[ 2.878601] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.878712] #PF: supervisor write access in kernel mode [ 2.878747] #PF: error_code(0x0002) - not-present page [ 2.878783] PGD 3f74067 P4D 3f74067 PUD 3036067 PMD 0 [ 2.878826] Oops: Oops: 0002 [#1] SMP [ 2.878862] CPU: 2 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.878922] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.878963] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.879006] 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 [ 2.879128] RSP: 0018:ffffa674c05bfcb8 EFLAGS: 00010046 [ 2.879163] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb76d9 [ 2.879213] RDX: ffffa674c05bfcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.879260] RBP: ffffa674c05bfcf0 R08: 0000000000000000 R09: 00000000000000d0 [ 2.879304] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.879348] R13: ffffa674c05bfde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.879394] FS: 000000001257c3c0(0000) GS:ffff97a44d6e6000(0000) knlGS:0000000000000000 [ 2.879446] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.879487] CR2: 0000000000000000 CR3: 0000000003eeb001 CR4: 0000000000772ef0 [ 2.879532] PKRU: 55555554 [ 2.879551] Call Trace: [ 2.879573] [ 2.879598] __cancel_work+0x29/0xe0 [ 2.879628] ? dev_deactivate_many+0x2c9/0x300 [ 2.879667] __cancel_work_sync+0x16/0x80 [ 2.879694] __dev_close_many+0x11b/0x280 [ 2.879732] netif_close_many+0x98/0x160 [ 2.879759] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.879796] ? __queue_work+0x139/0x4e0 [ 2.879833] unregister_netdevice_queue+0xa0/0xe0 [ 2.879869] __tun_detach+0x45e/0x490 [ 2.879899] tun_chr_close+0x35/0xa0 [ 2.879924] __fput+0xda/0x290 [ 2.879960] __x64_sys_close+0x3d/0x80 [ 2.879987] do_syscall_64+0xa4/0xfd0 [ 2.880017] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.880051] RIP: 0033:0x4901eb [ 2.880083] 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 [ 2.880199] RSP: 002b:00007ffdebdbd660 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.880249] RAX: ffffffffffffffda RBX: 00007ffdebdbdbb8 RCX: 00000000004901eb [ 2.880298] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.880343] RBP: 00007ffdebdbd6a0 R08: 0000000000000000 R09: 0000000000000000 [ 2.880387] R10: 0000000012584530 R11: 0000000000000293 R12: 00007ffdebdbdb38 [ 2.880439] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.880484] [ 2.880504] Modules linked in: [ 2.880535] CR2: 0000000000000000 [ 2.880560] ---[ end trace 0000000000000000 ]--- [ 2.880595] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.880630] 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 [ 2.880739] RSP: 0018:ffffa674c05bfcb8 EFLAGS: 00010046 [ 2.880768] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb76d9 [ 2.880821] RDX: ffffa674c05bfcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.880871] RBP: ffffa674c05bfcf0 R08: 0000000000000000 R09: 00000000000000d0 [ 2.880915] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.880959] R13: ffffa674c05bfde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.881010] FS: 000000001257c3c0(0000) GS:ffff97a44d6e6000(0000) knlGS:0000000000000000 [ 2.881060] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.881109] CR2: 0000000000000000 CR3: 0000000003eeb001 CR4: 0000000000772ef0 [ 2.881154] PKRU: 55555554 [ 2.881175] note: packetdrill[230] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr