BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 1e8d48067 P4D 1e8d48067 PUD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 1 PID: 677 Comm: syz.0.68 Not tainted 5.4.289-syzkaller-00030-gcb850525fc3e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202 RAX: ffffffff8154e8aa RBX: 0000000000000101 RCX: ffff8881e30a3f00 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e70d71c0 RBP: ffff8881f6f09ec8 R08: ffffffff8154e4ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa3d8 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e70d71c0 FS: 00007f1538e936c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d15fc000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: call_timer_fn+0x36/0x390 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x879/0xbe0 kernel/time/timer.c:1817 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:end_of_stack include/linux/sched/task_stack.h:31 [inline] RIP: 0010:schedule_debug kernel/sched/core.c:4106 [inline] RIP: 0010:__schedule+0x108/0x1320 kernel/sched/core.c:4239 Code: 3c 20 00 74 08 48 89 df e8 85 ed 3d fd 48 89 5c 24 18 48 8b 03 48 89 44 24 28 48 8d 58 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 5e ed 3d fd 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 RSP: 0018:ffff8881e3287360 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffff1103c6147e3 RBX: ffff8881e30a3f18 RCX: ffff8881e30a3f00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8881e3287450 R08: ffffffff8231cac1 R09: ffffed103edeb135 R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 0000000000000001 R14: ffff8881f6f00000 R15: 1ffff1103c650e8c preempt_schedule_irq+0xc7/0x140 kernel/sched/core.c:4558 retint_kernel+0x1b/0x1b RIP: 0010:is_bpf_text_address+0x5/0x260 kernel/bpf/core.c:714 Code: f1 80 e1 07 80 c1 03 38 c1 0f 8c 16 ff ff ff 4c 89 f7 e8 ee 62 26 00 e9 09 ff ff ff 66 0f 1f 84 00 00 00 00 00 55 41 57 41 56 <41> 55 41 54 53 50 49 89 fe e8 ad 78 f6 ff e8 a8 55 e4 ff 8b 1d 86 RSP: 0018:ffff8881e32875a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000080000000 RBX: 00007f1539420de9 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00007f1539420de9 RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed103edeb135 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881e30a3f00 R13: ffffffff8153c410 R14: 0000000000000001 R15: 1ffff1103c650ec9 kernel_text_address kernel/extable.c:148 [inline] __kernel_text_address+0x94/0x100 kernel/extable.c:103 unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:313 arch_stack_walk+0xf5/0x140 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 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+0x105/0x2e0 mm/slub.c:3909 __kmalloc_node include/linux/slab.h:422 [inline] kmalloc_node include/linux/slab.h:599 [inline] kvmalloc_node+0x7e/0xf0 mm/util.c:596 kvmalloc include/linux/mm.h:761 [inline] kvzalloc include/linux/mm.h:769 [inline] netif_alloc_netdev_queues net/core/dev.c:9048 [inline] alloc_netdev_mqs+0x5d7/0xc70 net/core/dev.c:9676 tun_set_iff+0x51f/0xdc0 drivers/net/tun.c:2893 __tun_chr_ioctl+0x8a9/0x1d00 drivers/net/tun.c:3187 do_vfs_ioctl+0x742/0x1720 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+0xd4/0x110 fs/ioctl.c:747 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f1539420de9 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:00007f1538e93038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1539639fa0 RCX: 00007f1539420de9 RDX: 0000200000000000 RSI: 00000000400454ca RDI: 0000000000000004 RBP: 00007f15394a22a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1539639fa0 R15: 00007ffd0c917d78 Modules linked in: CR2: 0000000000000000 ---[ end trace f5c543bf08282ca0 ]--- RIP: 0010:0x0 Code: Bad RIP value. RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202 RAX: ffffffff8154e8aa RBX: 0000000000000101 RCX: ffff8881e30a3f00 RDX: 0000000000000101 RSI: 0000000000000000 RDI: ffff8881e70d71c0 RBP: ffff8881f6f09ec8 R08: ffffffff8154e4ee R09: 0000000000000003 R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffa3d8 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8881e70d71c0 FS: 00007f1538e936c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 00000001d15fc000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 3c 20 cmp $0x20,%al 2: 00 74 08 48 add %dh,0x48(%rax,%rcx,1) 6: 89 df mov %ebx,%edi 8: e8 85 ed 3d fd call 0xfd3ded92 d: 48 89 5c 24 18 mov %rbx,0x18(%rsp) 12: 48 8b 03 mov (%rbx),%rax 15: 48 89 44 24 28 mov %rax,0x28(%rsp) 1a: 48 8d 58 18 lea 0x18(%rax),%rbx 1e: 48 89 d8 mov %rbx,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) * 2a: 74 08 je 0x34 <-- trapping instruction 2c: 48 89 df mov %rbx,%rdi 2f: e8 5e ed 3d fd call 0xfd3ded92 34: 48 8b 1b mov (%rbx),%rbx 37: 48 89 d8 mov %rbx,%rax 3a: 48 c1 e8 03 shr $0x3,%rax 3e: 42 rex.X 3f: 80 .byte 0x80