[ 2.591452] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.591547] #PF: supervisor write access in kernel mode [ 2.591584] #PF: error_code(0x0002) - not-present page [ 2.591621] PGD 3eac067 P4D 3eac067 PUD 3e61067 PMD 0 [ 2.591664] Oops: Oops: 0002 [#1] SMP [ 2.591696] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.591763] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.591804] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.591850] 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 [ 2.591969] RSP: 0018:ffffb92d80597cb8 EFLAGS: 00010046 [ 2.592013] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb75c1 [ 2.592069] RDX: ffffb92d80597cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.592124] RBP: ffffb92d80597cf0 R08: 0000000000000000 R09: 0000000000000177 [ 2.592178] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.592233] R13: ffffb92d80597de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.592290] FS: 000000002b7a23c0(0000) GS:ffff94f22c166000(0000) knlGS:0000000000000000 [ 2.592348] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.592394] CR2: 0000000000000000 CR3: 0000000003ea8005 CR4: 0000000000772ef0 [ 2.592451] PKRU: 55555554 [ 2.592475] Call Trace: [ 2.592499] [ 2.592521] __cancel_work+0x29/0xe0 [ 2.592555] ? dev_deactivate_many+0x2c9/0x300 [ 2.592598] __cancel_work_sync+0x16/0x80 [ 2.592634] __dev_close_many+0x11b/0x280 [ 2.592669] netif_close_many+0x98/0x160 [ 2.592699] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.592741] ? __queue_work+0x139/0x4e0 [ 2.592775] unregister_netdevice_queue+0xa0/0xe0 [ 2.592812] __tun_detach+0x45e/0x490 [ 2.592844] tun_chr_close+0x35/0xa0 [ 2.592873] __fput+0xda/0x290 [ 2.592909] __x64_sys_close+0x3d/0x80 [ 2.592942] do_syscall_64+0xa4/0xfd0 [ 2.592977] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.593018] RIP: 0033:0x4901eb [ 2.593048] 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 [ 2.593168] RSP: 002b:00007fffcdc40500 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.593223] RAX: ffffffffffffffda RBX: 00007fffcdc40a58 RCX: 00000000004901eb [ 2.593278] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.593334] RBP: 00007fffcdc40540 R08: 0000000000000000 R09: 0000000000000000 [ 2.593390] R10: 0000000001000000 R11: 0000000000000293 R12: 00007fffcdc409d8 [ 2.593445] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.593502] [ 2.593523] Modules linked in: [ 2.593554] CR2: 0000000000000000 [ 2.593584] ---[ end trace 0000000000000000 ]--- [ 2.593624] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.593666] 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 [ 2.593785] RSP: 0018:ffffb92d80597cb8 EFLAGS: 00010046 [ 2.593823] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb75c1 [ 2.593878] RDX: ffffb92d80597cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.593933] RBP: ffffb92d80597cf0 R08: 0000000000000000 R09: 0000000000000177 [ 2.593988] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.594044] R13: ffffb92d80597de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.594094] FS: 000000002b7a23c0(0000) GS:ffff94f22c166000(0000) knlGS:0000000000000000 [ 2.594148] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.594193] CR2: 0000000000000000 CR3: 0000000003ea8005 CR4: 0000000000772ef0 [ 2.594249] PKRU: 55555554 [ 2.594272] note: packetdrill[229] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr