[ 2.787288] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.787385] #PF: supervisor write access in kernel mode [ 2.787429] #PF: error_code(0x0002) - not-present page [ 2.787463] PGD 49e1067 P4D 49e1067 PUD 4a80067 PMD 0 [ 2.787508] Oops: Oops: 0002 [#1] SMP [ 2.787548] CPU: 0 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.787610] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.787676] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.787719] 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 [ 2.787849] RSP: 0018:ffffbba70057fcb8 EFLAGS: 00010046 [ 2.787894] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb767a [ 2.787958] RDX: ffffbba70057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.788012] RBP: ffffbba70057fcf0 R08: 0000000000000000 R09: 00000000000000a5 [ 2.788077] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.788129] R13: ffffbba70057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.788188] FS: 000000001511d3c0(0000) GS:ffff92ff105e6000(0000) knlGS:0000000000000000 [ 2.788245] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.788291] CR2: 0000000000000000 CR3: 0000000004b32006 CR4: 0000000000772ef0 [ 2.788348] PKRU: 55555554 [ 2.788369] Call Trace: [ 2.788387] [ 2.788410] __cancel_work+0x29/0xe0 [ 2.788442] ? dev_deactivate_many+0x2c9/0x300 [ 2.788483] __cancel_work_sync+0x16/0x80 [ 2.788513] __dev_close_many+0x11b/0x280 [ 2.788544] netif_close_many+0x98/0x160 [ 2.788575] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.788614] ? __queue_work+0x139/0x4e0 [ 2.788644] unregister_netdevice_queue+0xa0/0xe0 [ 2.788691] __tun_detach+0x45e/0x490 [ 2.788726] tun_chr_close+0x35/0xa0 [ 2.788756] __fput+0xda/0x290 [ 2.788787] __x64_sys_close+0x3d/0x80 [ 2.788822] do_syscall_64+0xa4/0xfd0 [ 2.788856] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.788900] RIP: 0033:0x4901eb [ 2.788940] 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 [ 2.789063] RSP: 002b:00007ffd799c38a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.789125] RAX: ffffffffffffffda RBX: 00007ffd799c3df8 RCX: 00000000004901eb [ 2.789173] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.789222] RBP: 00007ffd799c38e0 R08: 0000000000000000 R09: 0000000000000000 [ 2.789276] R10: 000000001513ca90 R11: 0000000000000293 R12: 00007ffd799c3d78 [ 2.789330] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.789383] [ 2.789405] Modules linked in: [ 2.789431] CR2: 0000000000000000 [ 2.789461] ---[ end trace 0000000000000000 ]--- [ 2.789499] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.789539] 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 [ 2.789661] RSP: 0018:ffffbba70057fcb8 EFLAGS: 00010046 [ 2.789704] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb767a [ 2.789761] RDX: ffffbba70057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.789831] RBP: ffffbba70057fcf0 R08: 0000000000000000 R09: 00000000000000a5 [ 2.789878] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.789948] R13: ffffbba70057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.790006] FS: 000000001511d3c0(0000) GS:ffff92ff105e6000(0000) knlGS:0000000000000000 [ 2.790059] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.790111] CR2: 0000000000000000 CR3: 0000000004b32006 CR4: 0000000000772ef0 [ 2.790168] PKRU: 55555554 [ 2.790189] note: packetdrill[229] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr