BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1e66ed067 P4D 1e66ed067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 611 Comm: syz.4.69 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: ffff8881e5860000 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881d47471c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9690 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d47471c0 FS: 00007fc31dff46c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e5da9000 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:stack_trace_consume_entry+0x2c/0x250 kernel/stacktrace.c:86 Code: 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 28 48 89 75 b0 49 89 fc 49 be 00 00 00 00 00 fc ff df e8 c9 c2 0f 00 4d 8d 6c 24 10 <4c> 89 6d c8 49 c1 ed 03 43 0f b6 44 35 00 84 c0 0f 85 4b 01 00 00 RSP: 0018:ffff8881e59ff828 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 RAX: ffffffff814fbc17 RBX: ffff8881e59ff940 RCX: 0000000000080000 RDX: ffffc90004551000 RSI: 00000000000008ac RDI: 00000000000008ad RBP: ffff8881e59ff878 R08: dffffc0000000000 R09: ffff8881e59ff888 R10: ffffed103cb3ff1d R11: 1ffff1103cb3ff11 R12: ffff8881e59ff940 R13: ffff8881e59ff950 R14: dffffc0000000000 R15: ffff8881e59ff888 arch_stack_walk+0x100/0x140 arch/x86/kernel/stacktrace.c:27 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_slab_alloc+0x12/0x20 mm/kasan/common.c:537 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xe2/0x270 mm/slub.c:2842 kmem_cache_zalloc include/linux/slab.h:680 [inline] __alloc_file+0x28/0x320 fs/file_table.c:101 alloc_empty_file+0x97/0x180 fs/file_table.c:151 alloc_file+0x59/0x540 fs/file_table.c:193 alloc_file_pseudo+0x17a/0x1f0 fs/file_table.c:233 sock_alloc_file+0xba/0x250 net/socket.c:398 __sys_socketpair+0x38c/0x5a0 net/socket.c:1609 __do_sys_socketpair net/socket.c:1631 [inline] __se_sys_socketpair net/socket.c:1628 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1628 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fc31f9ac969 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:00007fc31dff4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007fc31fbd4080 RCX: 00007fc31f9ac969 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000001e RBP: 00007fc31fa2eab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc31fbd4080 R15: 00007fff491e4418 Modules linked in: CR2: 0000000000000000 ---[ end trace 4a61540ea4e03678 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e5860000 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881d47471c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffff9690 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881d47471c0 FS: 00007fc31dff46c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e5da9000 CR4: 00000000003406a0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 89 e5 mov %esp,%ebp 2: 41 57 push %r15 4: 41 56 push %r14 6: 41 55 push %r13 8: 41 54 push %r12 a: 53 push %rbx b: 48 83 ec 28 sub $0x28,%rsp f: 48 89 75 b0 mov %rsi,-0x50(%rbp) 13: 49 89 fc mov %rdi,%r12 16: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 1d: fc ff df 20: e8 c9 c2 0f 00 call 0xfc2ee 25: 4d 8d 6c 24 10 lea 0x10(%r12),%r13 * 2a: 4c 89 6d c8 mov %r13,-0x38(%rbp) <-- trapping instruction 2e: 49 c1 ed 03 shr $0x3,%r13 32: 43 0f b6 44 35 00 movzbl 0x0(%r13,%r14,1),%eax 38: 84 c0 test %al,%al 3a: 0f 85 4b 01 00 00 jne 0x18b