[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.238569] 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: [ 21.626006] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.933301] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.975156] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) [ 31.098016] random: sshd: uninitialized urandom read (32 bytes read, 126 bits of entropy available) [ 32.823461] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.43' (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 [ 36.669699] page:ffffea0002dc0000 count:2 mapcount:0 mapping: (null) index:0x0 [ 36.678312] flags: 0x4000000000004004(referenced|head) [ 36.684326] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 36.690662] ------------[ cut here ]------------ [ 36.695390] kernel BUG at mm/filemap.c:819! [ 36.699681] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 36.705481] Dumping ftrace buffer: [ 36.708991] (ftrace buffer empty) [ 36.712673] Modules linked in: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.715956] CPU: 1 PID: 3830 Comm: syz-executor451 Not tainted 4.4.130-g12ef385 #27 [ 36.723719] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.733044] task: ffff8800ad8b1800 task.stack: ffff8800bb310000 [ 36.739076] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 36.747400] RSP: 0018:ffff8800bb317760 EFLAGS: 00010293 [ 36.752819] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc0000 RCX: 0000000000000000 [ 36.760063] RDX: 0000000000000000 RSI: ffffffff81513389 RDI: ffff8800ad8b20dc executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.767310] RBP: ffff8800bb317780 R08: 0000000000000001 R09: 0000000000000000 [ 36.774550] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 36.781791] R13: ffff8800bb317a30 R14: ffffea0002dc1480 R15: ffffea0002dc0008 [ 36.789031] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77ccb40 [ 36.797231] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 36.803080] CR2: 00000000204a4ff0 CR3: 00000000b34ab000 CR4: 00000000001606f0 [ 36.810323] 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 executing program executing program executing program [ 36.817565] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.824801] Stack: [ 36.826918] ffffea0002dc0000 dffffc0000000000 ffff8800bb317a30 ffffea0002dc1480 [ 36.834905] ffff8800bb317868 ffffffff812cc1bc 0000000000000001 ffff8800bb317818 [ 36.842874] 0000000000000046 ffff8801d9b5a800 00000000ad8b20d8 ffff8800bb317a40 [ 36.850843] Call Trace: [ 36.853408] [] get_futex_key+0xadc/0xd80 [ 36.859091] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.865557] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 36.872452] [] futex_wait_setup+0xd9/0x330 [ 36.878308] [] ? futex_wake+0x460/0x460 [ 36.883901] [] ? __hrtimer_init+0x143/0x1e0 [ 36.889842] [] futex_wait+0x2af/0x600 [ 36.895263] [] ? futex_wait_setup+0x330/0x330 [ 36.901380] [] ? native_set_pte_at+0xe0/0xe0 [ 36.907420] [] ? do_huge_pmd_anonymous_page+0x52d/0x9d0 [ 36.914400] [] ? clock_was_set_work+0x30/0x30 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.920514] [] do_futex+0x2a2/0x1770 [ 36.925846] [] ? exit_robust_list+0x220/0x220 [ 36.931962] [] ? retint_kernel+0x2d/0x2d [ 36.937647] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 36.944455] [] ? ktime_add_safe+0xea/0x150 [ 36.950307] [] ? SyS_alarm+0x20/0x20 [ 36.955644] [] ? kvm_clock_read+0x23/0x40 [ 36.961425] [] ? kvm_clock_get_cycles+0x9/0x10 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.967627] [] ? compat_SyS_futex+0x26d/0x2f0 [ 36.973739] [] compat_SyS_futex+0x1d9/0x2f0 [ 36.979680] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 36.986662] [] ? __bad_area_nosemaphore+0x21e/0x310 [ 36.993300] [] ? do_fast_syscall_32+0xdb/0x8b0 [ 36.999507] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 37.006490] [] do_fast_syscall_32+0x326/0x8b0 [ 37.012604] [] sysenter_flags_fixed+0xd/0x17 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 37.018630] Code: e8 48 8d 04 c0 49 8d 3c c6 e8 08 bf df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 9a 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 [ 37.045269] RIP [] unlock_page+0x115/0x150 [ 37.051246] RSP [ 37.055072] ---[ end trace f7f1500ebaf6b2f9 ]--- [ 37.059806] Kernel panic - not syncing: Fatal exception [ 37.065512] Dumping ftrace buffer: [ 37.069026] (ftrace buffer empty) [ 37.072707] Kernel Offset: disabled [ 37.076304] Rebooting in 86400 seconds..