[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.249251] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 11.336421] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 57.481014] kasan: CONFIG_KASAN_INLINE enabled [ 57.481830] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 57.482924] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 57.483752] Modules linked in: [ 57.484233] CPU: 1 PID: 2092 Comm: syz-executor816 Not tainted 4.9.155+ #27 [ 57.485243] task: ffff8801d01d8000 task.stack: ffff8801cded0000 [ 57.486046] RIP: 0010:[] [] blk_get_backing_dev_info+0x4a/0x70 [ 57.487308] RSP: 0018:ffff8801cded76c8 EFLAGS: 00010206 [ 57.488054] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff10039bdaf0a [ 57.489029] RDX: 00000000000000a6 RSI: ffffffff81ac468d RDI: 0000000000000530 [ 57.490123] RBP: ffff8801cded76d0 R08: 0000000000000000 R09: 0000000000000001 [ 57.491183] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea000737a0c0 [ 57.492284] R13: ffff8801d9188948 R14: ffff8801d9188750 R15: ffffffff833ef0f8 [ 57.493382] FS: 0000000000f36880(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 57.494624] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 57.495468] CR2: 000000000049f400 CR3: 0000000003022000 CR4: 00000000001606b0 [ 57.496485] Stack: [ 57.496806] ffff8801da48a200 ffff8801cded7710 ffffffff81434c92 ffff8801d9188948 [ 57.498052] ffff8801d9188948 ffffea000737a0c0 ffffea000737a0e0 ffff8801d9188948 [ 57.499212] 0000000000000000 ffff8801cded7740 ffffffff814411e0 dffffc0000000000 [ 57.500412] Call Trace: [ 57.500795] [] cancel_dirty_page+0x1a2/0x3d0 [ 57.504790] [] truncate_inode_page+0x130/0x260 [ 57.511000] [] truncate_inode_pages_range+0x20e/0xfe0 [ 57.517818] [] ? generic_error_remove_page+0xb0/0xb0 [ 57.524553] [] ? trace_hardirqs_on+0x10/0x10 [ 57.530588] [] ? trace_hardirqs_on+0x10/0x10 [ 57.536626] [] ? mark_held_locks+0xb1/0x100 [ 57.542639] [] ? truncate_inode_pages_final+0x9a/0xc0 [ 57.549462] [] ? _raw_spin_unlock_irq+0x28/0x60 [ 57.555761] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 57.562588] [] truncate_inode_pages_final+0x81/0xc0 [ 57.569243] [] bdev_evict_inode+0x21/0x190 [ 57.575104] [] ? bdev_set+0x80/0x80 [ 57.580369] [] evict+0x2e9/0x630 [ 57.585359] [] ? find_inode_nowait+0x180/0x180 [ 57.591563] [] iput+0x370/0x900 [ 57.596467] [] bd_forget+0xf0/0x1a0 [ 57.601823] [] evict+0x485/0x630 [ 57.606814] [] ? find_inode_nowait+0x180/0x180 [ 57.613021] [] iput+0x370/0x900 [ 57.617922] [] dentry_unlink_inode+0x277/0x330 [ 57.624129] [] __dentry_kill+0x333/0x580 [ 57.629937] [] ? dput.part.0+0x2a/0x7c0 [ 57.635538] [] ? dput.part.0+0x2a/0x7c0 [ 57.641196] [] dput.part.0+0x5d9/0x7c0 [ 57.646725] [] ? dput.part.0+0x2a/0x7c0 [ 57.652326] [] do_one_tree+0x44/0x50 [ 57.657662] [] shrink_dcache_for_umount+0x67/0x160 [ 57.664221] [] generic_shutdown_super+0x6d/0x300 [ 57.670605] [] kill_anon_super+0x3f/0x60 [ 57.676291] [] fuse_kill_sb_anon+0x42/0x50 [ 57.682162] [] deactivate_locked_super+0x79/0xe0 [ 57.688594] [] deactivate_super+0x8a/0xb0 [ 57.694380] [] cleanup_mnt+0xb2/0x160 [ 57.699807] [] __cleanup_mnt+0x16/0x20 [ 57.705321] [] task_work_run+0x108/0x180 [ 57.711007] [] do_exit+0x78b/0x2aa0 [ 57.716256] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 57.722982] [] ? release_task+0x14a0/0x14a0 [ 57.728935] [] ? __do_page_fault+0x41e/0xa60 [ 57.734974] [] ? up_read+0x1a/0x40 [ 57.740141] [] ? __do_page_fault+0x545/0xa60 [ 57.746174] [] do_group_exit+0x111/0x300 [ 57.751975] [] SyS_exit_group+0x1d/0x20 [ 57.757578] [] ? do_group_exit+0x300/0x300 [ 57.763446] [] do_syscall_64+0x1ad/0x570 [ 57.769178] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 57.776082] Code: 89 fa 48 c1 ea 03 80 3c 02 00 75 35 48 8b 9b e0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 30 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 17 48 8b 83 30 05 00 00 5b 5d 48 05 20 02 00 00 [ 57.802997] RIP [] blk_get_backing_dev_info+0x4a/0x70 [ 57.809939] RSP [ 57.815122] ---[ end trace c0e9ac57524983b2 ]--- [ 57.819868] Kernel panic - not syncing: Fatal exception [ 57.825503] Kernel Offset: disabled [ 57.829105] Rebooting in 86400 seconds..