[ 2.512036] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.512132] #PF: supervisor write access in kernel mode [ 2.512179] #PF: error_code(0x0002) - not-present page [ 2.512227] PGD 32e3067 P4D 32e3067 PUD 4e8a067 PMD 0 [ 2.512274] Oops: Oops: 0002 [#1] SMP [ 2.512313] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.512396] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.512451] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.512507] 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 [ 2.512654] RSP: 0018:ffffbc90805dfcb8 EFLAGS: 00010046 [ 2.512701] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb756f [ 2.512769] RDX: ffffbc90805dfcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.512835] RBP: ffffbc90805dfcf0 R08: 0000000000000000 R09: 00000000000002a1 [ 2.512902] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.512962] R13: ffffbc90805dfde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.513032] FS: 000000003c98b3c0(0000) GS:ffff980d73ae6000(0000) knlGS:0000000000000000 [ 2.513103] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.513158] CR2: 0000000000000000 CR3: 0000000004cff005 CR4: 0000000000772ef0 [ 2.513227] PKRU: 55555554 [ 2.513253] Call Trace: [ 2.513275] [ 2.513301] __cancel_work+0x29/0xe0 [ 2.513341] ? dev_deactivate_many+0x2c9/0x300 [ 2.513396] __cancel_work_sync+0x16/0x80 [ 2.513433] __dev_close_many+0x11b/0x280 [ 2.513476] netif_close_many+0x98/0x160 [ 2.513513] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.513564] ? __queue_work+0x139/0x4e0 [ 2.513601] unregister_netdevice_queue+0xa0/0xe0 [ 2.513648] __tun_detach+0x45e/0x490 [ 2.513690] tun_chr_close+0x35/0xa0 [ 2.513727] __fput+0xda/0x290 [ 2.513772] __x64_sys_close+0x3d/0x80 [ 2.513808] do_syscall_64+0xa4/0xfd0 [ 2.513853] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.513900] RIP: 0033:0x4901eb [ 2.513937] 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 [ 2.514085] RSP: 002b:00007ffc648787b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.514152] RAX: ffffffffffffffda RBX: 00007ffc64878d08 RCX: 00000000004901eb [ 2.514219] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.514287] RBP: 00007ffc648787f0 R08: 0000000000000000 R09: 0000000000000000 [ 2.514354] R10: 0000000000100000 R11: 0000000000000293 R12: 00007ffc64878c88 [ 2.514422] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.514491] [ 2.514517] Modules linked in: [ 2.514556] CR2: 0000000000000000 [ 2.514592] ---[ end trace 0000000000000000 ]--- [ 2.514638] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.514686] 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 [ 2.514834] RSP: 0018:ffffbc90805dfcb8 EFLAGS: 00010046 [ 2.514882] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb756f [ 2.514949] RDX: ffffbc90805dfcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.515016] RBP: ffffbc90805dfcf0 R08: 0000000000000000 R09: 00000000000002a1 [ 2.515083] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.515151] R13: ffffbc90805dfde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.515220] FS: 000000003c98b3c0(0000) GS:ffff980d73ae6000(0000) knlGS:0000000000000000 [ 2.515287] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.515343] CR2: 0000000000000000 CR3: 0000000004cff005 CR4: 0000000000772ef0 [ 2.515412] PKRU: 55555554 [ 2.515440] note: packetdrill[228] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr