[....] 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[ 21.402800] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.297887] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 23.559548] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.624524] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.31' (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 [ 30.388044] page:ffffea00071b0000 count:2 mapcount:0 mapping: (null) index:0x0 [ 30.400031] flags: 0x8000000000004004(referenced|head) [ 30.405722] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 30.412474] ------------[ cut here ]------------ [ 30.417211] kernel BUG at mm/filemap.c:819! [ 30.421507] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 30.427324] Dumping ftrace buffer: [ 30.430839] (ftrace buffer empty) [ 30.434520] Modules linked in: [ 30.437807] CPU: 1 PID: 3839 Comm: syz-executor660 Not tainted 4.4.131-g6ec0e3f #34 [ 30.445571] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.454902] task: ffff8800bbade000 task.stack: ffff8800bb0d0000 [ 30.460932] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 30.470043] RSP: 0018:ffff8800bb0d7760 EFLAGS: 00010293 [ 30.475467] RAX: ffffffff83a6e7c0 RBX: ffffea00071b0000 RCX: 0000000000000000 [ 30.482714] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8800bbade8dc [ 30.489957] RBP: ffff8800bb0d7780 R08: 0000000000000001 R09: 0000000000000000 [ 30.497201] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 30.504446] R13: ffff8800bb0d7a30 R14: ffffea00071b1480 R15: ffffea00071b0008 [ 30.511694] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77bdb40 [ 30.519894] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 30.525747] CR2: 00000000204a4ff0 CR3: 00000000b100f000 CR4: 00000000001606f0 [ 30.532992] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.540236] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.547476] Stack: [ 30.549597] ffffea00071b0000 dffffc0000000000 ffff8800bb0d7a30 ffffea00071b1480 [ 30.557581] ffff8800bb0d7868 ffffffff812cc1bc 0000000000000001 ffff8800bb0d7818 [ 30.565571] 0000000000000046 ffff8800ad447700 00000000bbade8d8 ffff8800bb0d7a40 [ 30.573555] Call Trace: [ 30.576123] [] get_futex_key+0xadc/0xd80 [ 30.581814] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 30.588279] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 30.595181] [] futex_wait_setup+0xd9/0x330 [ 30.601038] [] ? futex_wake+0x460/0x460 [ 30.606636] [] ? __hrtimer_init+0x143/0x1e0 [ 30.612583] [] futex_wait+0x2af/0x600 [ 30.618011] [] ? futex_wait_setup+0x330/0x330 [ 30.624132] [] ? native_set_pte_at+0xe0/0xe0 [ 30.630172] [] ? do_huge_pmd_anonymous_page+0x52d/0x9d0 [ 30.637167] [] ? clock_was_set_work+0x30/0x30 [ 30.643288] [] do_futex+0x2a2/0x1770 [ 30.648627] [] ? exit_robust_list+0x220/0x220 [ 30.654749] [] ? retint_kernel+0x2d/0x2d [ 30.660437] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 30.667249] [] ? ktime_add_safe+0xea/0x150 [ 30.673114] [] ? SyS_alarm+0x20/0x20 [ 30.678451] [] ? kvm_clock_read+0x23/0x40 [ 30.684221] [] ? kvm_clock_get_cycles+0x9/0x10 [ 30.690427] [] ? compat_SyS_futex+0x26d/0x2f0 [ 30.696544] [] compat_SyS_futex+0x1d9/0x2f0 [ 30.702490] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 30.709563] [] ? __bad_area_nosemaphore+0x21e/0x310 [ 30.716203] [] ? do_fast_syscall_32+0xdb/0x8b0 [ 30.722410] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 30.729393] [] do_fast_syscall_32+0x326/0x8b0 [ 30.735513] [] sysenter_flags_fixed+0xd/0x17 [ 30.741542] 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 [ 30.768358] RIP [] unlock_page+0x115/0x150 [ 30.774345] RSP [ 30.778208] ---[ end trace 2f91d71cd12b4a4a ]--- [ 30.783682] Kernel panic - not syncing: Fatal exception [ 30.789452] Dumping ftrace buffer: [ 30.792966] (ftrace buffer empty) [ 30.796646] Kernel Offset: disabled [ 30.800249] Rebooting in 86400 seconds..