BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1d673d067 P4D 1d673d067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 4242 Comm: syz.8.1064 Tainted: G W 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: ffff8881e9c10000 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881dc9cb1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffe898 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881dc9cb1c0 FS: 00007fe7447586c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e717f000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000200000000300 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:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:180 Code: 66 0f 1f 84 00 00 00 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 RSP: 0018:ffff8881d6ac7038 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff814fbc95 RBX: 1ffff1103ad58e2d RCX: 0000000000000002 RDX: ffff8881e9c10000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff8881d6ac7098 R08: dffffc0000000000 R09: ffff8881d6ac70a8 R10: ffffed103ad58e21 R11: 1ffff1103ad58e15 R12: ffff8881d6ac7160 R13: 1ffff1103ad58e2e R14: 0000000000000000 R15: 0000000000000002 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] __kmalloc+0x106/0x2f0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kzalloc_node include/linux/slab.h:701 [inline] qdisc_alloc+0x7f/0x7e0 net/sched/sch_generic.c:864 qdisc_create_dflt+0x69/0x270 net/sched/sch_generic.c:937 mq_init+0x2df/0x660 net/sched/sch_mq.c:90 qdisc_create_dflt+0x135/0x270 net/sched/sch_generic.c:944 attach_default_qdiscs net/sched/sch_generic.c:1113 [inline] dev_activate+0x132/0xc80 net/sched/sch_generic.c:1154 __dev_open+0x2d3/0x3f0 net/core/dev.c:1335 __dev_change_flags+0x20a/0x6a0 net/core/dev.c:7958 dev_change_flags+0x88/0x1a0 net/core/dev.c:8029 dev_ifsioc+0x110/0xa40 net/core/dev_ioctl.c:226 dev_ioctl+0x550/0xb80 net/core/dev_ioctl.c:483 sock_do_ioctl+0x235/0x330 net/socket.c:1081 sock_ioctl+0x505/0x710 net/socket.c:1198 do_vfs_ioctl+0x753/0x13f0 fs/ioctl.c:47 ksys_ioctl fs/ioctl.c:742 [inline] __do_sys_ioctl fs/ioctl.c:749 [inline] __se_sys_ioctl fs/ioctl.c:747 [inline] __x64_sys_ioctl+0xe1/0x120 fs/ioctl.c:747 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fe746131969 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:00007fe744758038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe746359160 RCX: 00007fe746131969 RDX: 0000200000002280 RSI: 0000000000008914 RDI: 0000000000000008 RBP: 00007fe7461b3ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe746359160 R15: 00007ffc07027bd8 Modules linked in: CR2: 0000000000000000 ---[ end trace 636a26dafd5070ef ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881e9c10000 RDX: 0000000080000100 RSI: 0000000000000000 RDI: ffff8881dc9cb1c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffe898 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881dc9cb1c0 FS: 00007fe7447586c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e717f000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600