[ 4.095318] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 4.095442] #PF: supervisor write access in kernel mode [ 4.095477] #PF: error_code(0x0002) - not-present page [ 4.095511] PGD 1b4b067 P4D 1b4b067 PUD 2f11067 PMD 0 [ 4.095551] Oops: Oops: 0002 [#1] SMP [ 4.095586] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 4.095650] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 4.095690] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 4.095738] 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 [ 4.095856] RSP: 0018:ffffb99dc057fcb8 EFLAGS: 00010046 [ 4.095895] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7b9a [ 4.095947] RDX: ffffb99dc057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 4.096005] RBP: ffffb99dc057fcf0 R08: 0000000000000000 R09: 000000000000025b [ 4.096064] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 4.096114] R13: ffffb99dc057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 4.096173] FS: 000000000eea43c0(0000) GS:ffff9f642c766000(0000) knlGS:0000000000000000 [ 4.096231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4.096274] CR2: 0000000000000000 CR3: 0000000002ec2004 CR4: 0000000000772ef0 [ 4.096323] PKRU: 55555554 [ 4.096343] Call Trace: [ 4.096361] [ 4.096379] __cancel_work+0x29/0xe0 [ 4.096410] ? dev_deactivate_many+0x2c9/0x300 [ 4.096450] __cancel_work_sync+0x16/0x80 [ 4.096480] __dev_close_many+0x11b/0x280 [ 4.096514] netif_close_many+0x98/0x160 [ 4.096544] unregister_netdevice_many_notify+0x1d8/0xa50 [ 4.096583] ? __queue_work+0x139/0x4e0 [ 4.096613] unregister_netdevice_queue+0xa0/0xe0 [ 4.096652] __tun_detach+0x45e/0x490 [ 4.096687] tun_chr_close+0x35/0xa0 [ 4.096716] __fput+0xda/0x290 [ 4.096751] __x64_sys_close+0x3d/0x80 [ 4.096784] do_syscall_64+0xa4/0xfd0 [ 4.096815] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 4.096852] RIP: 0033:0x4901eb [ 4.096886] 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 [ 4.097011] RSP: 002b:00007fff39c55390 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 4.097086] RAX: ffffffffffffffda RBX: 00007fff39c558e8 RCX: 00000000004901eb [ 4.097160] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 4.097213] RBP: 00007fff39c553d0 R08: 0000000000000000 R09: 0000000000000000 [ 4.097261] R10: 0000000000000010 R11: 0000000000000293 R12: 00007fff39c55868 [ 4.097310] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 4.097364] [ 4.097381] Modules linked in: [ 4.097412] CR2: 0000000000000000 [ 4.097441] ---[ end trace 0000000000000000 ]--- [ 4.097472] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 4.097508] 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 [ 4.097619] RSP: 0018:ffffb99dc057fcb8 EFLAGS: 00010046 [ 4.097656] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7b9a [ 4.097704] RDX: ffffb99dc057fcf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 4.097750] RBP: ffffb99dc057fcf0 R08: 0000000000000000 R09: 000000000000025b [ 4.097804] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 4.097850] R13: ffffb99dc057fde8 R14: 0000000000000020 R15: 0000000000000000 [ 4.097901] FS: 000000000eea43c0(0000) GS:ffff9f642c766000(0000) knlGS:0000000000000000 [ 4.097954] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4.097999] CR2: 0000000000000000 CR3: 0000000002ec2004 CR4: 0000000000772ef0 [ 4.098058] PKRU: 55555554 [ 4.098080] note: packetdrill[229] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr