[ 3.512276] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 3.512367] #PF: supervisor write access in kernel mode [ 3.512415] #PF: error_code(0x0002) - not-present page [ 3.512457] PGD 400a067 P4D 400a067 PUD 3256067 PMD 0 [ 3.512530] Oops: Oops: 0002 [#1] SMP [ 3.512569] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 3.512652] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 3.512703] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 3.512758] 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 [ 3.512907] RSP: 0018:ffffbb8ec057fcb8 EFLAGS: 00010046 [ 3.512955] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7956 [ 3.513022] RDX: ffffbb8ec057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 3.513084] RBP: ffffbb8ec057fcf0 R08: 0000000000000000 R09: 0000000000000229 [ 3.513145] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 3.513207] R13: ffffbb8ec057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 3.513271] FS: 000000002d69f3c0(0000) GS:ffff990d760e6000(0000) knlGS:0000000000000000 [ 3.513338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.513395] CR2: 0000000000000000 CR3: 0000000002fb7001 CR4: 0000000000772ef0 [ 3.513456] PKRU: 55555554 [ 3.513481] Call Trace: [ 3.513503] [ 3.513529] __cancel_work+0x29/0xe0 [ 3.513564] ? dev_deactivate_many+0x2c9/0x300 [ 3.513618] __cancel_work_sync+0x16/0x80 [ 3.513656] __dev_close_many+0x11b/0x280 [ 3.513693] netif_close_many+0x98/0x160 [ 3.513730] unregister_netdevice_many_notify+0x1d8/0xa50 [ 3.513776] ? __queue_work+0x139/0x4e0 [ 3.513813] unregister_netdevice_queue+0xa0/0xe0 [ 3.513861] __tun_detach+0x45e/0x490 [ 3.513898] tun_chr_close+0x35/0xa0 [ 3.513933] __fput+0xda/0x290 [ 3.513971] __x64_sys_close+0x3d/0x80 [ 3.514008] do_syscall_64+0xa4/0xfd0 [ 3.514049] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 3.514095] RIP: 0033:0x4901eb [ 3.514132] 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 [ 3.514279] RSP: 002b:00007ffdbb167430 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 3.514346] RAX: ffffffffffffffda RBX: 00007ffdbb167988 RCX: 00000000004901eb [ 3.514413] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 3.514473] RBP: 00007ffdbb167470 R08: 0000000000000000 R09: 0000000000000000 [ 3.514533] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffdbb167908 [ 3.514594] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 3.514656] [ 3.514681] Modules linked in: [ 3.514720] CR2: 0000000000000000 [ 3.514755] ---[ end trace 0000000000000000 ]--- [ 3.514802] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 3.514849] 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 [ 3.514997] RSP: 0018:ffffbb8ec057fcb8 EFLAGS: 00010046 [ 3.515044] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7956 [ 3.515104] RDX: ffffbb8ec057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 3.515164] RBP: ffffbb8ec057fcf0 R08: 0000000000000000 R09: 0000000000000229 [ 3.515225] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 3.515285] R13: ffffbb8ec057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 3.515347] FS: 000000002d69f3c0(0000) GS:ffff990d760e6000(0000) knlGS:0000000000000000 [ 3.515413] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 3.515469] CR2: 0000000000000000 CR3: 0000000002fb7001 CR4: 0000000000772ef0 [ 3.515531] PKRU: 55555554 [ 3.515559] note: packetdrill[228] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr