[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.157' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 33.167524] block nbd0: NBD_DISCONNECT [ 33.172061] kasan: CONFIG_KASAN_INLINE enabled [ 33.176636] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 33.183978] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.190231] CPU: 0 PID: 8114 Comm: syz-executor340 Not tainted 4.19.211-syzkaller #0 [ 33.198088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 33.207515] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 33.212337] Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 20 f2 66 8c 0f 84 65 ff ff [ 33.231213] RSP: 0018:ffff8880951ff270 EFLAGS: 00010006 [ 33.236553] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 33.243797] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 33.251042] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 33.258287] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 33.265535] R13: ffff8880b1512500 R14: 0000000000000110 R15: 0000000000000001 [ 33.272785] FS: 000055555660b300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 33.281063] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.286934] CR2: 0000000020000040 CR3: 00000000a5e9e000 CR4: 00000000003406f0 [ 33.294201] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.301472] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.308731] Call Trace: [ 33.311303] ? __lock_acquire+0x6de/0x3ff0 [ 33.315517] ? mark_held_locks+0xf0/0xf0 [ 33.319556] ? __lock_acquire+0x6de/0x3ff0 [ 33.323768] ? mark_held_locks+0xf0/0xf0 [ 33.327805] ? __free_object+0xdd/0x1e0 [ 33.331758] ? mark_held_locks+0xf0/0xf0 [ 33.335799] ? mark_held_locks+0xa6/0xf0 [ 33.340116] lock_acquire+0x170/0x3c0 [ 33.343895] ? flush_workqueue+0xe8/0x13e0 [ 33.348109] flush_workqueue+0x117/0x13e0 [ 33.352233] ? flush_workqueue+0xe8/0x13e0 [ 33.356444] ? lock_downgrade+0x720/0x720 [ 33.360567] ? hctx_unlock+0x83/0x140 [ 33.364346] ? check_flush_dependency+0x400/0x400 [ 33.369171] nbd_disconnect_and_put+0x100/0x190 [ 33.373830] nbd_genl_disconnect+0x34f/0x4f0 [ 33.378216] ? nbd_release+0x170/0x170 [ 33.382194] ? nla_parse+0x1b2/0x290 [ 33.385899] genl_family_rcv_msg+0x642/0xc40 [ 33.390285] ? genl_rcv+0x40/0x40 [ 33.393716] ? genl_rcv_msg+0x12f/0x160 [ 33.397670] ? mutex_trylock+0x1a0/0x1a0 [ 33.401729] ? __radix_tree_lookup+0x216/0x370 [ 33.406302] genl_rcv_msg+0xbf/0x160 [ 33.409994] netlink_rcv_skb+0x160/0x440 [ 33.414034] ? genl_family_rcv_msg+0xc40/0xc40 [ 33.418598] ? netlink_ack+0xae0/0xae0 [ 33.422464] ? genl_rcv+0x15/0x40 [ 33.425893] genl_rcv+0x24/0x40 [ 33.429167] netlink_unicast+0x4d5/0x690 [ 33.433208] ? netlink_sendskb+0x110/0x110 [ 33.437435] ? _copy_from_iter_full+0x229/0x7c0 [ 33.442083] ? __phys_addr_symbol+0x2c/0x70 [ 33.446383] ? __check_object_size+0x17b/0x3e0 [ 33.450958] netlink_sendmsg+0x6c3/0xc50 [ 33.454995] ? aa_af_perm+0x230/0x230 [ 33.458774] ? nlmsg_notify+0x1f0/0x1f0 [ 33.462727] ? kernel_recvmsg+0x220/0x220 [ 33.466852] ? nlmsg_notify+0x1f0/0x1f0 [ 33.470802] sock_sendmsg+0xc3/0x120 [ 33.474493] ___sys_sendmsg+0x7bb/0x8e0 [ 33.478444] ? copy_msghdr_from_user+0x440/0x440 [ 33.483175] ? netlink_dump+0xc10/0xc10 [ 33.487126] ? nlmsg_notify+0x1f0/0x1f0 [ 33.491084] ? security_socket_recvmsg+0x8f/0xc0 [ 33.495831] ? __sys_recvfrom+0x2cd/0x3a0 [ 33.499953] ? __ia32_sys_send+0x100/0x100 [ 33.504166] ? __fdget+0x1a0/0x230 [ 33.507685] __x64_sys_sendmsg+0x132/0x220 [ 33.511907] ? __sys_sendmsg+0x1b0/0x1b0 [ 33.515948] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 33.521292] ? trace_hardirqs_off_caller+0x6e/0x210 [ 33.526287] ? do_syscall_64+0x21/0x620 [ 33.530240] do_syscall_64+0xf9/0x620 [ 33.534018] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.539184] RIP: 0033:0x7f1e809d11a9 [ 33.542874] Code: 28 c3 e8 5a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 33.561752] RSP: 002b:00007ffc00b8e578 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 33.569436] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1e809d11a9 [ 33.576701] RDX: 0000000000000000 RSI: 0000000020000400 RDI: 0000000000000004 [ 33.583948] RBP: 00007f1e809907d0 R08: 0000000000000000 R09: 0000000000000000 [ 33.591196] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1e80990860 [ 33.598458] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.605718] Modules linked in: [ 33.608907] ---[ end trace 18097ce5c81eeeff ]--- [ 33.613651] RIP: 0010:__lock_acquire+0x1eb/0x3ff0 [ 33.618472] Code: 2b 29 00 00 48 81 c4 98 01 00 00 44 89 f8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 b3 2a 00 00 49 81 3e 20 f2 66 8c 0f 84 65 ff ff [ 33.637368] RSP: 0018:ffff8880951ff270 EFLAGS: 00010006 [ 33.643068] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 33.650321] RDX: 0000000000000022 RSI: 0000000000000000 RDI: 0000000000000001 [ 33.657581] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 33.664827] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 33.672075] R13: ffff8880b1512500 R14: 0000000000000110 R15: 0000000000000001 [ 33.679323] FS: 000055555660b300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 33.687610] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.693556] CR2: 0000000020000040 CR3: 00000000a5e9e000 CR4: 00000000003406f0 [ 33.700818] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.708090] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.715337] Kernel panic - not syncing: Fatal exception [ 33.720841] Kernel Offset: disabled [ 33.724464] Rebooting in 86400 seconds..