[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.724756] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.004084] random: sshd: uninitialized urandom read (32 bytes read) [ 20.380263] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.126195] random: sshd: uninitialized urandom read (32 bytes read) [ 21.283328] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 26.723596] random: sshd: uninitialized urandom read (32 bytes read) 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 [ 26.823715] BTRFS: device fsid ecf6f2a2-2997-48ae-b81e-1b00920efd9a devid 0 transid 0 /dev/loop0 executing program executing program [ 26.869380] print_req_error: I/O error, dev loop1, sector 128 [ 26.881591] kasan: CONFIG_KASAN_INLINE enabled [ 26.886438] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 26.894108] general protection fault: 0000 [#1] SMP KASAN [ 26.899656] CPU: 0 PID: 4540 Comm: syz-executor962 Not tainted 4.17.0+ #86 [ 26.906662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.916031] RIP: 0010:open_fs_devices+0x7e8/0xc60 [ 26.920862] Code: 48 8b 85 e0 fe ff ff 41 c7 87 14 01 00 00 01 00 00 00 48 8d b8 a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 01 04 00 00 48 8b 85 e0 fe ff ff 49 8d 7f 50 48 [ 26.940106] RSP: 0018:ffff8801d06971d8 EFLAGS: 00010206 [ 26.945473] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff82c386af [ 26.952744] RDX: 0000000000000014 RSI: ffffffff82c386bd RDI: 00000000000000a0 [ 26.960015] RBP: ffff8801d0697348 R08: ffff8801ad4fc580 R09: ffff8801d0697240 [ 26.967287] R10: ffffed003a0d2e5c R11: ffff8801d06972e7 R12: ffff8801ad4f8158 [ 26.974561] R13: ffff8801ad4f80d8 R14: dffffc0000000000 R15: ffff8801ad4f8080 [ 26.981836] FS: 00000000017dd880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 26.990062] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.995948] CR2: 0000000000ede000 CR3: 00000001adaac000 CR4: 00000000001406f0 [ 27.003225] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.010498] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.017764] Call Trace: [ 27.020356] ? merge+0x240/0x240 [ 27.023725] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.028138] ? btrfs_update_device+0x640/0x640 [ 27.032733] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.037758] btrfs_open_devices+0xc0/0xd0 [ 27.041911] btrfs_mount_root+0x91f/0x1e70 [ 27.046165] ? btrfs_decode_error+0x70/0x70 [ 27.050493] ? save_stack+0x43/0xd0 [ 27.054127] ? __kasan_slab_free+0x11a/0x170 [ 27.058540] ? kasan_slab_free+0xe/0x10 [ 27.062514] ? kfree+0xd9/0x260 [ 27.065796] ? mount_fs+0xae/0x328 [ 27.069337] ? vfs_kern_mount.part.34+0xd4/0x4d0 [ 27.074095] ? do_mount+0x564/0x30b0 [ 27.077803] ? ksys_mount+0x12d/0x140 [ 27.082438] ? __x64_sys_mount+0xbe/0x150 [ 27.086606] ? do_syscall_64+0x1b1/0x800 [ 27.090654] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.095995] ? kasan_check_read+0x11/0x20 [ 27.100124] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.104512] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 27.109070] ? kasan_check_write+0x14/0x20 [ 27.113288] ? do_raw_spin_lock+0xc1/0x200 [ 27.117499] mount_fs+0xae/0x328 [ 27.120851] ? debug_check_no_obj_freed+0x2ff/0x584 [ 27.125843] vfs_kern_mount.part.34+0xd4/0x4d0 [ 27.130400] ? may_umount+0xb0/0xb0 [ 27.134010] ? quarantine_put+0xeb/0x190 [ 27.138063] ? kfree+0x111/0x260 [ 27.141412] ? btrfs_mount+0x831/0x213e [ 27.145364] vfs_kern_mount+0x40/0x60 [ 27.149158] btrfs_mount+0x4a1/0x213e [ 27.152935] ? kasan_check_read+0x11/0x20 [ 27.157061] ? rcu_is_watching+0x85/0x140 [ 27.161187] ? btrfs_remount+0x16f0/0x16f0 [ 27.165398] ? __lockdep_init_map+0x105/0x590 [ 27.169869] ? __lockdep_init_map+0x105/0x590 [ 27.174347] ? lockdep_init_map+0x9/0x10 [ 27.178394] ? __init_waitqueue_head+0x96/0x140 [ 27.183040] ? init_wait_entry+0x1b0/0x1b0 [ 27.187250] ? memcpy+0x45/0x50 [ 27.190506] ? alloc_vfsmnt+0x771/0x9d0 [ 27.194458] ? mnt_free_id.isra.27+0x60/0x60 [ 27.198843] ? kasan_check_read+0x11/0x20 [ 27.202967] ? graph_lock+0x170/0x170 [ 27.206750] ? rcu_pm_notify+0xc0/0xc0 [ 27.210622] ? trace_hardirqs_off+0xd/0x10 [ 27.214838] ? putname+0xf2/0x130 [ 27.218268] ? find_held_lock+0x36/0x1c0 [ 27.222317] ? lock_downgrade+0x8e0/0x8e0 [ 27.226449] ? module_unload_free+0x5b0/0x5b0 [ 27.230922] mount_fs+0xae/0x328 [ 27.234265] ? btrfs_remount+0x16f0/0x16f0 [ 27.238477] ? mount_fs+0xae/0x328 [ 27.241998] ? mpi_free.cold.1+0x19/0x19 [ 27.246042] vfs_kern_mount.part.34+0xd4/0x4d0 [ 27.250607] ? may_umount+0xb0/0xb0 [ 27.254213] ? _raw_read_unlock+0x22/0x30 [ 27.258335] ? __get_fs_type+0x97/0xc0 [ 27.262200] do_mount+0x564/0x30b0 [ 27.265725] ? do_raw_spin_unlock+0x9e/0x2e0 [ 27.270109] ? copy_mount_string+0x40/0x40 [ 27.274322] ? rcu_pm_notify+0xc0/0xc0 [ 27.278189] ? copy_mount_options+0x5f/0x380 [ 27.282576] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.287568] ? kmem_cache_alloc_trace+0x616/0x780 [ 27.292389] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 27.297915] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.303436] ? copy_mount_options+0x285/0x380 [ 27.307908] ksys_mount+0x12d/0x140 [ 27.311512] __x64_sys_mount+0xbe/0x150 [ 27.315466] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.320461] do_syscall_64+0x1b1/0x800 [ 27.324329] ? syscall_return_slowpath+0x5c0/0x5c0 [ 27.329244] ? syscall_return_slowpath+0x30f/0x5c0 [ 27.334156] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 27.339504] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.344331] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.349495] RIP: 0033:0x4431fa [ 27.352659] Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fd e5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da e5 fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 27.371775] RSP: 002b:00007ffc2d953358 EFLAGS: 00000297 ORIG_RAX: 00000000000000a5 [ 27.379460] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004431fa [ 27.386715] RDX: 0000000020000080 RSI: 0000000020000040 RDI: 00007ffc2d953370 [ 27.393960] RBP: 0000000000000004 R08: 00000000200000c0 R09: 000000000000000a [ 27.401213] R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000000d [ 27.408460] R13: 0000000008100000 R14: 0030656c69662f2e R15: fe03f80fe03f80ff [ 27.415708] Modules linked in: [ 27.418884] Dumping ftrace buffer: [ 27.422396] (ftrace buffer empty) [ 27.426267] ---[ end trace d8b96c29a3ffd356 ]--- [ 27.431062] RIP: 0010:open_fs_devices+0x7e8/0xc60 [ 27.435925] Code: 48 8b 85 e0 fe ff ff 41 c7 87 14 01 00 00 01 00 00 00 48 8d b8 a0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 01 04 00 00 48 8b 85 e0 fe ff ff 49 8d 7f 50 48 [ 27.455200] RSP: 0018:ffff8801d06971d8 EFLAGS: 00010206 [ 27.460602] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff82c386af [ 27.467900] RDX: 0000000000000014 RSI: ffffffff82c386bd RDI: 00000000000000a0 [ 27.475191] RBP: ffff8801d0697348 R08: ffff8801ad4fc580 R09: ffff8801d0697240 [ 27.482482] R10: ffffed003a0d2e5c R11: ffff8801d06972e7 R12: ffff8801ad4f8158 [ 27.489766] R13: ffff8801ad4f80d8 R14: dffffc0000000000 R15: ffff8801ad4f8080 [ 27.497051] FS: 00000000017dd880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 27.505279] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.511290] CR2: 0000000000ede000 CR3: 00000001adaac000 CR4: 00000000001406f0 [ 27.518622] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.525896] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.533167] Kernel panic - not syncing: Fatal exception [ 27.538988] Dumping ftrace buffer: [ 27.542511] (ftrace buffer empty) [ 27.546195] Kernel Offset: disabled [ 27.549797] Rebooting in 86400 seconds..