[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.145338] 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: [ 25.959280] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.295993] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.330481] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) [ 31.341559] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.17' (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 [ 39.369395] page:ffffea00071a0000 count:2 mapcount:0 mapping: (null) index:0x0 [ 39.377594] flags: 0x8000000000004004(referenced|head) [ 39.383204] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 39.389935] ------------[ cut here ]------------ [ 39.394667] kernel BUG at mm/filemap.c:819! [ 39.398958] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 39.404780] Dumping ftrace buffer: [ 39.408308] (ftrace buffer empty) [ 39.411992] Modules linked in: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.415276] CPU: 1 PID: 3859 Comm: syz-executor445 Not tainted 4.4.131-g6ec0e3f #34 [ 39.423041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.432383] task: ffff8801c754c800 task.stack: ffff8800ac1a0000 [ 39.438414] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 39.446741] RSP: 0018:ffff8800ac1a7760 EFLAGS: 00010293 [ 39.452173] RAX: ffffffff83a6e7c0 RBX: ffffea00071a0000 RCX: 0000000000000000 [ 39.459414] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8801c754d0dc executing program executing program executing program executing program [ 39.466656] RBP: ffff8800ac1a7780 R08: 0000000000000001 R09: 0000000000000000 [ 39.473897] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 39.481141] R13: ffff8800ac1a7a30 R14: ffffea00071a1480 R15: ffffea00071a0008 [ 39.488384] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77c7b40 [ 39.496584] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.502437] CR2: 00000000204a4ff0 CR3: 00000001c7a1c000 CR4: 00000000001606f0 [ 39.509683] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.516931] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.524178] Stack: [ 39.526299] ffffea00071a0000 dffffc0000000000 ffff8800ac1a7a30 ffffea00071a1480 [ 39.534282] ffff8800ac1a7868 ffffffff812cc1bc 0000000000000001 ffff8800ac1a7818 [ 39.542285] 0000000000000046 ffff8801d2354000 00000000c754d0d8 ffff8800ac1a7a40 [ 39.550262] Call Trace: [ 39.552822] [] get_futex_key+0xadc/0xd80 [ 39.558504] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 39.564970] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 39.571873] [] futex_wait_setup+0xd9/0x330 [ 39.577732] [] ? futex_wake+0x460/0x460 [ 39.583332] [] ? __hrtimer_init+0x143/0x1e0 [ 39.589280] [] futex_wait+0x2af/0x600 [ 39.594702] [] ? futex_wait_setup+0x330/0x330 [ 39.600822] [] ? native_set_pte_at+0xe0/0xe0 [ 39.606852] [] ? do_huge_pmd_anonymous_page+0x52d/0x9d0 [ 39.613840] [] ? clock_was_set_work+0x30/0x30 [ 39.620393] [] do_futex+0x2a2/0x1770 [ 39.625726] [] ? exit_robust_list+0x220/0x220 [ 39.631845] [] ? retint_kernel+0x2d/0x2d [ 39.637534] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 39.644359] [] ? ktime_add_safe+0xea/0x150 [ 39.650218] [] ? SyS_alarm+0x20/0x20 [ 39.655557] [] ? kvm_clock_read+0x23/0x40 [ 39.661329] [] ? kvm_clock_get_cycles+0x9/0x10 [ 39.667536] [] ? compat_SyS_futex+0x26d/0x2f0 [ 39.673655] [] compat_SyS_futex+0x1d9/0x2f0 [ 39.679602] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 39.686588] [] ? __bad_area_nosemaphore+0x21e/0x310 [ 39.693233] [] ? do_fast_syscall_32+0xdb/0x8b0 [ 39.699438] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 39.706433] [] do_fast_syscall_32+0x326/0x8b0 [ 39.712554] [] sysenter_flags_fixed+0xd/0x17 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 39.718580] 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 [ 39.745328] RIP [] unlock_page+0x115/0x150 [ 39.751308] RSP [ 39.756141] ---[ end trace 1dfdf55ee4d50643 ]--- [ 39.760919] Kernel panic - not syncing: Fatal exception [ 39.766644] Dumping ftrace buffer: [ 39.770159] (ftrace buffer empty) [ 39.773842] Kernel Offset: disabled [ 39.777444] Rebooting in 86400 seconds..