[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.545832] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.036987] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.339336] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.361304] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) [ 22.522005] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. [ 28.024518] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.135411] page:ffffea0007300000 count:2 mapcount:0 mapping: (null) index:0x0 [ 28.144291] flags: 0x8000000000004004(referenced|head) [ 28.149923] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 28.156295] ------------[ cut here ]------------ [ 28.161029] kernel BUG at mm/filemap.c:819! [ 28.165323] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 28.171156] Dumping ftrace buffer: [ 28.174669] (ftrace buffer empty) [ 28.178356] Modules linked in: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.181641] CPU: 0 PID: 3720 Comm: syz-executor992 Not tainted 4.4.131-g6ec0e3f #34 [ 28.189406] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.198737] task: ffff8801cd813000 task.stack: ffff8801cd860000 [ 28.204780] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 28.213116] RSP: 0018:ffff8801cd867760 EFLAGS: 00010293 [ 28.218534] RAX: ffffffff83a6e7c0 RBX: ffffea0007300000 RCX: 0000000000000000 [ 28.225784] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8801cd8138dc executing program executing program executing program executing program executing program executing program executing program executing program [ 28.233038] RBP: ffff8801cd867780 R08: 0000000000000001 R09: 0000000000000000 [ 28.240296] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 28.247544] R13: ffff8801cd867a30 R14: ffffea0007301480 R15: ffffea0007300008 [ 28.254797] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77d4b40 [ 28.262999] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.268859] CR2: 00000000204a4ff0 CR3: 00000001d272b000 CR4: 00000000001606f0 [ 28.276115] 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 [ 28.283369] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.290625] Stack: [ 28.292746] ffffea0007300000 dffffc0000000000 ffff8801cd867a30 ffffea0007301480 [ 28.300747] ffff8801cd867868 ffffffff812cc1bc 0000000000000001 ffff8801cd867818 [ 28.308758] 0000000000000046 ffff8800b1813700 00000000cd8138d8 ffff8801cd867a40 [ 28.316755] Call Trace: [ 28.319330] [] get_futex_key+0xadc/0xd80 [ 28.325029] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 executing program executing program executing program executing program executing program executing program [ 28.331508] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 28.338426] [] futex_wait_setup+0xd9/0x330 [ 28.344283] [] ? futex_wake+0x460/0x460 [ 28.349882] [] ? __hrtimer_init+0x143/0x1e0 [ 28.355836] [] futex_wait+0x2af/0x600 [ 28.361959] [] ? futex_wait_setup+0x330/0x330 [ 28.368086] [] ? native_set_pte_at+0xe0/0xe0 [ 28.374121] [] ? do_huge_pmd_anonymous_page+0x52d/0x9d0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 28.381113] [] ? clock_was_set_work+0x30/0x30 [ 28.387243] [] do_futex+0x2a2/0x1770 [ 28.392588] [] ? exit_robust_list+0x220/0x220 [ 28.398715] [] ? retint_kernel+0x2d/0x2d [ 28.404412] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.411237] [] ? ktime_add_safe+0xea/0x150 [ 28.417104] [] ? SyS_alarm+0x20/0x20 [ 28.422453] [] ? kvm_clock_read+0x23/0x40 [ 28.428239] [] ? 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 [ 28.434447] [] ? compat_SyS_futex+0x26d/0x2f0 [ 28.440577] [] compat_SyS_futex+0x1d9/0x2f0 [ 28.446524] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 28.453517] [] ? __bad_area_nosemaphore+0x21e/0x310 [ 28.460163] [] ? do_fast_syscall_32+0xdb/0x8b0 [ 28.466372] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 28.473357] [] do_fast_syscall_32+0x326/0x8b0 [ 28.479485] [] sysenter_flags_fixed+0xd/0x17 executing program executing program executing program executing program executing program executing program executing program executing program [ 28.485516] 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 [ 28.512555] RIP [] unlock_page+0x115/0x150 [ 28.518549] RSP [ 28.522456] ---[ end trace c67cc080d1fe4c42 ]--- [ 28.527210] Kernel panic - not syncing: Fatal exception [ 28.533070] Dumping ftrace buffer: [ 28.536600] (ftrace buffer empty) [ 28.540284] Kernel Offset: disabled [ 28.543885] Rebooting in 86400 seconds..