[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.821556] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.462313] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.773002] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.820735] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.363971] page:ffffea0002dc8000 count:2 mapcount:0 mapping: (null) index:0x0 [ 34.372793] flags: 0x4000000000004004(referenced|head) [ 34.378447] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 34.384874] ------------[ cut here ]------------ [ 34.389626] kernel BUG at mm/filemap.c:819! [ 34.393921] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 34.399751] Dumping ftrace buffer: [ 34.403267] (ftrace buffer empty) [ 34.407128] Modules linked in: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.410429] CPU: 1 PID: 3708 Comm: syz-executor512 Not tainted 4.4.131-g3702e76 #38 [ 34.418197] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.427529] task: ffff8801cdba3000 task.stack: ffff8801ce0c8000 [ 34.433561] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 34.441896] RSP: 0018:ffff8801ce0cf7d8 EFLAGS: 00010293 [ 34.447323] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc8000 RCX: 0000000000000000 [ 34.454582] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8801cdba38dc executing program executing program executing program executing program executing program executing program executing program executing program [ 34.461834] RBP: ffff8801ce0cf7f8 R08: 0000000000000001 R09: 0000000000000000 [ 34.469090] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 34.476343] R13: ffff8801ce0cfaa8 R14: ffffea0002dc9480 R15: ffffea0002dc8008 [ 34.483590] FS: 00007f9744b05700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.491791] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.497649] CR2: 00000000204a4ff0 CR3: 00000001cde19000 CR4: 00000000001606f0 [ 34.504900] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.512148] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.519391] Stack: [ 34.521513] ffffea0002dc8000 dffffc0000000000 ffff8801ce0cfaa8 ffffea0002dc9480 [ 34.529522] ffff8801ce0cf8e0 ffffffff812cc1bc 0000000000000001 ffff8801ce0cf890 [ 34.537517] 0000000000000046 ffff8800b19d6300 00000000cdba38d8 ffff8801ce0cfab8 [ 34.545496] Call Trace: [ 34.548062] [] get_futex_key+0xadc/0xd80 [ 34.553761] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 executing program executing program executing program executing program executing program executing program executing program [ 34.560236] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 34.567143] [] futex_wait_setup+0xd9/0x330 [ 34.573007] [] ? futex_wake+0x460/0x460 [ 34.578617] [] ? __hrtimer_init+0x143/0x1e0 [ 34.584589] [] futex_wait+0x2af/0x600 [ 34.590019] [] ? futex_wait_setup+0x330/0x330 [ 34.596140] [] ? clock_was_set_work+0x30/0x30 [ 34.602262] [] do_futex+0x2a2/0x1770 [ 34.607606] [] ? exit_robust_list+0x220/0x220 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.613732] [] ? __do_page_fault+0x385/0xa10 [ 34.619775] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.626609] [] ? ktime_add_safe+0xea/0x150 [ 34.632472] [] ? SyS_alarm+0x20/0x20 [ 34.637817] [] ? kvm_clock_read+0x23/0x40 [ 34.643591] [] ? kvm_clock_get_cycles+0x9/0x10 [ 34.649798] [] ? SyS_futex+0x284/0x300 [ 34.655327] [] SyS_futex+0x1f0/0x300 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.660684] [] ? do_futex+0x1770/0x1770 [ 34.666284] [] ? retint_user+0x18/0x3c [ 34.671803] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 34.678364] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.684914] Code: e8 48 8d 04 c0 49 8d 3c c6 e8 48 c0 df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 da 33 f3 ff 48 c7 c6 60 aa a9 83 48 89 df e8 4b eb 06 00 <0f> 0b 48 89 df e8 f1 b1 0d 00 e9 0a ff ff ff e8 e7 b1 0d 00 e9 executing program executing program [ 34.711778] RIP [] unlock_page+0x115/0x150 [ 34.717764] RSP [ 34.721645] ---[ end trace 1e333039d710acc6 ]--- [ 34.726395] Kernel panic - not syncing: Fatal exception [ 34.732210] Dumping ftrace buffer: [ 34.735724] (ftrace buffer empty) [ 34.739407] Kernel Offset: disabled [ 34.743006] Rebooting in 86400 seconds..