[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.228' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 81.032073][ T8425] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program executing program [ 81.120950][ T8430] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. [ 81.168105][ T8435] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program executing program [ 81.236507][ T8440] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program [ 81.296741][ T8445] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. [ 81.357129][ T8450] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program [ 81.437404][ T8455] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program [ 81.506825][ T8460] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program executing program [ 81.586552][ T8465] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program [ 81.630026][ T8470] netlink: 4 bytes leftover after parsing attributes in process `syz-executor836'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 85.490155][ T8753] block nbd1: NBD_DISCONNECT [ 85.496031][ T8753] general protection fault, probably for non-canonical address 0xdffffc0000000027: 0000 [#1] PREEMPT SMP KASAN [ 85.507753][ T8753] KASAN: null-ptr-deref in range [0x0000000000000138-0x000000000000013f] [ 85.516158][ T8753] CPU: 0 PID: 8753 Comm: systemd-udevd Not tainted 5.12.0-rc6-syzkaller #0 [ 85.524743][ T8753] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.535013][ T8753] RIP: 0010:__lock_acquire+0xcfe/0x54c0 [ 85.540618][ T8753] Code: 0c 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 68 a4 0c 0e e9 81 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 31 00 00 49 81 3e c0 53 3b 8f 0f 84 d0 f3 ff [ 85.560969][ T8753] RSP: 0018:ffffc900020a7938 EFLAGS: 00010006 [ 85.567231][ T8753] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 85.575207][ T8753] RDX: 0000000000000027 RSI: 1ffff92000414f38 RDI: 0000000000000138 [ 85.583194][ T8753] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 85.591184][ T8753] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801f12d4c0 [ 85.599233][ T8753] R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 [ 85.607196][ T8753] FS: 00007f578b9f38c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 85.616121][ T8753] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 85.622722][ T8753] CR2: 00007ffc131aa498 CR3: 0000000020a2a000 CR4: 00000000001506f0 [ 85.630697][ T8753] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 85.638668][ T8753] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 85.646738][ T8753] Call Trace: [ 85.650037][ T8753] ? __lock_acquire+0xb43/0x54c0 [ 85.654983][ T8753] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 85.661014][ T8753] lock_acquire+0x1ab/0x740 [ 85.665522][ T8753] ? flush_workqueue+0xe1/0x13e0 [ 85.670478][ T8753] ? lock_release+0x720/0x720 [ 85.675159][ T8753] ? lockdep_init_map_type+0x2c3/0x7b0 [ 85.681094][ T8753] ? hctx_unlock+0xb9/0x170 [ 85.685612][ T8753] ? lockdep_init_map_type+0x2c3/0x7b0 [ 85.691221][ T8753] flush_workqueue+0x110/0x13e0 [ 85.697119][ T8753] ? flush_workqueue+0xe1/0x13e0 [ 85.702204][ T8753] ? lock_downgrade+0x6e0/0x6e0 [ 85.707062][ T8753] ? hctx_unlock+0xe4/0x170 [ 85.711676][ T8753] ? check_flush_dependency+0x400/0x400 [ 85.717761][ T8753] nbd_disconnect_and_put+0x94/0x120 [ 85.723084][ T8753] nbd_release+0x165/0x1a0 [ 85.727513][ T8753] ? nbd_genl_disconnect+0x540/0x540 [ 85.732898][ T8753] __blkdev_put+0x54e/0x800 [ 85.737407][ T8753] ? __mutex_unlock_slowpath+0xe2/0x610 [ 85.743200][ T8753] ? freeze_bdev+0x250/0x250 [ 85.748478][ T8753] ? wait_for_completion_io+0x270/0x270 [ 85.754419][ T8753] ? _raw_spin_unlock+0x24/0x40 [ 85.759497][ T8753] ? locks_remove_file+0x312/0x560 [ 85.764626][ T8753] blkdev_put+0x92/0x580 [ 85.769141][ T8753] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 85.775489][ T8753] blkdev_close+0x8c/0xb0 [ 85.779850][ T8753] __fput+0x288/0x920 [ 85.784096][ T8753] ? blkdev_put+0x580/0x580 [ 85.788617][ T8753] task_work_run+0xdd/0x1a0 [ 85.793141][ T8753] exit_to_user_mode_prepare+0x249/0x250 [ 85.798789][ T8753] syscall_exit_to_user_mode+0x19/0x60 [ 85.804366][ T8753] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 85.810278][ T8753] RIP: 0033:0x7f578ab39270 [ 85.814693][ T8753] Code: 73 01 c3 48 8b 0d 38 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 59 c1 20 00 00 75 10 b8 03 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 [ 85.834392][ T8753] RSP: 002b:00007ffcd33ecdd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 [ 85.843506][ T8753] RAX: 0000000000000000 RBX: 0000000000000007 RCX: 00007f578ab39270 [ 85.851749][ T8753] RDX: 000000000aba9500 RSI: 0000000000000000 RDI: 0000000000000007 [ 85.859726][ T8753] RBP: 00007f578b9f3710 R08: 0000563935ade5b0 R09: 0000000000000018 [ 85.867867][ T8753] R10: 0000563935accea8 R11: 0000000000000246 R12: 0000000000000000 [ 85.875865][ T8753] R13: 0000563935adb900 R14: 0000000000000003 R15: 000000000000000e [ 85.884645][ T8753] Modules linked in: [ 85.888852][ T8753] ---[ end trace 54cdb0b521450416 ]--- [ 85.894317][ T8753] RIP: 0010:__lock_acquire+0xcfe/0x54c0 [ 85.900219][ T8753] Code: 0c 0e 41 bf 01 00 00 00 0f 86 8c 00 00 00 89 05 68 a4 0c 0e e9 81 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 31 00 00 49 81 3e c0 53 3b 8f 0f 84 d0 f3 ff [ 85.920714][ T8753] RSP: 0018:ffffc900020a7938 EFLAGS: 00010006 [ 85.926779][ T8753] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 85.934784][ T8753] RDX: 0000000000000027 RSI: 1ffff92000414f38 RDI: 0000000000000138 [ 85.942759][ T8753] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 85.951895][ T8753] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88801f12d4c0 [ 85.960026][ T8753] R13: 0000000000000000 R14: 0000000000000138 R15: 0000000000000000 [ 85.968606][ T8753] FS: 00007f578b9f38c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 85.977634][ T8753] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 85.984573][ T8753] CR2: 00007ffc131aa498 CR3: 0000000020a2a000 CR4: 00000000001506f0 [ 85.992560][ T8753] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 86.000630][ T8753] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 86.008691][ T8753] Kernel panic - not syncing: Fatal exception [ 86.015482][ T8753] Kernel Offset: disabled [ 86.019927][ T8753] Rebooting in 86400 seconds..