[ 5.831052] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 5.831155] #PF: supervisor write access in kernel mode [ 5.831190] #PF: error_code(0x0002) - not-present page [ 5.831220] PGD 4df1067 P4D 4df1067 PUD 4e0b067 PMD 0 [ 5.831261] Oops: Oops: 0002 [#1] SMP [ 5.831286] CPU: 2 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 5.831342] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 5.831380] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 5.831420] 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 [ 5.831529] RSP: 0018:ffffbb850057fcb8 EFLAGS: 00010046 [ 5.831564] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb826a [ 5.831614] RDX: ffffbb850057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 5.831658] RBP: ffffbb850057fcf0 R08: 0000000000000000 R09: 0000000000000390 [ 5.831703] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 5.831747] R13: ffffbb850057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 5.831805] FS: 0000000009ca93c0(0000) GS:ffff9ea0a18e6000(0000) knlGS:0000000000000000 [ 5.831871] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5.831913] CR2: 0000000000000000 CR3: 0000000004c81003 CR4: 0000000000772ef0 [ 5.831959] PKRU: 55555554 [ 5.831978] Call Trace: [ 5.831995] [ 5.832021] __cancel_work+0x29/0xe0 [ 5.832048] ? dev_deactivate_many+0x2c9/0x300 [ 5.832088] __cancel_work_sync+0x16/0x80 [ 5.832116] __dev_close_many+0x11b/0x280 [ 5.832144] netif_close_many+0x98/0x160 [ 5.832171] unregister_netdevice_many_notify+0x1d8/0xa50 [ 5.832207] ? __queue_work+0x139/0x4e0 [ 5.832234] unregister_netdevice_queue+0xa0/0xe0 [ 5.832277] __tun_detach+0x45e/0x490 [ 5.832305] tun_chr_close+0x35/0xa0 [ 5.832333] __fput+0xda/0x290 [ 5.832365] __x64_sys_close+0x3d/0x80 [ 5.832393] do_syscall_64+0xa4/0xfd0 [ 5.832426] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 5.832461] RIP: 0033:0x4901eb [ 5.832488] 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 [ 5.832597] RSP: 002b:00007ffd6b1f0680 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 5.832647] RAX: ffffffffffffffda RBX: 00007ffd6b1f0bd8 RCX: 00000000004901eb [ 5.832698] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 5.832743] RBP: 00007ffd6b1f06c0 R08: 0000000000000000 R09: 0000000000000000 [ 5.832787] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffd6b1f0b58 [ 5.832837] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 5.832882] [ 5.832901] Modules linked in: [ 5.832924] CR2: 0000000000000000 [ 5.832952] ---[ end trace 0000000000000000 ]--- [ 5.832993] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 5.833028] 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 [ 5.833131] RSP: 0018:ffffbb850057fcb8 EFLAGS: 00010046 [ 5.833167] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb826a [ 5.833211] RDX: ffffbb850057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 5.833261] RBP: ffffbb850057fcf0 R08: 0000000000000000 R09: 0000000000000390 [ 5.833307] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 5.833351] R13: ffffbb850057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 5.833397] FS: 0000000009ca93c0(0000) GS:ffff9ea0a18e6000(0000) knlGS:0000000000000000 [ 5.833447] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 5.833488] CR2: 0000000000000000 CR3: 0000000004c81003 CR4: 0000000000772ef0 [ 5.833534] PKRU: 55555554 [ 5.833554] note: packetdrill[227] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr