[ 2.365436] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 2.365599] #PF: supervisor write access in kernel mode [ 2.365654] #PF: error_code(0x0002) - not-present page [ 2.365702] PGD 3307067 P4D 3307067 PUD 5510067 PMD 0 [ 2.365757] Oops: Oops: 0002 [#1] SMP [ 2.365801] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc5-virtme #1 PREEMPT(voluntary) [ 2.365890] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 2.365950] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.366011] 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 [ 2.366182] RSP: 0018:ffffc26740587cb8 EFLAGS: 00010046 [ 2.366246] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb74de [ 2.366326] RDX: ffffc26740587cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.366399] RBP: ffffc26740587cf0 R08: 0000000000000000 R09: 0000000000000367 [ 2.366469] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.366541] R13: ffffc26740587de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.366613] FS: 000000003e6cf3c0(0000) GS:ffff9e6dbf2e6000(0000) knlGS:0000000000000000 [ 2.366692] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.366755] CR2: 0000000000000000 CR3: 0000000005406005 CR4: 0000000000772ef0 [ 2.366821] PKRU: 55555554 [ 2.366851] Call Trace: [ 2.366877] [ 2.366909] __cancel_work+0x29/0xe0 [ 2.366951] ? dev_deactivate_many+0x2c9/0x300 [ 2.367006] __cancel_work_sync+0x16/0x80 [ 2.367049] __dev_close_many+0x11b/0x280 [ 2.367093] netif_close_many+0x98/0x160 [ 2.367136] unregister_netdevice_many_notify+0x1d8/0xa50 [ 2.367191] ? __queue_work+0x139/0x4e0 [ 2.367234] unregister_netdevice_queue+0xa0/0xe0 [ 2.367289] __tun_detach+0x45e/0x490 [ 2.367332] tun_chr_close+0x35/0xa0 [ 2.367375] __fput+0xda/0x290 [ 2.367418] __x64_sys_close+0x3d/0x80 [ 2.367461] do_syscall_64+0xa4/0xfd0 [ 2.367505] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 2.367561] RIP: 0033:0x4901eb [ 2.367604] 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 [ 2.367778] RSP: 002b:00007ffcba459470 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 2.367857] RAX: ffffffffffffffda RBX: 00007ffcba4599c8 RCX: 00000000004901eb [ 2.367928] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005 [ 2.368000] RBP: 00007ffcba4594b0 R08: 0000000000000000 R09: 0000000000000000 [ 2.368071] R10: 000000003e6d7360 R11: 0000000000000293 R12: 00007ffcba459948 [ 2.368150] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001 [ 2.368223] [ 2.368252] Modules linked in: [ 2.368289] CR2: 0000000000000000 [ 2.368325] ---[ end trace 0000000000000000 ]--- [ 2.368372] RIP: 0010:work_grab_pending+0x2f/0x1b0 [ 2.368426] 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 [ 2.368593] RSP: 0018:ffffc26740587cb8 EFLAGS: 00010046 [ 2.368641] RAX: 0000000000000246 RBX: 0000000000000000 RCX: 00000000fffb74de [ 2.368712] RDX: ffffc26740587cf0 RSI: 0000000000000000 RDI: 0000000000000000 [ 2.368783] RBP: ffffc26740587cf0 R08: 0000000000000000 R09: 0000000000000367 [ 2.368853] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 2.368924] R13: ffffc26740587de8 R14: 0000000000000020 R15: 0000000000000000 [ 2.368997] FS: 000000003e6cf3c0(0000) GS:ffff9e6dbf2e6000(0000) knlGS:0000000000000000 [ 2.369076] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 2.369142] CR2: 0000000000000000 CR3: 0000000005406005 CR4: 0000000000772ef0 [ 2.369215] PKRU: 55555554 [ 2.369247] note: packetdrill[228] exited with irqs disabled WAIT TIMEOUT stderr Ctrl-C stderr Ctrl-C stderr