[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.233634] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.337526] random: sshd: uninitialized urandom read (32 bytes read) [ 13.566036] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.770013] random: sshd: uninitialized urandom read (32 bytes read) [ 15.197433] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.51' (ECDSA) to the list of known hosts. [ 20.771763] random: sshd: uninitialized urandom read (32 bytes read) net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 20.858851] IPVS: Creating netns size=2536 id=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 21.917363] syz-executor468 (3888) used greatest stack depth: 23608 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 [ 25.554315] syz-executor468 (4191) used greatest stack depth: 23096 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 [ 31.841865] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 71.417955] ------------[ cut here ]------------ [ 71.422777] kernel BUG at fs/ext4/inode.c:2630! [ 71.427619] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 71.432963] Dumping ftrace buffer: [ 71.436767] (ftrace buffer empty) [ 71.440462] Modules linked in: [ 71.443782] CPU: 1 PID: 7830 Comm: syz-executor468 Not tainted 4.9.112-g9e79039 #59 [ 71.451710] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 71.461080] task: ffff8801bd78b000 task.stack: ffff8801bb1f0000 [ 71.467229] RIP: 0010:[] [] mpage_prepare_extent_to_map+0x7f8/0xa40 [ 71.477013] RSP: 0018:ffff8801bb1f7800 EFLAGS: 00010293 [ 71.482529] RAX: ffff8801bd78b000 RBX: ffffea0006e9f4c0 RCX: 0000000000000000 [ 71.489786] RDX: 0000000000000000 RSI: ffffffff81740088 RDI: ffffea0006e9f4c8 [ 71.497034] RBP: ffff8801bb1f79c8 R08: ffff8801bd78b938 R09: 0000000000000001 [ 71.504293] R10: 0000000000000000 R11: 1ffff10037af1722 R12: 0000000000000004 [ 71.511547] R13: 0000000000000000 R14: ffff8801bb1f7b30 R15: dffffc0000000000 [ 71.518814] FS: 0000000000b76880(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 71.527028] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 71.532897] CR2: 00007fb35d96fe78 CR3: 00000001cca76000 CR4: 00000000001606f0 [ 71.540183] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 71.547444] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 71.554697] Stack: [ 71.556831] 1ffff1003763ef10 ffff8801bb1f7b38 ffff8801bb1f78a0 ffff8801bb1f7b40 [ 71.564857] 00000000bd78b8c0 ffff8801b3589c30 000000060000000c 7fffffffffffffff [ 71.572876] ffff8801bb1f78e0 ffff8801bb1f7b48 ffffea0006e9f4d0 ffffed003763ef67 [ 71.580935] Call Trace: [ 71.583564] [] ? ext4_journalled_zero_new_buffers+0x3a0/0x3a0 [ 71.591097] [] ? __lock_is_held+0xa2/0xf0 [ 71.596905] [] ? __lock_is_held+0xa2/0xf0 [ 71.602710] [] ext4_writepages+0xdb9/0x2e50 [ 71.608685] [] ? do_writepages+0xef/0x1d0 [ 71.614473] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 71.621029] [] ? debug_check_no_locks_freed+0x210/0x210 [ 71.628017] [] ? __lock_acquire+0x654/0x4070 [ 71.634046] [] ? __lock_acquire+0x654/0x4070 [ 71.640101] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 71.646918] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 71.653469] [] do_writepages+0xef/0x1d0 [ 71.659068] [] ? page_writeback_cpu_online+0x20/0x20 [ 71.665795] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 71.672625] [] __filemap_fdatawrite_range+0x1b3/0x250 [ 71.679469] [] ? replace_page_cache_page+0x620/0x620 [ 71.686373] [] ? ext4_check_all_de+0xf0/0xf0 [ 71.692418] [] filemap_flush+0x23/0x30 [ 71.697932] [] ext4_alloc_da_blocks+0xd9/0x330 [ 71.704157] [] ext4_release_file+0x1ff/0x2e0 [ 71.710200] [] __fput+0x263/0x700 [ 71.715279] [] ____fput+0x15/0x20 [ 71.720362] [] task_work_run+0x10c/0x180 [ 71.726059] [] exit_to_usermode_loop+0xfc/0x120 [ 71.732357] [] do_syscall_64+0x364/0x490 [ 71.738051] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 71.744964] 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 [ 71.771938] RIP [] mpage_prepare_extent_to_map+0x7f8/0xa40 [ 71.779336] RSP [ 71.783094] ---[ end trace 985986522551122b ]--- [ 71.787831] Kernel panic - not syncing: Fatal exception [ 71.793615] Dumping ftrace buffer: [ 71.797159] (ftrace buffer empty) [ 71.800961] Kernel Offset: disabled [ 71.804581] Rebooting in 86400 seconds..