BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 0 P4D 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 337 Comm: udevd 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: ffff8881f36c6e40 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881eb2af1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9c70 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eb2af1c0 FS: 00007ff448e6bc80(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d853b000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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 RIP: 0010:update_stack_state+0x286/0x4c0 arch/x86/kernel/unwind_frame.c:230 Code: 80 e1 07 80 c1 03 38 c1 0f 8c 67 ff ff ff 48 89 df e8 6e d3 5f 00 e9 5a ff ff ff 48 8b 5d a0 4c 8d 73 40 4d 89 f7 49 c1 ef 03 <48> b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 4c 89 f7 e8 61 RSP: 0018:ffff8881d87673f8 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffff8881d8767568 RCX: ffff8881d8767b01 RDX: ffff8881d8767bc8 RSI: 1ffff1103b0eceae RDI: ffff8881d87675c0 RBP: ffff8881d87674c8 R08: dffffc0000000000 R09: ffff8881d8767568 R10: ffffed103b0eceb9 R11: 1ffff1103b0ecead R12: ffff8881d8767570 R13: 0000000000000001 R14: ffff8881d87675a8 R15: 1ffff1103b0eceb5 unwind_next_frame+0x3f7/0x760 arch/x86/kernel/unwind_frame.c:311 arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0xf0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529 kasan_kmalloc+0xd/0x20 mm/kasan/common.c:543 kmem_cache_alloc_trace+0x112/0x290 mm/slub.c:2856 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] uevent_show+0x160/0x340 drivers/base/core.c:1938 dev_attr_show+0x56/0xd0 drivers/base/core.c:1647 sysfs_kf_seq_show+0x263/0x3d0 fs/sysfs/file.c:61 kernfs_seq_show+0x110/0x160 fs/kernfs/file.c:167 seq_read+0x540/0xe50 fs/seq_file.c:232 kernfs_fop_read+0x127/0x480 fs/kernfs/file.c:251 __vfs_read+0xf9/0x5c0 fs/read_write.c:425 vfs_read+0x15a/0x370 fs/read_write.c:461 ksys_read+0x140/0x240 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:595 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7ff448f96b6a Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83 RSP: 002b:00007fff05fb7c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000055984e6dd390 RCX: 00007ff448f96b6a RDX: 0000000000001000 RSI: 000055984e6fa950 RDI: 0000000000000009 RBP: 000055984e6dd390 R08: 0000000000000009 R09: 0000000000000020 R10: 000000000000010f R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000003fff R14: 00007fff05fb80e8 R15: 000000000000000a Modules linked in: CR2: 0000000000000000 ---[ end trace 626bb243c09eed00 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6e09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881f36c6e40 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881eb2af1c0 RBP: ffff8881f6e09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103edc1398 R11: 1ffff1103edc1398 R12: 00000000ffff9c70 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881eb2af1c0 FS: 00007ff448e6bc80(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d853b000 CR4: 00000000003406b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 80 e1 07 and $0x7,%cl 3: 80 c1 03 add $0x3,%cl 6: 38 c1 cmp %al,%cl 8: 0f 8c 67 ff ff ff jl 0xffffff75 e: 48 89 df mov %rbx,%rdi 11: e8 6e d3 5f 00 call 0x5fd384 16: e9 5a ff ff ff jmp 0xffffff75 1b: 48 8b 5d a0 mov -0x60(%rbp),%rbx 1f: 4c 8d 73 40 lea 0x40(%rbx),%r14 23: 4d 89 f7 mov %r14,%r15 26: 49 c1 ef 03 shr $0x3,%r15 * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 41 80 3c 07 00 cmpb $0x0,(%r15,%rax,1) 39: 74 08 je 0x43 3b: 4c 89 f7 mov %r14,%rdi 3e: e8 .byte 0xe8 3f: 61 (bad)