[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 11.419564] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 12.156932] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.847106] kasan: CONFIG_KASAN_INLINE enabled [ 34.848591] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 34.850346] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.852199] Modules linked in: [ 34.853208] CPU: 1 PID: 2042 Comm: syz-executor629 Not tainted 4.9.194+ #0 [ 34.855886] task: 000000009add744d task.stack: 0000000039fec6e7 [ 34.857157] RIP: 0010:[] [<000000003f110c95>] __blockdev_direct_IO+0x1c55/0xd370 [ 34.859764] RSP: 0018:ffff8801cfce7310 EFLAGS: 00010a03 [ 34.861569] RAX: dffffc0000000000 RBX: ffffea00073c761c RCX: 000000000000000c [ 34.864147] RDX: 15471e4f74ae8b08 RSI: ffffffff815dd948 RDI: aa38f27ba5745847 [ 34.865998] RBP: ffff8801cfce7650 R08: 0000000000000000 R09: ffff8801d15c4800 [ 34.871548] R10: ffffed003a2b890d R11: ffff8801d15c486f R12: ffffea00073c7600 [ 34.879347] R13: ffffea00073c7600 R14: 0000000000000000 R15: ffff8801d24bc000 [ 34.886614] FS: 0000000001b3a880(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 34.894821] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.900695] CR2: 0000000020011000 CR3: 00000001cfcfd000 CR4: 00000000001606b0 [ 34.907973] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.915228] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.922492] Stack: [ 34.924636] ffffffff83cc9110 0000000000000003 1ffff1003a2e9805 ffff8801d174c028 [ 34.932683] ffff8801d174af80 ffff8801cfce7440 8e41a6e95d160000 0000000000001000 [ 34.940736] ffff8801d24bc079 ffff8801d174af80 ffff8801d9190b80 ffff880100000000 [ 34.948772] Call Trace: [ 34.951350] [<00000000b8957d65>] ? sb_init_dio_done_wq+0x80/0x80 [ 34.957639] [<0000000078c2eb8f>] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 34.965267] [<000000006fceb861>] ? ext4_direct_IO+0xc17/0x29b0 [ 34.971312] [<000000001d1d3d9f>] ? ext4_direct_IO+0xc69/0x29b0 [ 34.977353] [<00000000cd0d469e>] ? __ext4_journal_stop+0xea/0x1c0 [ 34.983653] [<0000000076edb399>] ext4_direct_IO+0xa1d/0x29b0 [ 34.989521] [<0000000078c2eb8f>] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 34.997119] [<00000000f5b9b8d4>] ? ext4_da_write_begin+0x1080/0x1080 [ 35.003681] [<000000008d789acd>] ? trace_hardirqs_on+0x10/0x10 [ 35.009718] [<00000000a8281605>] ? ext4_xattr_security_set+0x40/0x40 [ 35.016388] [<000000000c6386ff>] ? ext4_xattr_security_get+0x32/0x40 [ 35.022946] [<00000000c26693eb>] ? __vfs_getxattr+0xea/0x140 [ 35.028808] [<00000000b2bdf98a>] ? __vfs_setxattr+0x170/0x170 [ 35.034757] [<000000009da6beeb>] ? __lock_acquire+0x26fe/0x4390 [ 35.040881] [<000000005f632a2c>] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 35.047620] [<0000000076e1471b>] ? mark_held_locks+0xb1/0x100 [ 35.053571] [<000000007b3b6050>] ? filemap_check_errors+0x90/0xc0 [ 35.059968] [<000000001c35a17b>] generic_file_direct_write+0x293/0x520 [ 35.066721] [<00000000bec30a1f>] ? current_kernel_time64+0xbc/0x110 [ 35.074796] [<000000007ed6005b>] ? filemap_write_and_wait_range+0xb0/0xb0 [ 35.083364] [<00000000b03becd2>] ? file_update_time+0xc1/0x390 [ 35.089412] [<000000008caa8199>] __generic_file_write_iter+0x20f/0x530 [ 35.096196] [<0000000009510c35>] ? generic_write_checks+0x245/0x410 [ 35.102831] [<00000000a128acd4>] ext4_file_write_iter+0x6e7/0xcd0 [ 35.109140] [<00000000cd4ddc75>] ? ext4_llseek+0x8e0/0x8e0 [ 35.114838] [<0000000076e1471b>] ? mark_held_locks+0xb1/0x100 [ 35.120793] [<000000005ad4885e>] ? mutex_lock_nested+0x6c7/0x920 [ 35.127017] [<00000000880d63e4>] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 35.134431] [<00000000ab76c811>] vfs_iter_write+0x2e2/0x580 [ 35.140409] [<00000000b83d97c0>] ? do_iter_readv_writev+0x4b0/0x4b0 [ 35.147249] [<00000000ce94041b>] ? mutex_trylock+0x3f0/0x3f0 [ 35.153224] [<00000000754dddeb>] ? kasan_unpoison_shadow+0x35/0x50 [ 35.159646] [<0000000089bb386a>] ? splice_from_pipe_next.part.0+0x1e9/0x290 [ 35.166895] [<00000000e7225ae7>] iter_file_splice_write+0x5a9/0xb10 [ 35.173404] [<000000006c0c072b>] ? vmsplice_to_user+0x1e0/0x1e0 [ 35.179559] [<00000000ad1412c6>] ? rcu_read_lock_sched_held+0x10b/0x130 [ 35.186470] [<00000000e4bd719e>] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 35.193167] [<0000000029c1d2f7>] ? __sb_start_write+0x161/0x310 [ 35.199415] [<000000006c0c072b>] ? vmsplice_to_user+0x1e0/0x1e0 [ 35.205562] [<000000001d9b68da>] SyS_splice+0xe02/0x14c0 [ 35.211084] [<00000000f53575c2>] ? compat_SyS_vmsplice+0x160/0x160 [ 35.217480] [<00000000a9be0110>] ? do_syscall_64+0x4a/0x5c0 [ 35.223281] [<00000000f53575c2>] ? compat_SyS_vmsplice+0x160/0x160 [ 35.229795] [<00000000087d902e>] do_syscall_64+0x1ad/0x5c0 [ 35.235496] [<00000000c7ad9419>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 35.242410] 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 [ 35.270716] RIP [<000000003f110c95>] __blockdev_direct_IO+0x1c55/0xd370 [ 35.277795] RSP [ 35.283279] ---[ end trace a01edf97e5da898c ]--- [ 35.288187] Kernel panic - not syncing: Fatal exception [ 35.294208] Kernel Offset: disabled [ 35.298899] Rebooting in 86400 seconds..