[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.402612] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.271890] random: sshd: uninitialized urandom read (32 bytes read) [ 25.585736] random: sshd: uninitialized urandom read (32 bytes read) [ 26.411135] random: sshd: uninitialized urandom read (32 bytes read) [ 26.568717] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.48' (ECDSA) to the list of known hosts. [ 32.181648] 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 executing program executing program executing program executing program executing program executing program [ 32.283372] BTRFS: device fsid ecf6f2a2-2997-48ae-b81e-1b00920efd9a devid 0 transid 0 /dev/loop0 executing program executing program executing program executing program executing program executing program executing program [ 32.369374] print_req_error: I/O error, dev loop1, sector 128 [ 32.376823] kasan: CONFIG_KASAN_INLINE enabled [ 32.381586] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 32.389263] general protection fault: 0000 [#1] SMP KASAN [ 32.394811] CPU: 0 PID: 4585 Comm: syz-executor809 Not tainted 4.18.0-rc1+ #108 [ 32.402264] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.411632] RIP: 0010:open_fs_devices+0x7f0/0xc80 [ 32.416474] 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 ab 03 00 00 48 8b 85 e0 fe ff ff 49 8d 7f 50 48 [ 32.435725] RSP: 0018:ffff8801d8fa71d8 EFLAGS: 00010206 [ 32.441192] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff82ca7517 [ 32.449333] RDX: 0000000000000014 RSI: ffffffff82ca7525 RDI: 00000000000000a0 [ 32.456609] RBP: ffff8801d8fa7348 R08: ffff8801d8bc8540 R09: ffff8801d8fa7240 [ 32.463884] R10: ffffed003b1f4e5c R11: ffff8801d8fa72e7 R12: ffff8801d8880d58 [ 32.471279] R13: ffff8801d8880cd8 R14: dffffc0000000000 R15: ffff8801d8880c80 [ 32.478556] FS: 0000000001c9a880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.486812] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.492698] CR2: 0000000000625208 CR3: 00000001d8a45000 CR4: 00000000001406f0 [ 32.499976] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.507249] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.514518] Call Trace: [ 32.517112] ? merge+0x250/0x250 [ 32.520494] ? do_raw_spin_unlock+0xa7/0x2f0 [ 32.524910] ? btrfs_update_device+0x650/0x650 [ 32.529606] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.534632] btrfs_open_devices+0xc0/0xd0 [ 32.538876] btrfs_mount_root+0x942/0x1e90 [ 32.543124] ? btrfs_decode_error+0x70/0x70 [ 32.547464] ? save_stack+0x43/0xd0 [ 32.551100] ? __kasan_slab_free+0x11a/0x170 [ 32.555519] ? kasan_slab_free+0xe/0x10 [ 32.559498] ? kfree+0xd9/0x260 [ 32.562782] ? mount_fs+0xae/0x328 [ 32.566351] ? vfs_kern_mount.part.34+0xdc/0x4e0 [ 32.571116] ? do_mount+0x581/0x30e0 [ 32.574840] ? ksys_mount+0x12d/0x140 [ 32.578651] ? __x64_sys_mount+0xbe/0x150 [ 32.582807] ? do_syscall_64+0x1b9/0x820 [ 32.586875] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.592337] ? kasan_check_read+0x11/0x20 [ 32.596511] ? do_raw_spin_unlock+0xa7/0x2f0 [ 32.601025] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 32.605620] ? do_raw_spin_lock+0xc1/0x200 [ 32.609863] mount_fs+0xae/0x328 [ 32.613235] ? debug_check_no_obj_freed+0x30b/0x595 [ 32.618259] vfs_kern_mount.part.34+0xdc/0x4e0 [ 32.622849] ? may_umount+0xb0/0xb0 [ 32.626479] ? kfree+0x111/0x260 [ 32.629853] ? btrfs_mount+0x84c/0x215e [ 32.633845] vfs_kern_mount+0x40/0x60 [ 32.638436] btrfs_mount+0x4a9/0x215e [ 32.642526] ? kasan_check_read+0x11/0x20 [ 32.646677] ? rcu_is_watching+0x8c/0x150 [ 32.650836] ? btrfs_remount+0x1710/0x1710 [ 32.655086] ? __lockdep_init_map+0x105/0x590 [ 32.659804] ? __lockdep_init_map+0x105/0x590 [ 32.664315] ? lockdep_init_map+0x9/0x10 [ 32.668389] ? __init_waitqueue_head+0x9e/0x150 [ 32.673070] ? init_wait_entry+0x1c0/0x1c0 [ 32.677313] ? memcpy+0x45/0x50 [ 32.680608] ? alloc_vfsmnt+0x779/0x9f0 [ 32.684675] ? mnt_free_id.isra.27+0x60/0x60 [ 32.689097] ? graph_lock+0x170/0x170 [ 32.692912] ? rcu_pm_notify+0xc0/0xc0 [ 32.696811] ? find_held_lock+0x36/0x1c0 [ 32.700887] ? lock_downgrade+0x8f0/0x8f0 [ 32.705045] mount_fs+0xae/0x328 [ 32.708436] ? btrfs_remount+0x1710/0x1710 [ 32.712678] ? mount_fs+0xae/0x328 [ 32.716231] ? mpi_free.cold.1+0x19/0x19 [ 32.720304] vfs_kern_mount.part.34+0xdc/0x4e0 [ 32.724894] ? may_umount+0xb0/0xb0 [ 32.728533] ? _raw_read_unlock+0x22/0x30 [ 32.732692] ? __get_fs_type+0x97/0xc0 [ 32.736589] do_mount+0x581/0x30e0 [ 32.740144] ? do_raw_spin_unlock+0xa7/0x2f0 [ 32.744565] ? copy_mount_string+0x40/0x40 [ 32.748827] ? copy_mount_options+0x5f/0x380 [ 32.753247] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.758283] ? kmem_cache_alloc_trace+0x616/0x780 [ 32.763140] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.768684] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.774231] ? copy_mount_options+0x285/0x380 [ 32.778734] ksys_mount+0x12d/0x140 [ 32.782376] __x64_sys_mount+0xbe/0x150 [ 32.786361] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.791383] do_syscall_64+0x1b9/0x820 [ 32.795277] ? syscall_return_slowpath+0x5e0/0x5e0 [ 32.800216] ? syscall_return_slowpath+0x31d/0x5e0 [ 32.805154] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.810527] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.815373] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.820545] RIP: 0033:0x446fca [ 32.823716] Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 1d aa 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 fa a9 fb ff c3 66 0f 1f 84 00 00 00 00 00 [ 32.842834] RSP: 002b:00007ffee8ad8698 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 [ 32.850522] RAX: ffffffffffffffda RBX: 00007ffee8ad86b0 RCX: 0000000000446fca [ 32.857770] RDX: 00007ffee8ad86b0 RSI: 00000000200000c0 RDI: 00007ffee8ad86d0 [ 32.865025] RBP: 0000000000000001 R08: 00007ffee8ad8710 R09: 000000000000000a [ 32.872275] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003 [ 32.879522] R13: 0000000000000004 R14: 0000000000000000 R15: 0000000000000001 [ 32.886770] Modules linked in: [ 32.889942] Dumping ftrace buffer: [ 32.893455] (ftrace buffer empty) [ 32.897252] ---[ end trace 9f351a86bc83ada4 ]--- [ 32.902049] RIP: 0010:open_fs_devices+0x7f0/0xc80 [ 32.906925] 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 ab 03 00 00 48 8b 85 e0 fe ff ff 49 8d 7f 50 48 [ 32.926259] RSP: 0018:ffff8801d8fa71d8 EFLAGS: 00010206 [ 32.931658] RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff82ca7517 [ 32.938953] RDX: 0000000000000014 RSI: ffffffff82ca7525 RDI: 00000000000000a0 [ 32.946243] RBP: ffff8801d8fa7348 R08: ffff8801d8bc8540 R09: ffff8801d8fa7240 [ 32.953536] R10: ffffed003b1f4e5c R11: ffff8801d8fa72e7 R12: ffff8801d8880d58 [ 32.960816] R13: ffff8801d8880cd8 R14: dffffc0000000000 R15: ffff8801d8880c80 [ 32.968132] FS: 0000000001c9a880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 32.976379] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.982273] CR2: 0000000000625208 CR3: 00000001d8a45000 CR4: 00000000001406f0 [ 32.989563] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.996846] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.004137] Kernel panic - not syncing: Fatal exception [ 33.010122] Dumping ftrace buffer: [ 33.013649] (ftrace buffer empty) [ 33.017344] Kernel Offset: disabled [ 33.020950] Rebooting in 86400 seconds..