[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.745563] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.689951] random: sshd: uninitialized urandom read (32 bytes read) [ 18.188555] random: sshd: uninitialized urandom read (32 bytes read) [ 19.136021] random: sshd: uninitialized urandom read (32 bytes read) [ 73.565458] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 79.153061] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 79.244416] IPVS: Creating netns size=2536 id=1 executing program executing program [ 79.413614] syz-executor599 (3843) used greatest stack depth: 23160 bytes left executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 87.470829] random: crng init done executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 116.520453] ------------[ cut here ]------------ [ 116.525236] kernel BUG at fs/ext4/inode.c:2630! [ 116.529881] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 116.535222] Dumping ftrace buffer: [ 116.538744] (ftrace buffer empty) [ 116.542444] Modules linked in: [ 116.545759] CPU: 0 PID: 6446 Comm: syz-executor599 Not tainted 4.9.112-g9e79039 #7 [ 116.553470] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 116.562811] task: ffff8801cb368000 task.stack: ffff8801b5a38000 [ 116.568855] RIP: 0010:[] [] mpage_prepare_extent_to_map+0x7f8/0xa40 [ 116.578587] RSP: 0018:ffff8801b5a3f800 EFLAGS: 00010293 [ 116.584010] RAX: ffff8801cb368000 RBX: ffffea0007018200 RCX: 0000000000000000 [ 116.591256] RDX: 0000000000000000 RSI: ffffffff81740088 RDI: ffffea0007018208 [ 116.598512] RBP: ffff8801b5a3f9c8 R08: ffff8801cb368938 R09: 0000000000000001 [ 116.605767] R10: 0000000000000000 R11: 1ffff1003966d122 R12: 0000000000000001 [ 116.613017] R13: 0000000000000000 R14: ffff8801b5a3fb30 R15: dffffc0000000000 [ 116.620266] FS: 0000000000889880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 116.628553] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 116.634410] CR2: 00007fac6e747e78 CR3: 00000001ba86b000 CR4: 00000000001606f0 [ 116.641672] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 116.648919] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 116.656163] Stack: [ 116.658313] 1ffff10036b47f10 ffff8801b5a3fb38 ffff8801b5a3f8a0 ffff8801b5a3fb40 [ 116.666376] 00000000cb3688c0 ffff8801bee08c00 000000090000000c 7fffffffffffffff [ 116.674363] ffff8801b5a3f8e0 ffff8801b5a3fb48 ffffea0007018210 ffffed0036b47f67 [ 116.682348] Call Trace: [ 116.684917] [] ? ext4_journalled_zero_new_buffers+0x3a0/0x3a0 [ 116.692441] [] ? __lock_is_held+0xa2/0xf0 [ 116.698237] [] ? __lock_is_held+0xa2/0xf0 [ 116.704024] [] ext4_writepages+0xdb9/0x2e50 [ 116.709971] [] ? do_writepages+0xef/0x1d0 [ 116.715753] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 116.722315] [] ? debug_check_no_locks_freed+0x210/0x210 [ 116.729308] [] ? __lock_acquire+0x654/0x4070 [ 116.735349] [] ? __lock_acquire+0x654/0x4070 [ 116.741392] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 116.748209] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 116.754763] [] do_writepages+0xef/0x1d0 [ 116.760378] [] ? page_writeback_cpu_online+0x20/0x20 [ 116.767108] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 116.773923] [] __filemap_fdatawrite_range+0x1b3/0x250 [ 116.780760] [] ? replace_page_cache_page+0x620/0x620 [ 116.787504] [] ? ext4_check_all_de+0xf0/0xf0 [ 116.793537] [] filemap_flush+0x23/0x30 [ 116.799048] [] ext4_alloc_da_blocks+0xd9/0x330 [ 116.805259] [] ext4_release_file+0x1ff/0x2e0 [ 116.811302] [] __fput+0x263/0x700 [ 116.816402] [] ____fput+0x15/0x20 [ 116.821482] [] task_work_run+0x10c/0x180 [ 116.827181] [] exit_to_usermode_loop+0xfc/0x120 [ 116.833484] [] do_syscall_64+0x364/0x490 [ 116.839173] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 116.846072] Code: ff 48 8b 75 d0 65 48 33 34 25 28 00 00 00 0f 85 50 02 00 00 48 81 c4 a0 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 e8 e9 c1 ff <0f> 0b e8 e1 e9 c1 ff 8b 95 18 ff ff ff 85 d2 75 7a e8 d2 e9 c1 [ 116.873162] RIP [] mpage_prepare_extent_to_map+0x7f8/0xa40 [ 116.880552] RSP [ 116.885651] ---[ end trace 55d0fb3bf5735192 ]--- [ 116.890407] Kernel panic - not syncing: Fatal exception [ 116.896148] Dumping ftrace buffer: [ 116.899670] (ftrace buffer empty) [ 116.903364] Kernel Offset: disabled [ 116.907346] Rebooting in 86400 seconds..