BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1e7dbb067 P4D 1e7dbb067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 2539 Comm: syz.4.686 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:ffff8881f6f09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881d4a2de80 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e816f1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa9b0 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e816f1c0 FS: 00007f298cc336c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001f0b5b000 CR4: 00000000003406a0 DR0: 0000200000000300 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:__kernel_text_address+0xcf/0x100 kernel/extable.c:116 Code: f4 01 45 84 ff 75 05 e8 af 79 0e 00 45 84 e4 74 19 49 81 fe 00 70 34 86 0f 93 c0 49 81 fe 77 49 46 86 0f 92 c1 20 c1 0f b6 d9 <89> d8 5b 41 5c 41 5e 41 5f 5d c3 48 c7 c1 00 83 2b 86 80 e1 07 80 RSP: 0018:ffff8881c67bf550 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 9618f75a861ad001 RDX: ffff8881c67bf9f8 RSI: 1ffff11038cf7eb6 RDI: ffffffff8137614c RBP: ffff8881c67bf570 R08: dffffc0000000000 R09: ffff8881c67bf5a8 R10: ffffed1038cf7ec1 R11: 1ffff11038cf7eb5 R12: ffff8881d4a2de80 R13: 1ffff11038cf7ec8 R14: dffffc0000000000 R15: 1ffff11038cf7ebe unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_frame.c:19 arch_stack_walk+0xf0/0x140 arch/x86/kernel/stacktrace.c:26 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_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1c3/0x280 mm/kasan/common.c:487 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook+0xb7/0x180 mm/slub.c:1494 slab_free mm/slub.c:3080 [inline] kmem_cache_free+0x10c/0x2c0 mm/slub.c:3096 vm_area_free+0x1c/0x20 kernel/fork.c:369 remove_vma mm/mmap.c:182 [inline] exit_mmap+0x41b/0x520 mm/mmap.c:3202 __mmput+0x92/0x2e0 kernel/fork.c:1101 mmput+0x47/0x60 kernel/fork.c:1122 copy_process+0x1d03/0x2cf0 kernel/fork.c:2298 _do_fork+0x190/0x860 kernel/fork.c:2399 __do_sys_clone kernel/fork.c:2557 [inline] __se_sys_clone kernel/fork.c:2538 [inline] __x64_sys_clone+0x12e/0x160 kernel/fork.c:2538 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f298e5eb969 Code: ff ff c3 66 2e 0f 1f 84 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 RSP: 002b:00007f298cc32fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f298e813080 RCX: 00007f298e5eb969 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f298e66dab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f298e813080 R15: 00007ffedc9efbc8 Modules linked in: CR2: 0000000000000000 ---[ end trace 19becc4a030d8c00 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881d4a2de80 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881e816f1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa9b0 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e816f1c0 FS: 00007f298cc336c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001f0b5b000 CR4: 00000000003406a0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: f4 hlt 1: 01 45 84 add %eax,-0x7c(%rbp) 4: ff 75 05 push 0x5(%rbp) 7: e8 af 79 0e 00 call 0xe79bb c: 45 84 e4 test %r12b,%r12b f: 74 19 je 0x2a 11: 49 81 fe 00 70 34 86 cmp $0xffffffff86347000,%r14 18: 0f 93 c0 setae %al 1b: 49 81 fe 77 49 46 86 cmp $0xffffffff86464977,%r14 22: 0f 92 c1 setb %cl 25: 20 c1 and %al,%cl 27: 0f b6 d9 movzbl %cl,%ebx * 2a: 89 d8 mov %ebx,%eax <-- trapping instruction 2c: 5b pop %rbx 2d: 41 5c pop %r12 2f: 41 5e pop %r14 31: 41 5f pop %r15 33: 5d pop %rbp 34: c3 ret 35: 48 c7 c1 00 83 2b 86 mov $0xffffffff862b8300,%rcx 3c: 80 e1 07 and $0x7,%cl 3f: 80 .byte 0x80