[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.535156] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.639814] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.031633] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.141785] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) [ 28.335489] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 32.453574] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.11' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 41.377672] page:ffffea0007190000 count:2 mapcount:0 mapping: (null) index:0x0 [ 41.388308] flags: 0x8000000000004004(referenced|head) [ 41.397949] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 41.416700] ------------[ cut here ]------------ [ 41.421499] kernel BUG at mm/filemap.c:819! [ 41.425827] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 41.431741] Dumping ftrace buffer: [ 41.435283] (ftrace buffer empty) [ 41.438984] Modules linked in: [ 41.442299] CPU: 0 PID: 6677 Comm: syz-executor609 Not tainted 4.4.131-gfcce571 #36 [ 41.450085] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.459442] task: ffff8801d4053000 task.stack: ffff8801d44b8000 [ 41.465522] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 41.473945] RSP: 0018:ffff8801d44bf7d8 EFLAGS: 00010293 [ 41.479657] RAX: ffffffff83a6e7c0 RBX: ffffea0007190000 RCX: 0000000000000000 [ 41.486930] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8801d40538dc [ 41.494234] RBP: ffff8801d44bf7f8 R08: 0000000000000001 R09: 0000000000000000 [ 41.502037] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 41.509396] R13: ffff8801d44bfaa8 R14: ffffea0007191480 R15: ffffea0007190008 [ 41.516665] FS: 00007f213ea4f700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 41.524888] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.530879] CR2: 0000000020196000 CR3: 00000000b5234000 CR4: 00000000001606f0 [ 41.538185] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.545466] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.553000] Stack: [ 41.555194] ffffea0007190000 dffffc0000000000 ffff8801d44bfaa8 ffffea0007191480 [ 41.563303] ffff8801d44bf8e0 ffffffff812cc1bc 0000000000000001 ffff8801d44bf890 [ 41.571584] 0000000000000046 ffff8801d96dca00 00000000d40538d8 ffff8801d44bfab8 [ 41.579669] Call Trace: [ 41.582298] [] get_futex_key+0xadc/0xd80 [ 41.588014] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 41.594534] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 41.601490] [] futex_wait_setup+0xd9/0x330 [ 41.607387] [] ? futex_wake+0x460/0x460 [ 41.613045] [] ? __hrtimer_init+0x143/0x1e0 [ 41.619031] [] futex_wait+0x2af/0x600 [ 41.624496] [] ? futex_wait_setup+0x330/0x330 [ 41.630653] [] ? clock_was_set_work+0x30/0x30 [ 41.636802] [] do_futex+0x2a2/0x1770 [ 41.642217] [] ? exit_robust_list+0x220/0x220 [ 41.648378] [] ? vmacache_update+0xfe/0x130 [ 41.654355] [] ? __do_page_fault+0x385/0xa10 [ 41.660429] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 41.667626] [] ? ktime_add_safe+0xea/0x150 [ 41.673521] [] ? SyS_alarm+0x20/0x20 [ 41.678901] [] ? kvm_clock_read+0x23/0x40 [ 41.684707] [] ? kvm_clock_get_cycles+0x9/0x10 [ 41.690943] [] ? SyS_futex+0x284/0x300 [ 41.696481] [] SyS_futex+0x1f0/0x300 [ 41.701848] [] ? do_futex+0x1770/0x1770 [ 41.707479] [] ? retint_user+0x18/0x3c [ 41.713020] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 41.719707] [] entry_SYSCALL_64_fastpath+0x22/0x9e executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 41.726277] 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 [ 41.754728] RIP [] unlock_page+0x115/0x150 [ 41.760757] RSP [ 41.774237] ---[ end trace 22eeb47c4e47d427 ]--- [ 41.779020] Kernel panic - not syncing: Fatal exception [ 41.785202] Dumping ftrace buffer: [ 41.788733] (ftrace buffer empty) [ 41.792421] Kernel Offset: disabled [ 41.796027] Rebooting in 86400 seconds..