[ 2.212726] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.212859] #PF: supervisor write access in kernel mode [ 2.212894] #PF: error_code(0x0002) - not-present page [ 2.212924] PGD 3329067 P4D 3329067 PUD 31d4067 PMD 0 [ 2.212961] Oops: Oops: 0002 [#1] SMP [ 2.212990] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.213050] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.213094] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.213139] 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 [ 2.213247] RSP: 0018:ffffbaca40577cb8 EFLAGS: 00010046 [ 2.213283] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7445 [ 2.213338] RDX: ffffbaca40577cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.213382] RBP: ffffbaca40577cf0 R08: 0000000000000000 R09: 00000000000000cf [ 2.213426] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.213470] R13: ffffbaca40577de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.213515] FS: 00000000222473c0(0000) GS:ffff9ef2398e6000(0000) knlGS:0000000000000000 [ 2.213568] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.213609] CR2: 0000000000000000 CR3: 00000000040fd005 CR4: 0000000000772ef0 [ 2.213654] PKRU: 55555554 [ 2.213673] Call Trace: [ 2.213691] [ 2.213710] __cancel_work+0x29/0xe0 [ 2.213743] ? dev_deactivate_many+0x2c9/0x300 [ 2.213785] __cancel_work_sync+0x16/0x80 [ 2.213813] __dev_close_many+0x11b/0x280 [ 2.213842] netif_close_many+0x98/0x160 [ 2.213869] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.213903] ? __queue_work+0x139/0x4e0 [ 2.213931] unregister_netdevice_queue+0xa0/0xe0 [ 2.213966] __tun_detach+0x45e/0x490 [ 2.213994] tun_chr_close+0x35/0xa0 [ 2.214021] __fput+0xda/0x290 [ 2.214050] __x64_sys_close+0x3d/0x80 [ 2.214077] do_syscall_64+0xa4/0xfd0 [ 2.214109] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.214143] RIP: 0033:0x4901eb [ 2.214171] 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 [ 2.214279] RSP: 002b:00007ffe34989770 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.214328] RAX: ffffffffffffffda RBX: 00007ffe34989cc8 RCX: 00000000004901eb [ 2.214377] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.214421] RBP: 00007ffe349897b0 R08: 0000000000000000 R09: 0000000000000000 [ 2.214465] R10: 000000002224f130 R11: 0000000000000293 R12: 00007ffe34989c48 [ 2.214509] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.214553] [ 2.214573] Modules linked in: [ 2.214602] CR2: 0000000000000000 [ 2.214629] ---[ end trace 0000000000000000 ]--- [ 2.214664] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.214699] 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 [ 2.214807] RSP: 0018:ffffbaca40577cb8 EFLAGS: 00010046 [ 2.214842] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb7445 [ 2.214886] RDX: ffffbaca40577cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.214930] RBP: ffffbaca40577cf0 R08: 0000000000000000 R09: 00000000000000cf [ 2.214973] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.215017] R13: ffffbaca40577de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.215062] FS: 00000000222473c0(0000) GS:ffff9ef2398e6000(0000) knlGS:0000000000000000 [ 2.215112] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.215153] CR2: 0000000000000000 CR3: 00000000040fd005 CR4: 0000000000772ef0 [ 2.215199] PKRU: 55555554 [ 2.215222] note: packetdrill[228] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr