[ 2.900212] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.900311] #PF: supervisor write access in kernel mode [ 2.900349] #PF: error_code(0x0002) - not-present page [ 2.900387] PGD 3b76067 P4D 3b76067 PUD 2f3e067 PMD 0 [ 2.900425] Oops: Oops: 0002 [#1] SMP [ 2.900450] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.900517] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.900573] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.900623] 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 [ 2.900756] RSP: 0018:ffffa78940537cb8 EFLAGS: 00010046 [ 2.900793] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb76f5 [ 2.900843] RDX: ffffa78940537cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.900896] RBP: ffffa78940537cf0 R08: 0000000000000000 R09: 0000000000000369 [ 2.900945] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.900994] R13: ffffa78940537de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.901045] FS: 000000000e71f3c0(0000) GS:ffff8db262366000(0000) knlGS:0000000000000000 [ 2.901098] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.901154] CR2: 0000000000000000 CR3: 000000000338f001 CR4: 0000000000772ef0 [ 2.901209] PKRU: 55555554 [ 2.901230] Call Trace: [ 2.901248] [ 2.901269] __cancel_work+0x29/0xe0 [ 2.901298] ? dev_deactivate_many+0x2c9/0x300 [ 2.901343] __cancel_work_sync+0x16/0x80 [ 2.901374] __dev_close_many+0x11b/0x280 [ 2.901404] netif_close_many+0x98/0x160 [ 2.901433] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.901472] ? __queue_work+0x139/0x4e0 [ 2.901500] unregister_netdevice_queue+0xa0/0xe0 [ 2.901539] __tun_detach+0x45e/0x490 [ 2.901573] tun_chr_close+0x35/0xa0 [ 2.901609] __fput+0xda/0x290 [ 2.901640] __x64_sys_close+0x3d/0x80 [ 2.901670] do_syscall_64+0xa4/0xfd0 [ 2.901708] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.901746] RIP: 0033:0x4901eb [ 2.901776] 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 [ 2.901893] RSP: 002b:00007fff2913c560 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.901942] RAX: ffffffffffffffda RBX: 00007fff2913cab8 RCX: 00000000004901eb [ 2.901996] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.902043] RBP: 00007fff2913c5a0 R08: 0000000000000000 R09: 0000000000000000 [ 2.902090] R10: 000000000e725da0 R11: 0000000000000293 R12: 00007fff2913ca38 [ 2.902146] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.902196] [ 2.902216] Modules linked in: [ 2.902241] CR2: 0000000000000000 [ 2.902265] ---[ end trace 0000000000000000 ]--- [ 2.902304] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.902343] 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 [ 2.902462] RSP: 0018:ffffa78940537cb8 EFLAGS: 00010046 [ 2.902500] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb76f5 [ 2.902549] RDX: ffffa78940537cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.902614] RBP: ffffa78940537cf0 R08: 0000000000000000 R09: 0000000000000369 [ 2.902665] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.902722] R13: ffffa78940537de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.902773] FS: 000000000e71f3c0(0000) GS:ffff8db262366000(0000) knlGS:0000000000000000 [ 2.902826] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.902872] CR2: 0000000000000000 CR3: 000000000338f001 CR4: 0000000000772ef0 [ 2.902921] PKRU: 55555554 [ 2.902944] note: packetdrill[229] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr