[ 6.348062] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 6.348136] #PF: supervisor write access in kernel mode [ 6.348177] #PF: error_code(0x0002) - not-present page [ 6.348216] PGD 5451067 P4D 5451067 PUD 3302067 PMD 0 [ 6.348253] Oops: Oops: 0002 [#1] SMP [ 6.348285] CPU: 3 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 6.348344] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 6.348384] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 6.348429] 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 [ 6.348545] RSP: 0018:ffffb16980557cb8 EFLAGS: 00010046 [ 6.348582] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb846f [ 6.348632] RDX: ffffb16980557cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 6.348684] RBP: ffffb16980557cf0 R08: 0000000000000000 R09: 00000000000003ea [ 6.348732] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 6.348781] R13: ffffb16980557de8 R14: 0000000000000020 R15: 0000000000000000 [ 6.348831] FS: 00000000075f13c0(0000) GS:ffffa02b9d966000(0000) knlGS:0000000000000000 [ 6.348887] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6.348931] CR2: 0000000000000000 CR3: 00000000054c4005 CR4: 0000000000772ef0 [ 6.348978] PKRU: 55555554 [ 6.348999] Call Trace: [ 6.349016] [ 6.349032] __cancel_work+0x29/0xe0 [ 6.349067] ? dev_deactivate_many+0x2c9/0x300 [ 6.349109] __cancel_work_sync+0x16/0x80 [ 6.349139] __dev_close_many+0x11b/0x280 [ 6.349176] netif_close_many+0x98/0x160 [ 6.349204] unregister_netdevice_many_notify+0x1d8/0xa50 [ 6.349240] ? __queue_work+0x139/0x4e0 [ 6.349271] unregister_netdevice_queue+0xa0/0xe0 [ 6.349308] __tun_detach+0x45e/0x490 [ 6.349338] tun_chr_close+0x35/0xa0 [ 6.349368] __fput+0xda/0x290 [ 6.349404] __x64_sys_close+0x3d/0x80 [ 6.349433] do_syscall_64+0xa4/0xfd0 [ 6.349467] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 6.349504] RIP: 0033:0x4901eb [ 6.349533] 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 [ 6.349664] RSP: 002b:00007ffdfdbbca50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 6.349718] RAX: ffffffffffffffda RBX: 00007ffdfdbbcfa8 RCX: 00000000004901eb [ 6.349771] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 6.349819] RBP: 00007ffdfdbbca90 R08: 0000000000000000 R09: 0000000000000000 [ 6.349868] R10: 00000000075f8140 R11: 0000000000000293 R12: 00007ffdfdbbcf28 [ 6.349925] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 6.349979] [ 6.350000] Modules linked in: [ 6.350024] CR2: 0000000000000000 [ 6.350062] ---[ end trace 0000000000000000 ]--- [ 6.350100] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 6.350136] 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 [ 6.350261] RSP: 0018:ffffb16980557cb8 EFLAGS: 00010046 [ 6.350298] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb846f [ 6.350350] RDX: ffffb16980557cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 6.350399] RBP: ffffb16980557cf0 R08: 0000000000000000 R09: 00000000000003ea [ 6.350452] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 6.350499] R13: ffffb16980557de8 R14: 0000000000000020 R15: 0000000000000000 [ 6.350547] FS: 00000000075f13c0(0000) GS:ffffa02b9d966000(0000) knlGS:0000000000000000 [ 6.350603] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 6.350646] CR2: 0000000000000000 CR3: 00000000054c4005 CR4: 0000000000772ef0 [ 6.350694] PKRU: 55555554 [ 6.350716] note: packetdrill[228] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr