BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1e572f067 P4D 1e572f067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 1644 Comm: syz.2.336 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: ffff8881cac9cec0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e3a731c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa500 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e3a731c0 FS: 00007f31ae6ef6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e1846000 CR4: 00000000003406a0 DR0: 0000200000000300 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:__slab_alloc+0x6b/0xa0 mm/slub.c:2709 Code: 41 89 c5 83 f8 08 73 40 4e 03 24 ed 10 7f 43 85 4c 89 ff 44 89 f6 48 8b 55 c0 4c 89 e1 e8 4d d8 ff ff 48 89 5d b8 ff 75 b8 9d <65> 48 8b 0c 25 28 00 00 00 48 3b 4d d0 75 20 48 83 c4 20 5b 41 5c RSP: 0018:ffff8881e85a7430 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff8881e9052000 RBX: 0000000000000286 RCX: 002005e98188ffff RDX: ffff8881e9054000 RSI: ffffea0007a41400 RDI: ffff8881f5c0c280 RBP: ffff8881e85a7478 R08: 0000000000000000 R09: 0000000080040004 R10: 00000000118c2d14 R11: 00000000d861fd53 R12: ffff8881f6f5b180 R13: 0000000000000001 R14: 0000000000000dc0 R15: ffff8881f5c0c280 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x176/0x2f0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x88/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:761 [inline] kvmalloc_array include/linux/mm.h:779 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:470 [inline] ptr_ring_init include/linux/ptr_ring.h:488 [inline] skb_array_init include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x3af/0x7a0 net/sched/sch_generic.c:784 qdisc_create_dflt+0x135/0x270 net/sched/sch_generic.c:944 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: 0033:0x7f31b0086969 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:00007f31ae6ef038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f31b02adfa0 RCX: 00007f31b0086969 RDX: 0000200000000080 RSI: 0000000000008914 RDI: 0000000000000008 RBP: 00007f31b0108ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f31b02adfa0 R15: 00007ffd5f17cbb8 Modules linked in: CR2: 0000000000000000 ---[ end trace 84f1588214f3ec2a ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09cf0 EFLAGS: 00010206 RAX: ffffffff8150a590 RBX: 0000000000000100 RCX: ffff8881cac9cec0 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881e3a731c0 RBP: ffff8881f6f09d30 R08: 0000000000000004 R09: 0000000000000003 R10: ffffed103ede1398 R11: 1ffff1103ede1398 R12: 00000000ffffa500 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e3a731c0 FS: 00007f31ae6ef6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001e1846000 CR4: 00000000003406a0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 41 89 c5 mov %eax,%r13d 3: 83 f8 08 cmp $0x8,%eax 6: 73 40 jae 0x48 8: 4e 03 24 ed 10 7f 43 add -0x7abc80f0(,%r13,8),%r12 f: 85 10: 4c 89 ff mov %r15,%rdi 13: 44 89 f6 mov %r14d,%esi 16: 48 8b 55 c0 mov -0x40(%rbp),%rdx 1a: 4c 89 e1 mov %r12,%rcx 1d: e8 4d d8 ff ff call 0xffffd86f 22: 48 89 5d b8 mov %rbx,-0x48(%rbp) 26: ff 75 b8 push -0x48(%rbp) 29: 9d popf * 2a: 65 48 8b 0c 25 28 00 mov %gs:0x28,%rcx <-- trapping instruction 31: 00 00 33: 48 3b 4d d0 cmp -0x30(%rbp),%rcx 37: 75 20 jne 0x59 39: 48 83 c4 20 add $0x20,%rsp 3d: 5b pop %rbx 3e: 41 5c pop %r12