Starting mcstransd: [ 10.141176] 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: [ 12.063181] random: sshd: uninitialized urandom read (32 bytes read) [ 12.332836] random: sshd: uninitialized urandom read (32 bytes read) [ 12.467553] random: crng init done Warning: Permanently added '10.128.0.109' (ECDSA) to the list of known hosts. executing program [ 18.782377] kasan: CONFIG_KASAN_INLINE enabled [ 18.783909] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 18.785844] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 18.787856] Modules linked in: [ 18.788497] CPU: 1 PID: 2043 Comm: syz-executor298 Not tainted 4.9.141+ #1 [ 18.789888] task: ffff8801cfc8c740 task.stack: ffff8801ced40000 [ 18.791546] RIP: 0010:[] [] __blockdev_direct_IO+0x1a99/0xbd10 [ 18.793907] RSP: 0018:ffff8801ced47340 EFLAGS: 00010202 [ 18.795100] RAX: 0c8c2cae4d0a814a RBX: dffffc0000000000 RCX: 0000000000000000 [ 18.796748] RDX: 0000000000000000 RSI: ffffffff815cf6f1 RDI: 6461657268540a50 [ 18.799627] RBP: ffff8801ced47660 R08: ffff8801cfc8cff0 R09: 0000000000000001 [ 18.801023] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 18.802406] R13: 6461657268540a30 R14: 0000000000000000 R15: ffff8801ced20000 [ 18.810823] FS: 000000000138a880(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 18.819679] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 18.825837] CR2: 0000000020011000 CR3: 00000001c40c8000 CR4: 00000000001606b0 [ 18.833452] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 18.841372] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 18.848719] Stack: [ 18.850955] 0000000000000246 fffffbfff0604a02 ffff8801ced47450 ffff8801ced20098 [ 18.859684] ffff8801ced50000 0000000000001000 ffffffff83c78930 ffff8801ced20079 [ 18.868422] ffff8801ced47550 7c18db5957270d7a ffff8801ced474b0 0000000000000fff [ 18.877373] Call Trace: [ 18.880033] [] ? ext4_update_bh_state+0xf0/0xf0 [ 18.886728] [] ? sb_init_dio_done_wq+0x80/0x80 [ 18.893130] [] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 18.901989] [] ? ext4_direct_IO+0x1151/0x29c0 [ 18.908330] [] ? __ext4_journal_stop+0xe6/0x1c0 [ 18.915203] [] ? ext4_dio_get_block_unwritten_sync+0x100/0x100 [ 18.923034] [] ext4_direct_IO+0x978/0x29c0 [ 18.929104] [] ? ext4_da_write_begin+0x1020/0x1020 [ 18.935937] [] ? ext4_xattr_security_get+0x32/0x40 [ 18.943113] [] ? ext4_xattr_security_set+0x40/0x40 [ 18.949861] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 18.956795] [] ? mark_held_locks+0xc7/0x130 [ 18.962978] [] ? current_kernel_time64+0xc9/0x120 [ 18.969729] [] ? timespec_trunc+0xc1/0x160 [ 18.976220] [] ? filemap_check_errors+0x90/0xc0 [ 18.982649] [] generic_file_direct_write+0x284/0x510 [ 18.989651] [] ? filemap_write_and_wait_range+0xb0/0xb0 [ 18.996910] [] __generic_file_write_iter+0x21f/0x540 [ 19.003754] [] ? generic_write_checks+0x245/0x410 [ 19.010235] [] ext4_file_write_iter+0x63d/0xd70 [ 19.016888] [] ? ext4_file_open+0x920/0x920 [ 19.022929] [] ? mark_held_locks+0xc7/0x130 [ 19.028903] [] ? mutex_lock_nested+0x6b7/0x900 [ 19.035214] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 19.042555] [] ? mutex_lock_nested+0x5dc/0x900 [ 19.049310] [] vfs_iter_write+0x2d7/0x450 [ 19.055109] [] ? vfs_iter_read+0x3f0/0x3f0 [ 19.061689] [] ? splice_from_pipe_next.part.2+0x226/0x2e0 [ 19.069039] [] iter_file_splice_write+0x5fb/0xb30 [ 19.075522] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 19.082119] [] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 19.088900] [] ? __sb_start_write+0x161/0x300 [ 19.096007] [] ? vmsplice_to_user+0x1e0/0x1e0 [ 19.102239] [] SyS_splice+0xe4d/0x14d0 [ 19.107863] [] ? filp_open+0x70/0x70 [ 19.113658] [] ? compat_SyS_vmsplice+0x160/0x160 [ 19.120840] [] ? do_syscall_64+0x48/0x550 [ 19.127158] [] ? compat_SyS_vmsplice+0x160/0x160 [ 19.133810] [] do_syscall_64+0x19f/0x550 [ 19.140990] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 19.148344] 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 [ 19.177738] RIP [] __blockdev_direct_IO+0x1a99/0xbd10 [ 19.184888] RSP [ 19.189591] ---[ end trace 5d5360835db57bdc ]--- [ 19.195072] Kernel panic - not syncing: Fatal exception [ 19.201523] Kernel Offset: disabled [ 19.205311] Rebooting in 86400 seconds..