e75d3f00 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e85431c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9e60 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e85431c0 FS: 00007f5ebfe596c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001cbf2f000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: <IRQ> call_timer_fn+0x3c/0x380 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x81d/0xb60 kernel/time/timer.c:1817 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1830 __do_softirq+0x236/0x660 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x197/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11d/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 </IRQ> RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:186 Code: 00 00 55 48 89 e5 be 0c 00 00 00 48 c7 c7 00 96 d1 85 e8 6b f2 2d 00 5d c3 00 00 90 90 00 00 90 90 00 55 48 89 e5 48 8b 45 08 <65> 48 8b 0d 90 0e a3 7e 65 8b 15 95 0e a3 7e f7 c2 00 01 1f 00 74 RSP: 0018:ffff8881e7087390 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81a3a8aa RBX: ffff8881ebc9cf30 RCX: dffffc0000000000 RDX: ffff8881e75d3f00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881e7087390 R08: dffffc0000000000 R09: ffff8881e7087428 R10: ffffed103ce10e88 R11: 1ffff1103ce10e85 R12: 0000000000000000 R13: 1ffff1103bdb55fc R14: dffffc0000000000 R15: ffff8881dedaafe0 fsnotify+0xdea/0xeb0 fs/notify/fsnotify.c:343 fsnotify_path include/linux/fsnotify.h:54 [inline] fsnotify_modify include/linux/fsnotify.h:298 [inline] __kernel_write+0x271/0x320 fs/read_write.c:518 dump_emit+0x1c0/0x2c0 fs/coredump.c:838 elf_core_dump+0x3465/0x3bd0 fs/binfmt_elf.c:2352 do_coredump+0x1d8c/0x2ab0 fs/coredump.c:801 get_signal+0xdb7/0x13d0 kernel/signal.c:2732 do_signal+0xad/0xda0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xc4/0x1b0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x18e/0x1f0 arch/x86/entry/common.c:194 ret_from_intr+0x1c/0x1c RIP: 0033:0x7f5ec17f0971 Code: 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 <c3> 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:00002000000000e0 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f5ec1a17fa0 RCX: 00007f5ec17f0969 RDX: 0000200000000180 RSI: 00002000000000e0 RDI: 0000000002040000 RBP: 00007f5ec1872ab1 R08: 0000200000000240 R09: 0000200000000240 R10: 0000200000000100 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5ec1a17fa0 R15: 00007fffbddbf958 Modules linked in: CR2: 0000000000000000 ---[ end trace ac131204cf4d1735 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e75d3f00 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e85431c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9e60 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e85431c0 FS: 00007f5ebfe596c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001cbf2f000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 55 push %rbp 3: 48 89 e5 mov %rsp,%rbp 6: be 0c 00 00 00 mov $0xc,%esi b: 48 c7 c7 00 96 d1 85 mov $0xffffffff85d19600,%rdi 12: e8 6b f2 2d 00 call 0x2df282 17: 5d pop %rbp 18: c3 ret 19: 00 00 add %al,(%rax) 1b: 90 nop 1c: 90 nop 1d: 00 00 add %al,(%rax) 1f: 90 nop 20: 90 nop 21: 00 55 48 add %dl,0x48(%rbp) 24: 89 e5 mov %esp,%ebp 26: 48 8b 45 08 mov 0x8(%rbp),%rax * 2a: 65 48 8b 0d 90 0e a3 mov %gs:0x7ea30e90(%rip),%rcx # 0x7ea30ec2 <-- trapping instruction 31: 7e 32: 65 8b 15 95 0e a3 7e mov %gs:0x7ea30e95(%rip),%edx # 0x7ea30ece 39: f7 c2 00 01 1f 00 test $0x1f0100,%edx 3f: 74 .byte 0x74