[ 2.722252] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.722350] #PF: supervisor write access in kernel mode [ 2.722402] #PF: error_code(0x0002) - not-present page [ 2.722454] PGD 328f067 P4D 328f067 PUD 3297067 PMD 0 [ 2.722511] Oops: Oops: 0002 [#1] SMP [ 2.722550] CPU: 3 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.722646] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.722711] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.722779] 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 [ 2.722958] RSP: 0018:ffffa87040577cb8 EFLAGS: 00010046 [ 2.723009] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7640 [ 2.723081] RDX: ffffa87040577cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.723156] RBP: ffffa87040577cf0 R08: 0000000000000000 R09: 0000000000000089 [ 2.723234] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.723311] R13: ffffa87040577de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.723389] FS: 00000000348873c0(0000) GS:ffff967fd7f66000(0000) knlGS:0000000000000000 [ 2.723473] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.723536] CR2: 0000000000000000 CR3: 0000000003298006 CR4: 0000000000772ef0 [ 2.723614] PKRU: 55555554 [ 2.723638] Call Trace: [ 2.723666] [ 2.723692] __cancel_work+0x29/0xe0 [ 2.723736] ? dev_deactivate_many+0x2c9/0x300 [ 2.723789] __cancel_work_sync+0x16/0x80 [ 2.723826] __dev_close_many+0x11b/0x280 [ 2.723873] netif_close_many+0x98/0x160 [ 2.723911] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.723970] ? __queue_work+0x139/0x4e0 [ 2.724016] unregister_netdevice_queue+0xa0/0xe0 [ 2.724067] __tun_detach+0x45e/0x490 [ 2.724112] tun_chr_close+0x35/0xa0 [ 2.724150] __fput+0xda/0x290 [ 2.724197] __x64_sys_close+0x3d/0x80 [ 2.724236] do_syscall_64+0xa4/0xfd0 [ 2.724282] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.724332] RIP: 0033:0x4901eb [ 2.724370] 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 [ 2.724549] RSP: 002b:00007ffde48c3940 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.724626] RAX: ffffffffffffffda RBX: 00007ffde48c3e98 RCX: 00000000004901eb [ 2.724703] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.724780] RBP: 00007ffde48c3980 R08: 0000000000000000 R09: 0000000000000000 [ 2.724857] R10: 000000003488f4f0 R11: 0000000000000293 R12: 00007ffde48c3e18 [ 2.724932] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.725009] [ 2.725034] Modules linked in: [ 2.725074] CR2: 0000000000000000 [ 2.725112] ---[ end trace 0000000000000000 ]--- [ 2.725161] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.725212] 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 [ 2.725391] RSP: 0018:ffffa87040577cb8 EFLAGS: 00010046 [ 2.725442] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7640 [ 2.725518] RDX: ffffa87040577cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.725595] RBP: ffffa87040577cf0 R08: 0000000000000000 R09: 0000000000000089 [ 2.725671] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.725745] R13: ffffa87040577de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.725819] FS: 00000000348873c0(0000) GS:ffff967fd7f66000(0000) knlGS:0000000000000000 [ 2.725896] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.725959] CR2: 0000000000000000 CR3: 0000000003298006 CR4: 0000000000772ef0 [ 2.726038] PKRU: 55555554 [ 2.726070] note: packetdrill[227] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr