[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 10.455146] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 13.468111] random: crng init done Warning: Permanently added '10.128.0.91' (ECDSA) to the list of known hosts. [ 20.208331] kasan: CONFIG_KASAN_INLINE enabled [ 20.212923] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.220314] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.226533] Modules linked in: [ 20.229825] CPU: 1 PID: 2043 Comm: syz-executor521 Not tainted 4.9.194+ #0 [ 20.236813] task: 0000000000a98544 task.stack: 00000000a68fd96b [ 20.242855] RIP: 0010:[] [<00000000e3e86a92>] blk_get_backing_dev_info+0x4a/0x70 [ 20.252141] RSP: 0018:ffff8801cf3076c8 EFLAGS: 00010206 [ 20.257563] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff10039e60f0a [ 20.264807] RDX: 00000000000000a6 RSI: ffffffff81ae5d3d RDI: 0000000000000530 [ 20.272054] RBP: ffff8801cf3076d0 R08: 0000000000000000 R09: 0000000000000001 [ 20.279303] R10: 0000000000000001 R11: 0000000000000001 R12: ffffea00073da200 [ 20.286549] R13: ffff8801d476c888 R14: ffff8801d476c690 R15: ffffffff833f1db8 [ 20.293793] FS: 0000000001f08880(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 20.302035] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 20.307890] CR2: 000000000049f500 CR3: 0000000003026000 CR4: 00000000001606b0 [ 20.315177] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.322424] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.329667] Stack: [ 20.331827] ffff8801da49a200 ffff8801cf307710 ffffffff8143e202 ffff8801d476c888 [ 20.339849] ffff8801d476c888 ffffea00073da200 ffffea00073da220 ffff8801d476c888 [ 20.347892] 0000000000000000 ffff8801cf307740 ffffffff8144a790 dffffc0000000000 [ 20.355927] Call Trace: [ 20.358496] [<0000000035f25f36>] cancel_dirty_page+0x1a2/0x3d0 [ 20.364528] [<0000000074aee529>] truncate_inode_page+0x130/0x260 [ 20.370735] [<00000000fe7a56ba>] truncate_inode_pages_range+0x20e/0xfe0 [ 20.377561] [<00000000efe10766>] ? generic_error_remove_page+0xb0/0xb0 [ 20.384290] [<00000000d2607c51>] ? trace_hardirqs_on+0x10/0x10 [ 20.390324] [<00000000d2607c51>] ? trace_hardirqs_on+0x10/0x10 [ 20.396355] [<00000000c555e079>] ? mark_held_locks+0xb1/0x100 [ 20.402303] [<000000002109d63c>] ? truncate_inode_pages_final+0x9a/0xc0 [ 20.409117] [<0000000092736325>] ? _raw_spin_unlock_irq+0x28/0x60 [ 20.415410] [<00000000578df7ce>] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 20.422224] [<0000000027bd6642>] truncate_inode_pages_final+0x81/0xc0 [ 20.428865] [<0000000008d53e93>] bdev_evict_inode+0x21/0x190 [ 20.434722] [<000000009c50a902>] ? bdev_set+0x80/0x80 [ 20.439972] [<000000009aea899a>] evict+0x2e9/0x630 [ 20.444960] [<00000000d982a4bb>] ? find_inode_nowait+0x180/0x180 [ 20.451165] [<00000000d9fb2b34>] iput+0x370/0x900 [ 20.456427] [<00000000ef614325>] bd_forget+0xf0/0x1a0 [ 20.461694] [<000000004fa6049d>] evict+0x485/0x630 [ 20.466689] [<00000000d982a4bb>] ? find_inode_nowait+0x180/0x180 [ 20.472900] [<00000000d9fb2b34>] iput+0x370/0x900 [ 20.477808] [<00000000e49cb3e8>] dentry_unlink_inode+0x277/0x330 [ 20.484016] [<000000005c849b1e>] __dentry_kill+0x333/0x580 [ 20.489713] [<0000000035765ce1>] ? dput.part.0+0x2a/0x7c0 [ 20.495312] [<0000000035765ce1>] ? dput.part.0+0x2a/0x7c0 [ 20.501007] [<00000000b807dca8>] dput.part.0+0x5d9/0x7c0 [ 20.506518] [<0000000035765ce1>] ? dput.part.0+0x2a/0x7c0 [ 20.512154] [<00000000324367b9>] do_one_tree+0x44/0x50 [ 20.517492] [<00000000c3cfac58>] shrink_dcache_for_umount+0x67/0x160 [ 20.524046] [<00000000f18392b0>] generic_shutdown_super+0x6d/0x300 [ 20.530423] [<00000000380acbae>] kill_anon_super+0x3f/0x60 [ 20.536105] [<00000000d1518128>] fuse_kill_sb_anon+0x42/0x50 [ 20.541961] [<0000000014368a59>] deactivate_locked_super+0x79/0xe0 [ 20.548341] [<00000000f8c2be77>] deactivate_super+0x8a/0xb0 [ 20.554109] [<00000000fcebe4a1>] cleanup_mnt+0xb2/0x160 [ 20.559530] [<00000000a5842d7a>] __cleanup_mnt+0x16/0x20 [ 20.565042] [<000000005841f59d>] task_work_run+0x108/0x180 [ 20.570729] [<00000000f2cf76d3>] do_exit+0x78f/0x2aa0 [ 20.575978] [<000000000463bb77>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 20.582724] [<000000005af5a28b>] ? release_task+0x14a0/0x14a0 [ 20.588670] [<00000000a0965594>] ? __do_page_fault+0x41e/0xa60 [ 20.594698] [<000000003cdb1e2a>] ? up_read+0x1a/0x40 [ 20.599859] [<0000000020979564>] ? __do_page_fault+0x545/0xa60 [ 20.605887] [<00000000714fc9f2>] do_group_exit+0x111/0x300 [ 20.611591] [<000000005d1bb262>] SyS_exit_group+0x1d/0x20 [ 20.617215] [<00000000ebb7d4f3>] ? do_group_exit+0x300/0x300 [ 20.617222] [<0000000081938096>] do_syscall_64+0x1ad/0x5c0 [ 20.617230] [<000000006c9aeff4>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 20.617339] 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 [ 20.617348] RIP [<00000000e3e86a92>] blk_get_backing_dev_info+0x4a/0x70 [ 20.617351] RSP [ 20.618038] ---[ end trace d28dd60130a57b01 ]--- [ 20.618043] Kernel panic - not syncing: Fatal exception [ 20.623703] Kernel Offset: disabled [ 20.679292] Rebooting in 86400 seconds..