Starting mcstransd: [ 10.008624] random: sshd: uninitialized urandom read (32 bytes read) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 41.475806] random: sshd: uninitialized urandom read (32 bytes read) [ 41.875401] random: sshd: uninitialized urandom read (32 bytes read) [ 42.110279] random: crng init done Warning: Permanently added '10.128.0.215' (ECDSA) to the list of known hosts. executing program [ 61.617907] kasan: CONFIG_KASAN_INLINE enabled [ 61.622808] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 61.630782] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 61.637096] Modules linked in: [ 61.640426] CPU: 0 PID: 2063 Comm: syz-executor321 Not tainted 4.9.194+ #0 [ 61.647418] task: 0000000076ef2c65 task.stack: 0000000084205bd5 [ 61.653983] RIP: 0010:[] [<000000003c1f90fb>] __blockdev_direct_IO+0x1c55/0xd370 [ 61.664681] RSP: 0018:ffff8801cee87310 EFLAGS: 00010202 [ 61.670402] RAX: dffffc0000000000 RBX: ffffea00073ad41c RCX: 000000000000000c [ 61.677668] RDX: 0000000000000004 RSI: ffffffff815dd948 RDI: 0000000000000020 [ 61.685036] RBP: ffff8801cee87650 R08: 0000000000000000 R09: ffff8801d4c7d800 [ 61.692477] R10: ffffed003a98fb0d R11: ffff8801d4c7d86f R12: ffffea00073ad400 [ 61.699736] R13: ffffea00073ad400 R14: 0000000000000000 R15: ffff8801ced6c000 [ 61.707024] FS: 0000000000966880(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000 [ 61.715248] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.721313] CR2: 0000000020011000 CR3: 00000001cee4b000 CR4: 00000000001606b0 [ 61.728574] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.736195] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.743457] Stack: [ 61.745590] ffffffff83cc9110 0000000000000003 1ffff1003a062df5 ffff8801d0316fa8 [ 61.753596] ffff8801d0315f00 ffff8801cee87440 0005080000000000 0000000000001000 [ 61.761719] ffff8801ced6c079 ffff8801d0315f00 ffff8801d915e780 ffffffff00000000 [ 61.769900] Call Trace: [ 61.772483] [<00000000643a4ae4>] ? sb_init_dio_done_wq+0x80/0x80 [ 61.778908] [<000000007e88c1f4>] ? check_preemption_disabled+0x3c/0x200 [ 61.785865] [<000000007e88c1f4>] ? check_preemption_disabled+0x3c/0x200 [ 61.792708] [<000000008a1a81ec>] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 61.800315] [<0000000038fb8988>] ? ext4_direct_IO+0xc17/0x29b0 [ 61.806355] [<00000000b9cf4d14>] ? ext4_direct_IO+0xc69/0x29b0 [ 61.812592] [<00000000e15d68f8>] ? __ext4_journal_stop+0xea/0x1c0 [ 61.818909] [<000000005e8c6f68>] ext4_direct_IO+0xa1d/0x29b0 [ 61.824805] [<000000008a1a81ec>] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 61.832417] [<00000000c81b3a9a>] ? ext4_da_write_begin+0x1080/0x1080 [ 61.838997] [<00000000511722d3>] ? ext4_mark_inode_dirty+0x3e3/0xb30 [ 61.845679] [<0000000020f208c9>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 61.853390] [<000000007e88c1f4>] ? check_preemption_disabled+0x3c/0x200 [ 61.860228] [<000000007e88c1f4>] ? check_preemption_disabled+0x3c/0x200 [ 61.867456] [<000000004606664f>] ? filemap_check_errors+0x90/0xc0 [ 61.873779] [<00000000a1e92c9a>] generic_file_direct_write+0x293/0x520 [ 61.880550] [<00000000d7171782>] ? filemap_write_and_wait_range+0xb0/0xb0 [ 61.887793] [<0000000049c956d4>] ? file_update_time+0xc1/0x390 [ 61.893865] [<00000000b0b61892>] __generic_file_write_iter+0x20f/0x530 [ 61.900629] [<00000000a0a9db18>] ? generic_write_checks+0x245/0x410 [ 61.907116] [<000000001b807af6>] ext4_file_write_iter+0x6e7/0xcd0 [ 61.913422] [<00000000710f52bb>] ? ext4_llseek+0x8e0/0x8e0 [ 61.919131] [<000000001d9cae5f>] ? mark_held_locks+0xb1/0x100 [ 61.925426] [<000000003f1c29f8>] ? mutex_lock_nested+0x6c7/0x920 [ 61.932510] [<00000000dfd7a120>] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 61.939331] [<0000000048a87cfa>] vfs_iter_write+0x2e2/0x580 [ 61.945122] [<00000000dca07436>] ? do_iter_readv_writev+0x4b0/0x4b0 [ 61.951606] [<00000000292c802b>] ? mutex_trylock+0x3f0/0x3f0 [ 61.957965] [<0000000080608fce>] ? kasan_unpoison_shadow+0x35/0x50 [ 61.964631] [<00000000d5603d40>] ? splice_from_pipe_next.part.0+0x1e9/0x290 [ 61.972073] [<00000000cd04badd>] iter_file_splice_write+0x5a9/0xb10 [ 61.978652] [<000000006e05d9c2>] ? vmsplice_to_user+0x1e0/0x1e0 [ 61.984780] [<00000000d089169d>] ? rcu_read_lock_sched_held+0x10b/0x130 [ 61.991866] [<0000000002b7038e>] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 61.998429] [<00000000070f22df>] ? __sb_start_write+0x161/0x310 [ 62.004557] [<000000006e05d9c2>] ? vmsplice_to_user+0x1e0/0x1e0 [ 62.010693] [<00000000b7aca186>] SyS_splice+0xe02/0x14c0 [ 62.016212] [<00000000cb4756d8>] ? compat_SyS_vmsplice+0x160/0x160 [ 62.022602] [<00000000429d3319>] ? do_syscall_64+0x4a/0x5c0 [ 62.028477] [<00000000cb4756d8>] ? compat_SyS_vmsplice+0x160/0x160 [ 62.035209] [<00000000e743883e>] do_syscall_64+0x1ad/0x5c0 [ 62.040944] [<000000009cffe7a1>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 62.048022] 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 [ 62.076532] RIP [<000000003c1f90fb>] __blockdev_direct_IO+0x1c55/0xd370 [ 62.084092] RSP [ 62.088214] ---[ end trace 138211d6c6e1546a ]--- [ 62.092997] Kernel panic - not syncing: Fatal exception [ 62.099641] Kernel Offset: disabled [ 62.103278] Rebooting in 86400 seconds..