[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [ 10.378347] random: sshd: uninitialized urandom read (32 bytes read) [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.276571] random: crng init done Warning: Permanently added '10.128.1.3' (ECDSA) to the list of known hosts. executing program [ 22.307110] kasan: CONFIG_KASAN_INLINE enabled [ 22.311823] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 22.319284] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 22.325505] Modules linked in: [ 22.328802] CPU: 1 PID: 2044 Comm: syz-executor026 Not tainted 4.9.191+ #0 [ 22.335920] task: 00000000816cef1b task.stack: 00000000e0268ce5 [ 22.341959] RIP: 0010:[] [<00000000263da7db>] __blockdev_direct_IO+0x1c55/0xd370 [ 22.351276] RSP: 0018:ffff8801c42cf310 EFLAGS: 00010202 [ 22.356808] RAX: dffffc0000000000 RBX: ffffea00073a561c RCX: 000000000000000c [ 22.364178] RDX: 0000000000000004 RSI: ffffffff815ddad8 RDI: 0000000000000020 [ 22.371442] RBP: ffff8801c42cf650 R08: 0000000000000000 R09: ffff8801d1b08800 [ 22.378696] R10: ffffed003a36110d R11: ffff8801d1b0886f R12: ffffea00073a5600 [ 22.386116] R13: ffffea00073a5600 R14: 0000000000000000 R15: ffff8801ce90c000 [ 22.393624] FS: 0000000002617880(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 22.402093] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.408054] CR2: 0000000020011000 CR3: 00000001ce876000 CR4: 00000000001606b0 [ 22.415313] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.422575] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.429865] Stack: [ 22.432522] ffffffff83cc9470 0000000000000003 1ffff1003a0e3805 ffff8801d071c028 [ 22.440556] ffff8801d071af80 ffff8801c42cf440 0005080000000000 0000000000001000 [ 22.448654] ffff8801ce90c079 ffff8801d071af80 ffff8801d915e780 ffffffff00000000 [ 22.457470] Call Trace: [ 22.460060] [<00000000b8e67ba3>] ? sb_init_dio_done_wq+0x80/0x80 [ 22.466271] [<0000000016cba0e0>] ? check_preemption_disabled+0x3c/0x200 [ 22.473088] [<0000000016cba0e0>] ? check_preemption_disabled+0x3c/0x200 [ 22.479911] [<0000000066508ecb>] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 22.487686] [<00000000889a3f40>] ? ext4_direct_IO+0xc17/0x29b0 [ 22.493724] [<00000000bbdea83e>] ? ext4_direct_IO+0xc69/0x29b0 [ 22.499775] [<00000000eb8479ac>] ? __ext4_journal_stop+0xea/0x1c0 [ 22.506088] [<00000000c2c9b563>] ext4_direct_IO+0xa1d/0x29b0 [ 22.511970] [<0000000066508ecb>] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 22.519584] [<000000004e349d90>] ? ext4_da_write_begin+0x1080/0x1080 [ 22.526149] [<0000000011c04c75>] ? ext4_mark_inode_dirty+0x3e3/0xb30 [ 22.533334] [<000000000307657e>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 22.540077] [<0000000016cba0e0>] ? check_preemption_disabled+0x3c/0x200 [ 22.546894] [<0000000016cba0e0>] ? check_preemption_disabled+0x3c/0x200 [ 22.553721] [<00000000c466acaf>] ? filemap_check_errors+0x90/0xc0 [ 22.560017] [<00000000ca9a2289>] generic_file_direct_write+0x293/0x520 [ 22.566746] [<000000002b00c67d>] ? filemap_write_and_wait_range+0xb0/0xb0 [ 22.573737] [<000000004a94afcc>] ? file_update_time+0xc1/0x390 [ 22.579784] [<00000000bd9b5b3a>] __generic_file_write_iter+0x20f/0x530 [ 22.586516] [<000000000f6d0a0e>] ? generic_write_checks+0x245/0x410 [ 22.592984] [<000000000a784361>] ext4_file_write_iter+0x6e7/0xcd0 [ 22.599281] [<0000000097d4c1f1>] ? ext4_llseek+0x8e0/0x8e0 [ 22.604967] [<000000000dcc271f>] ? mark_held_locks+0xb1/0x100 [ 22.610915] [<000000005291713a>] ? mutex_lock_nested+0x6c7/0x920 [ 22.619129] [<00000000dec5735e>] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 22.625948] [<000000001a8a6044>] vfs_iter_write+0x2e2/0x580 [ 22.631726] [<0000000079bb67df>] ? do_iter_readv_writev+0x4b0/0x4b0 [ 22.638196] [<00000000cdf64b55>] ? mutex_trylock+0x3f0/0x3f0 [ 22.644071] [<00000000a26796f4>] ? kasan_unpoison_shadow+0x35/0x50 [ 22.650458] [<000000009d27d21e>] ? splice_from_pipe_next.part.0+0x1e9/0x290 [ 22.657729] [<0000000068c9fd69>] iter_file_splice_write+0x5a9/0xb10 [ 22.665808] [<00000000a156fd11>] ? vmsplice_to_user+0x1e0/0x1e0 [ 22.672136] [<0000000063276d94>] ? rcu_read_lock_sched_held+0x10b/0x130 [ 22.679151] [<000000008795bea1>] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 22.685737] [<0000000070b90e0a>] ? __sb_start_write+0x161/0x310 [ 22.693207] [<00000000a156fd11>] ? vmsplice_to_user+0x1e0/0x1e0 [ 22.701973] [<000000003a62c447>] SyS_splice+0xe02/0x14c0 [ 22.708221] [<000000007d3b493a>] ? compat_SyS_vmsplice+0x160/0x160 [ 22.716380] [<00000000332fa51b>] ? do_syscall_64+0x4a/0x5c0 [ 22.722661] [<000000007d3b493a>] ? compat_SyS_vmsplice+0x160/0x160 [ 22.729255] [<00000000edbe4289>] do_syscall_64+0x1ad/0x5c0 [ 22.735155] [<000000009ec19c75>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.743129] Code: b2 81 e6 ff e9 b3 77 00 00 e8 b8 4d d4 ff 48 8b 84 24 f8 00 00 00 48 8d 78 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 bc 96 00 00 48 8b 84 24 f8 00 00 00 4c 8b 68 [ 22.770565] RIP [<00000000263da7db>] __blockdev_direct_IO+0x1c55/0xd370 [ 22.777600] RSP [ 22.781660] ---[ end trace f5d02020fcaccc37 ]--- [ 22.786537] Kernel panic - not syncing: Fatal exception [ 22.792552] Kernel Offset: disabled [ 22.796175] Rebooting in 86400 seconds..