[ 2.222680] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.222767] #PF: supervisor write access in kernel mode [ 2.222805] #PF: error_code(0x0002) - not-present page [ 2.222838] PGD 1afc067 P4D 1afc067 PUD 37e6067 PMD 0 [ 2.222877] Oops: Oops: 0002 [#1] SMP [ 2.222910] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.222973] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.223017] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.223064] 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 [ 2.223189] RSP: 0018:ffffae66405d7cb8 EFLAGS: 00010046 [ 2.223228] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7453 [ 2.223282] RDX: ffffae66405d7cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.223332] RBP: ffffae66405d7cf0 R08: 0000000000000000 R09: 00000000000002d3 [ 2.223387] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.223436] R13: ffffae66405d7de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.223516] FS: 000000003f3333c0(0000) GS:ffff959488566000(0000) knlGS:0000000000000000 [ 2.223572] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.223617] CR2: 0000000000000000 CR3: 0000000001b03002 CR4: 0000000000772ef0 [ 2.223683] PKRU: 55555554 [ 2.223704] Call Trace: [ 2.223724] [ 2.223745] __cancel_work+0x29/0xe0 [ 2.223775] ? dev_deactivate_many+0x2c9/0x300 [ 2.223822] __cancel_work_sync+0x16/0x80 [ 2.223853] __dev_close_many+0x11b/0x280 [ 2.223885] netif_close_many+0x98/0x160 [ 2.223915] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.223953] ? __queue_work+0x139/0x4e0 [ 2.223984] unregister_netdevice_queue+0xa0/0xe0 [ 2.224021] __tun_detach+0x45e/0x490 [ 2.224053] tun_chr_close+0x35/0xa0 [ 2.224082] __fput+0xda/0x290 [ 2.224113] __x64_sys_close+0x3d/0x80 [ 2.224144] do_syscall_64+0xa4/0xfd0 [ 2.224190] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.224229] RIP: 0033:0x4901eb [ 2.224259] 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 [ 2.224381] RSP: 002b:00007ffce4d44660 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.224436] RAX: ffffffffffffffda RBX: 00007ffce4d44bb8 RCX: 00000000004901eb [ 2.224494] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.224544] RBP: 00007ffce4d446a0 R08: 0000000000000000 R09: 0000000000000000 [ 2.224598] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffce4d44b38 [ 2.224653] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.224713] [ 2.224729] Modules linked in: [ 2.224756] CR2: 0000000000000000 [ 2.224786] ---[ end trace 0000000000000000 ]--- [ 2.224823] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.224863] 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 [ 2.224979] RSP: 0018:ffffae66405d7cb8 EFLAGS: 00010046 [ 2.225012] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7453 [ 2.225061] RDX: ffffae66405d7cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.225111] RBP: ffffae66405d7cf0 R08: 0000000000000000 R09: 00000000000002d3 [ 2.225164] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.225219] R13: ffffae66405d7de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.225270] FS: 000000003f3333c0(0000) GS:ffff959488566000(0000) knlGS:0000000000000000 [ 2.225326] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.225373] CR2: 0000000000000000 CR3: 0000000001b03002 CR4: 0000000000772ef0 [ 2.225430] PKRU: 55555554 [ 2.225457] note: packetdrill[229] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr