[ 2.812915] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.813019] #PF: supervisor write access in kernel mode [ 2.813067] #PF: error_code(0x0002) - not-present page [ 2.813109] PGD 6d30067 P4D 6d30067 PUD 6d43067 PMD 0 [ 2.813150] Oops: Oops: 0002 [#1] SMP [ 2.813185] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.813267] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.813318] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.813369] 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 [ 2.813497] RSP: 0018:ffffc05a8055fcb8 EFLAGS: 00010046 [ 2.813539] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb769f [ 2.813598] RDX: ffffc05a8055fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.813656] RBP: ffffc05a8055fcf0 R08: 0000000000000000 R09: 0000000000000260 [ 2.813716] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.813769] R13: ffffc05a8055fde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.813824] FS: 0000000011b7d3c0(0000) GS:ffff9eed33766000(0000) knlGS:0000000000000000 [ 2.813895] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.813953] CR2: 0000000000000000 CR3: 0000000006d24002 CR4: 0000000000772ef0 [ 2.814020] PKRU: 55555554 [ 2.814043] Call Trace: [ 2.814063] [ 2.814088] __cancel_work+0x29/0xe0 [ 2.814129] ? dev_deactivate_many+0x2c9/0x300 [ 2.814175] __cancel_work_sync+0x16/0x80 [ 2.814208] __dev_close_many+0x11b/0x280 [ 2.814245] netif_close_many+0x98/0x160 [ 2.814279] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.814321] ? __queue_work+0x139/0x4e0 [ 2.814356] unregister_netdevice_queue+0xa0/0xe0 [ 2.814397] __tun_detach+0x45e/0x490 [ 2.814437] tun_chr_close+0x35/0xa0 [ 2.814470] __fput+0xda/0x290 [ 2.814505] __x64_sys_close+0x3d/0x80 [ 2.814539] do_syscall_64+0xa4/0xfd0 [ 2.814578] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.814622] RIP: 0033:0x4901eb [ 2.814657] 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 [ 2.814793] RSP: 002b:00007fff70511780 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.814854] RAX: ffffffffffffffda RBX: 00007fff70511cd8 RCX: 00000000004901eb [ 2.814927] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.814988] RBP: 00007fff705117c0 R08: 0000000000000000 R09: 0000000000000000 [ 2.815048] R10: 0000000002000000 R11: 0000000000000293 R12: 00007fff70511c58 [ 2.815104] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.815164] [ 2.815188] Modules linked in: [ 2.815222] CR2: 0000000000000000 [ 2.815255] ---[ end trace 0000000000000000 ]--- [ 2.815297] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.815338] 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 [ 2.815470] RSP: 0018:ffffc05a8055fcb8 EFLAGS: 00010046 [ 2.815510] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb769f [ 2.815569] RDX: ffffc05a8055fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.815628] RBP: ffffc05a8055fcf0 R08: 0000000000000000 R09: 0000000000000260 [ 2.815693] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.815752] R13: ffffc05a8055fde8 R14: 0000000000000020 R15: 0000000000000000 [ 2.815821] FS: 0000000011b7d3c0(0000) GS:ffff9eed33766000(0000) knlGS:0000000000000000 [ 2.815889] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.815945] CR2: 0000000000000000 CR3: 0000000006d24002 CR4: 0000000000772ef0 [ 2.816008] PKRU: 55555554 [ 2.816032] note: packetdrill[229] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr