[ 2.878660] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.878790] #PF: supervisor write access in kernel mode [ 2.878845] #PF: error_code(0x0002) - not-present page [ 2.878905] PGD 31cd067 P4D 31cd067 PUD 31d3067 PMD 0 [ 2.878973] Oops: Oops: 0002 [#1] SMP [ 2.879031] CPU: 0 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.879141] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.879221] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.879294] 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 [ 2.879502] RSP: 0018:ffffa28f40577cb8 EFLAGS: 00010046 [ 2.879558] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb76de [ 2.879645] RDX: ffffa28f40577cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.879732] RBP: ffffa28f40577cf0 R08: 0000000000000000 R09: 0000000000000130 [ 2.879819] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.879905] R13: ffffa28f40577de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.879993] FS: 000000001a8d23c0(0000) GS:ffff8b21753e6000(0000) knlGS:0000000000000000 [ 2.880087] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.880157] CR2: 0000000000000000 CR3: 00000000031d2004 CR4: 0000000000772ef0 [ 2.880245] PKRU: 55555554 [ 2.880281] Call Trace: [ 2.880313] [ 2.880349] __cancel_work+0x29/0xe0 [ 2.880398] ? dev_deactivate_many+0x2c9/0x300 [ 2.880470] __cancel_work_sync+0x16/0x80 [ 2.880521] __dev_close_many+0x11b/0x280 [ 2.880575] netif_close_many+0x98/0x160 [ 2.880618] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.880685] ? __queue_work+0x139/0x4e0 [ 2.880735] unregister_netdevice_queue+0xa0/0xe0 [ 2.880795] __tun_detach+0x45e/0x490 [ 2.880849] tun_chr_close+0x35/0xa0 [ 2.880898] __fput+0xda/0x290 [ 2.880952] __x64_sys_close+0x3d/0x80 [ 2.881003] do_syscall_64+0xa4/0xfd0 [ 2.881053] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.881110] RIP: 0033:0x4901eb [ 2.881159] 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 [ 2.881364] RSP: 002b:00007fff4ff27940 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.881451] RAX: ffffffffffffffda RBX: 00007fff4ff27e98 RCX: 00000000004901eb [ 2.881537] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.881624] RBP: 00007fff4ff27980 R08: 0000000000000000 R09: 0000000000000000 [ 2.881710] R10: 000000001a8edf20 R11: 0000000000000293 R12: 00007fff4ff27e18 [ 2.881795] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.881883] [ 2.881910] Modules linked in: [ 2.881954] CR2: 0000000000000000 [ 2.881996] ---[ end trace 0000000000000000 ]--- [ 2.882055] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.882120] 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 [ 2.882320] RSP: 0018:ffffa28f40577cb8 EFLAGS: 00010046 [ 2.882376] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb76de [ 2.882463] RDX: ffffa28f40577cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.882549] RBP: ffffa28f40577cf0 R08: 0000000000000000 R09: 0000000000000130 [ 2.882639] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.882728] R13: ffffa28f40577de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.882818] FS: 000000001a8d23c0(0000) GS:ffff8b21753e6000(0000) knlGS:0000000000000000 [ 2.882915] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.882996] CR2: 0000000000000000 CR3: 00000000031d2004 CR4: 0000000000772ef0 [ 2.883086] PKRU: 55555554 [ 2.883126] note: packetdrill[229] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr