[....] 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[ 20.463236] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.649245] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 20.998537] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.056520] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.17' (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 [ 27.845299] page:ffffea0002dc8000 count:2 mapcount:0 mapping: (null) index:0x0 [ 27.861727] flags: 0x4000000000004004(referenced|head) [ 27.867624] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 27.874535] ------------[ cut here ]------------ [ 27.879275] kernel BUG at mm/filemap.c:819! [ 27.883569] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 27.889408] Dumping ftrace buffer: [ 27.892918] (ftrace buffer empty) [ 27.896604] Modules linked in: [ 27.899895] CPU: 1 PID: 3773 Comm: syz-executor976 Not tainted 4.4.129-g23eaecc #26 [ 27.907659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.916984] task: ffff8800b02e4800 task.stack: ffff8801cab00000 [ 27.923012] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 27.931336] RSP: 0018:ffff8801cab07760 EFLAGS: 00010293 [ 27.936760] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc8000 RCX: 0000000000000000 [ 27.944002] RDX: 0000000000000000 RSI: ffffffff81513399 RDI: ffff8800b02e50dc [ 27.951243] RBP: ffff8801cab07780 R08: 0000000000000001 R09: 0000000000000000 [ 27.958485] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 27.965727] R13: ffff8801cab07a30 R14: ffffea0002dc9480 R15: ffffea0002dc8008 [ 27.972971] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77a7b40 [ 27.981167] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.987019] CR2: 00000000204a4ff0 CR3: 00000001d0250000 CR4: 00000000001606f0 [ 27.994265] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.001510] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.008919] Stack: [ 28.011039] ffffea0002dc8000 dffffc0000000000 ffff8801cab07a30 ffffea0002dc9480 [ 28.019015] ffff8801cab07868 ffffffff812cc1bc 0000000000000001 ffff8801cab07818 [ 28.027005] 0000000000000046 ffff8801ca9b0a00 00000000b02e50d8 ffff8801cab07a40 [ 28.034986] Call Trace: [ 28.037549] [] get_futex_key+0xadc/0xd80 [ 28.043230] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 28.049695] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.056595] [] futex_wait_setup+0xd9/0x330 [ 28.062458] [] ? futex_wake+0x460/0x460 [ 28.068052] [] ? __hrtimer_init+0x143/0x1e0 [ 28.073993] [] futex_wait+0x2af/0x600 [ 28.079413] [] ? futex_wait_setup+0x330/0x330 [ 28.085531] [] ? native_set_pte_at+0xe0/0xe0 [ 28.091563] [] ? do_huge_pmd_anonymous_page+0x52d/0x9d0 [ 28.098547] [] ? clock_was_set_work+0x30/0x30 [ 28.104665] [] do_futex+0x2a2/0x1770 [ 28.110000] [] ? exit_robust_list+0x220/0x220 [ 28.116114] [] ? retint_kernel+0x2d/0x2d [ 28.121798] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.128611] [] ? ktime_add_safe+0xea/0x150 [ 28.134465] [] ? SyS_alarm+0x20/0x20 [ 28.139809] [] ? kvm_clock_read+0x23/0x40 [ 28.145580] [] ? kvm_clock_get_cycles+0x9/0x10 [ 28.151785] [] ? compat_SyS_futex+0x26d/0x2f0 [ 28.157901] [] compat_SyS_futex+0x1d9/0x2f0 [ 28.163846] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 28.170831] [] ? __bad_area_nosemaphore+0x21e/0x310 [ 28.177468] [] ? do_fast_syscall_32+0xdb/0x8b0 [ 28.183671] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 28.190654] [] do_fast_syscall_32+0x326/0x8b0 [ 28.196770] [] sysenter_flags_fixed+0xd/0x17 [ 28.202802] 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 [ 28.229592] RIP [] unlock_page+0x115/0x150 [ 28.235568] RSP [ 28.239550] ---[ end trace 493cca2c7e45ccf8 ]--- [ 28.244572] Kernel panic - not syncing: Fatal exception [ 28.250396] Dumping ftrace buffer: [ 28.253915] (ftrace buffer empty) [ 28.257688] Kernel Offset: disabled [ 28.261286] Rebooting in 86400 seconds..