[ 2.611223] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.611333] #PF: supervisor write access in kernel mode [ 2.611372] #PF: error_code(0x0002) - not-present page [ 2.611410] PGD 4939067 P4D 4939067 PUD 493c067 PMD 0 [ 2.611452] Oops: Oops: 0002 [#1] SMP [ 2.611485] CPU: 0 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.611550] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.611596] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.611652] 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 [ 2.611785] RSP: 0018:ffffbfad805b7cb8 EFLAGS: 00010046 [ 2.611822] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb75d6 [ 2.611875] RDX: ffffbfad805b7cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.611929] RBP: ffffbfad805b7cf0 R08: 0000000000000000 R09: 0000000000000100 [ 2.611983] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.612043] R13: ffffbfad805b7de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.612102] FS: 000000001f5973c0(0000) GS:ffff9de78a9e6000(0000) knlGS:0000000000000000 [ 2.612179] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.612240] CR2: 0000000000000000 CR3: 0000000004935001 CR4: 0000000000772ef0 [ 2.612305] PKRU: 55555554 [ 2.612330] Call Trace: [ 2.612353] [ 2.612379] __cancel_work+0x29/0xe0 [ 2.612422] ? dev_deactivate_many+0x2c9/0x300 [ 2.612473] __cancel_work_sync+0x16/0x80 [ 2.612511] __dev_close_many+0x11b/0x280 [ 2.612550] netif_close_many+0x98/0x160 [ 2.612586] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.612636] ? __queue_work+0x139/0x4e0 [ 2.612673] unregister_netdevice_queue+0xa0/0xe0 [ 2.612722] __tun_detach+0x45e/0x490 [ 2.612760] tun_chr_close+0x35/0xa0 [ 2.612797] __fput+0xda/0x290 [ 2.612839] __x64_sys_close+0x3d/0x80 [ 2.612875] do_syscall_64+0xa4/0xfd0 [ 2.612913] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.612961] RIP: 0033:0x4901eb [ 2.612998] 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 [ 2.613147] RSP: 002b:00007ffeedd37570 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.613216] RAX: ffffffffffffffda RBX: 00007ffeedd37ac8 RCX: 00000000004901eb [ 2.613278] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.613338] RBP: 00007ffeedd375b0 R08: 0000000000000000 R09: 0000000000000000 [ 2.613406] R10: 000000001f5b6b50 R11: 0000000000000293 R12: 00007ffeedd37a48 [ 2.613468] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.613537] [ 2.613563] Modules linked in: [ 2.613596] CR2: 0000000000000000 [ 2.613633] ---[ end trace 0000000000000000 ]--- [ 2.613679] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.613726] 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 [ 2.613869] RSP: 0018:ffffbfad805b7cb8 EFLAGS: 00010046 [ 2.613915] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb75d6 [ 2.613976] RDX: ffffbfad805b7cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.614038] RBP: ffffbfad805b7cf0 R08: 0000000000000000 R09: 0000000000000100 [ 2.614107] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.614168] R13: ffffbfad805b7de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.614229] FS: 000000001f5973c0(0000) GS:ffff9de78a9e6000(0000) knlGS:0000000000000000 [ 2.614297] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.614354] CR2: 0000000000000000 CR3: 0000000004935001 CR4: 0000000000772ef0 [ 2.614416] PKRU: 55555554 [ 2.614444] note: packetdrill[228] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr