[....] 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[ 10.393414] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 11.300502] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.59' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.968411] kasan: CONFIG_KASAN_INLINE enabled [ 19.969733] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 19.971346] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 19.973084] Modules linked in: [ 19.973680] CPU: 0 PID: 2041 Comm: syz-executor247 Not tainted 4.9.141+ #23 [ 19.975218] task: ffff8801cfdd4740 task.stack: ffff8801cf210000 [ 19.976578] RIP: 0010:[] [] __blockdev_direct_IO+0x1a99/0xbd10 [ 19.978725] RSP: 0018:ffff8801cf217330 EFLAGS: 00010202 [ 19.979660] RAX: 0000000000000004 RBX: dffffc0000000000 RCX: 0000000000000000 [ 19.981128] RDX: 0000000000000000 RSI: ffffffff815cf6f1 RDI: 0000000000000020 [ 19.982335] RBP: ffff8801cf217650 R08: ffff8801cfdd4ff0 R09: 0000000000000001 [ 19.983942] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 19.985592] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8801cff24000 [ 19.987248] FS: 0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:0000000008bbd840 [ 19.992763] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 19.998638] CR2: 0000000020011000 CR3: 00000001d5230000 CR4: 00000000001606b0 [ 20.005972] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.013223] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.020486] Stack: [ 20.022625] ffff8801cfdd5060 fffffbfff0604a02 ffff8801cf217440 ffff8801cff24098 [ 20.030738] ffff8801cfec0000 0000000000001000 ffffffff83c78930 ffff8801cff24079 [ 20.038811] ffff8801cf217540 092380b9ff49b34a ffff8801cf2174a0 0000000000000fff [ 20.046824] Call Trace: [ 20.049412] [] ? ext4_update_bh_state+0xf0/0xf0 [ 20.055715] [] ? sb_init_dio_done_wq+0x80/0x80 [ 20.061929] [] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 20.069537] [] ? ext4_direct_IO+0x1151/0x29c0 [ 20.075685] [] ? __ext4_journal_stop+0xe6/0x1c0 [ 20.082003] [] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 20.089604] [] ext4_direct_IO+0x978/0x29c0 [ 20.095479] [] ? ext4_da_write_begin+0x1020/0x1020 [ 20.102103] [] ? inode_dio_wait+0x240/0x240 [ 20.108072] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 20.114958] [] ? check_preemption_disabled+0x3b/0x200 [ 20.121782] [] ? filemap_check_errors+0x90/0xc0 [ 20.128101] [] generic_file_direct_write+0x284/0x510 [ 20.134850] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 20.141878] [] __generic_file_write_iter+0x21f/0x540 [ 20.148644] [] ? generic_write_checks+0x245/0x410 [ 20.155125] [] ext4_file_write_iter+0x63d/0xd70 [ 20.161445] [] ? ext4_file_open+0x920/0x920 [ 20.167410] [] ? mark_held_locks+0xc7/0x130 [ 20.173473] [] ? mutex_lock_nested+0x6b7/0x900 [ 20.179788] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.186786] [] ? mutex_lock_nested+0x5dc/0x900 [ 20.193002] [] vfs_iter_write+0x2d7/0x450 [ 20.198797] [] ? vfs_iter_read+0x3f0/0x3f0 [ 20.204661] [] ? splice_from_pipe_next.part.2+0x226/0x2e0 [ 20.211844] [] iter_file_splice_write+0x5fb/0xb30 [ 20.218318] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 20.224458] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 20.231019] [] ? __sb_start_write+0x161/0x300 [ 20.237142] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 20.243267] [] SyS_splice+0xe4d/0x14d0 [ 20.248788] [] ? filp_open+0x70/0x70 [ 20.254132] [] ? compat_SyS_vmsplice+0x160/0x160 [ 20.260527] [] ? do_fast_syscall_32+0xcf/0xa10 [ 20.266988] [] ? compat_SyS_vmsplice+0x160/0x160 [ 20.273645] [] do_fast_syscall_32+0x2f1/0xa10 [ 20.279775] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.286427] [] entry_SYSENTER_compat+0x90/0xa2 [ 20.292644] Code: 89 84 24 98 02 00 00 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 7a 8e 00 00 4f 8b ac e7 a8 00 00 00 49 8d 7d 20 48 89 f8 48 c1 e8 03 <80> 3c 18 00 0f 85 93 8d 00 00 4d 8b 65 20 41 f6 c4 01 0f 85 8c [ 20.319829] RIP [] __blockdev_direct_IO+0x1a99/0xbd10 [ 20.326780] RSP [ 20.330766] ---[ end trace 4ce8cea45a2f4241 ]--- [ 20.335520] Kernel panic - not syncing: Fatal exception [ 20.340901] Kernel Offset: disabled [ 20.344519] Rebooting in 86400 seconds..