[....] 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[ 21.998234] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.932384] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.226799] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.263425] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.23' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 37.076611] page:ffffea0002dc8000 count:2 mapcount:0 mapping: (null) index:0x0 [ 37.108276] flags: 0x4000000000004004(referenced|head) [ 37.120521] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) executing program executing program executing program executing program executing program executing program [ 37.136797] ------------[ cut here ]------------ [ 37.141581] kernel BUG at mm/filemap.c:819! [ 37.145912] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 37.151798] Dumping ftrace buffer: [ 37.155325] (ftrace buffer empty) [ 37.159025] Modules linked in: [ 37.162512] CPU: 0 PID: 5553 Comm: syz-executor962 Not tainted 4.4.129-g23eaecc #27 [ 37.170296] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.179648] task: ffff8800b9018000 task.stack: ffff8800ba078000 executing program executing program executing program executing program [ 37.185927] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 37.194305] RSP: 0018:ffff8800ba07f7d8 EFLAGS: 00010293 [ 37.199747] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc8000 RCX: 0000000000000000 [ 37.207081] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8800b90188dc [ 37.214390] RBP: ffff8800ba07f7f8 R08: 0000000000000001 R09: 0000000000000000 [ 37.221664] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 37.228932] R13: ffff8800ba07faa8 R14: ffffea0002dc9480 R15: ffffea0002dc8008 [ 37.236213] FS: 00007f9ce4745700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 37.244449] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.250330] CR2: 0000000020196000 CR3: 00000000bba4b000 CR4: 00000000001606f0 [ 37.257599] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.264864] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.272130] Stack: [ 37.274265] ffffea0002dc8000 dffffc0000000000 ffff8800ba07faa8 ffffea0002dc9480 [ 37.282358] ffff8800ba07f8e0 ffffffff812cc1bc 0000000000000001 ffff8800ba07f890 [ 37.290408] 0000000000000046 ffff8801d7fede00 00000000b90188d8 ffff8800ba07fab8 [ 37.298507] Call Trace: [ 37.301095] [] get_futex_key+0xadc/0xd80 [ 37.306806] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 37.313307] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 37.320240] [] futex_wait_setup+0xd9/0x330 [ 37.326270] [] ? futex_wake+0x460/0x460 [ 37.331896] [] ? __hrtimer_init+0x143/0x1e0 [ 37.337874] [] futex_wait+0x2af/0x600 [ 37.343341] [] ? futex_wait_setup+0x330/0x330 [ 37.349491] [] ? clock_was_set_work+0x30/0x30 [ 37.355644] [] do_futex+0x2a2/0x1770 [ 37.361018] [] ? exit_robust_list+0x220/0x220 [ 37.367184] [] ? vmacache_update+0xfe/0x130 [ 37.373180] [] ? __do_page_fault+0x385/0xa10 [ 37.379254] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 37.386099] [] ? ktime_add_safe+0xea/0x150 [ 37.391993] [] ? SyS_alarm+0x20/0x20 [ 37.397385] [] ? kvm_clock_read+0x23/0x40 [ 37.403194] [] ? kvm_clock_get_cycles+0x9/0x10 [ 37.409436] [] ? SyS_futex+0x284/0x300 [ 37.415005] [] SyS_futex+0x1f0/0x300 [ 37.420379] [] ? do_futex+0x1770/0x1770 [ 37.426020] [] ? retint_user+0x18/0x3c [ 37.431567] [] ? trace_hardirqs_on_thunk+0x17/0x19 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 37.438156] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 37.444723] Code: e8 48 8d 04 c0 49 8d 3c c6 e8 f8 be df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 8a 32 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 [ 37.472176] RIP [] unlock_page+0x115/0x150 [ 37.478225] RSP executing program [ 37.489666] ---[ end trace b208ec939d0dc1f7 ]--- [ 37.496437] Kernel panic - not syncing: Fatal exception [ 37.502475] Dumping ftrace buffer: [ 37.506008] (ftrace buffer empty) [ 37.509692] Kernel Offset: disabled [ 37.513291] Rebooting in 86400 seconds..