[ 2.686917] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.687001] #PF: supervisor write access in kernel mode [ 2.687054] #PF: error_code(0x0002) - not-present page [ 2.687101] PGD 4a3c067 P4D 4a3c067 PUD 4a17067 PMD 0 [ 2.687154] Oops: Oops: 0002 [#1] SMP [ 2.687189] CPU: 3 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.687276] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.687335] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.687393] Code: 83 e6 01 41 57 41 56 4c 8d 77 20 41 55 41 54 41 89 f4 55 48 89 d5 53 48 89 fb 9c 58 fa 48 89 45 00 45 85 e4 0f 85 8a 00 00 00 48 0f ba 2b 00 41 0f 92 c5 72 0e 5b 44 89 e8 5d 41 5c 41 5d 41 [ 2.687556] RSP: 0018:ffffa787005b7cb8 EFLAGS: 00010046 [ 2.687602] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb761f [ 2.687672] RDX: ffffa787005b7cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.687741] RBP: ffffa787005b7cf0 R08: 0000000000000000 R09: 00000000000001af [ 2.687811] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.687879] R13: ffffa787005b7de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.687947] FS: 000000001c2b93c0(0000) GS:ffff9a52c4566000(0000) knlGS:0000000000000000 [ 2.688024] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.688087] CR2: 0000000000000000 CR3: 0000000003272005 CR4: 0000000000772ef0 [ 2.688159] PKRU: 55555554 [ 2.688181] Call Trace: [ 2.688206] [ 2.688229] __cancel_work+0x29/0xe0 [ 2.688268] ? dev_deactivate_many+0x2c9/0x300 [ 2.688329] __cancel_work_sync+0x16/0x80 [ 2.688365] __dev_close_many+0x11b/0x280 [ 2.688407] netif_close_many+0x98/0x160 [ 2.688440] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.688491] ? __queue_work+0x139/0x4e0 [ 2.688527] unregister_netdevice_queue+0xa0/0xe0 [ 2.688574] __tun_detach+0x45e/0x490 [ 2.688616] tun_chr_close+0x35/0xa0 [ 2.688649] __fput+0xda/0x290 [ 2.688690] __x64_sys_close+0x3d/0x80 [ 2.688731] do_syscall_64+0xa4/0xfd0 [ 2.688774] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.688827] RIP: 0033:0x4901eb [ 2.688862] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44 [ 2.689024] RSP: 002b:00007ffcea4aeb30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.689093] RAX: ffffffffffffffda RBX: 00007ffcea4af088 RCX: 00000000004901eb [ 2.689163] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.689233] RBP: 00007ffcea4aeb70 R08: 0000000000000000 R09: 0000000000000000 [ 2.689304] R10: 0000000000040000 R11: 0000000000000293 R12: 00007ffcea4af008 [ 2.689374] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.689443] [ 2.689466] Modules linked in: [ 2.689501] CR2: 0000000000000000 [ 2.689542] ---[ end trace 0000000000000000 ]--- [ 2.689595] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.689641] Code: 83 e6 01 41 57 41 56 4c 8d 77 20 41 55 41 54 41 89 f4 55 48 89 d5 53 48 89 fb 9c 58 fa 48 89 45 00 45 85 e4 0f 85 8a 00 00 00 48 0f ba 2b 00 41 0f 92 c5 72 0e 5b 44 89 e8 5d 41 5c 41 5d 41 [ 2.689805] RSP: 0018:ffffa787005b7cb8 EFLAGS: 00010046 [ 2.689857] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb761f [ 2.689926] RDX: ffffa787005b7cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.689996] RBP: ffffa787005b7cf0 R08: 0000000000000000 R09: 00000000000001af [ 2.690065] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.690134] R13: ffffa787005b7de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.690206] FS: 000000001c2b93c0(0000) GS:ffff9a52c4566000(0000) knlGS:0000000000000000 [ 2.690277] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.690333] CR2: 0000000000000000 CR3: 0000000003272005 CR4: 0000000000772ef0 [ 2.690405] PKRU: 55555554 [ 2.690428] note: packetdrill[228] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr