[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.463998] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.456418] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.994018] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.071244] random: sshd: uninitialized urandom read (32 bytes read, 118 bits of entropy available) [ 27.237334] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. [ 32.687326] random: nonblocking pool is initialized executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.786183] page:ffffea0007170000 count:2 mapcount:0 mapping: (null) index:0x0 [ 32.797656] flags: 0x8000000000004004(referenced|head) [ 32.803556] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 32.809874] ------------[ cut here ]------------ [ 32.814605] kernel BUG at mm/filemap.c:819! [ 32.818895] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 32.824705] Dumping ftrace buffer: [ 32.828213] (ftrace buffer empty) [ 32.831895] Modules linked in: [ 32.835178] CPU: 1 PID: 3853 Comm: syz-executor022 Not tainted 4.4.131-g834913c #30 [ 32.842941] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.852267] task: ffff8800bba44800 task.stack: ffff8800ac058000 [ 32.858294] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 32.866632] RSP: 0018:ffff8800ac05f760 EFLAGS: 00010293 [ 32.872053] RAX: ffffffff83a6e7c0 RBX: ffffea0007170000 RCX: 0000000000000000 [ 32.879295] RDX: 0000000000000000 RSI: ffffffff81513389 RDI: ffff8800bba450dc [ 32.886536] RBP: ffff8800ac05f780 R08: 0000000000000001 R09: 0000000000000000 [ 32.893778] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 32.901019] R13: ffff8800ac05fa30 R14: ffffea0007171480 R15: ffffea0007170008 [ 32.908261] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f7751b40 [ 32.916459] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.922314] CR2: 00000000204a4ff0 CR3: 00000000af73a000 CR4: 00000000001606f0 [ 32.929558] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.936802] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.944043] Stack: [ 32.946161] ffffea0007170000 dffffc0000000000 ffff8800ac05fa30 ffffea0007171480 [ 32.954138] ffff8800ac05f868 ffffffff812cc1bc 0000000000000001 ffff8800ac05f818 [ 32.962119] 0000000000000046 ffff8800bb9e5e00 00000000bba450d8 ffff8800ac05fa40 [ 32.970097] Call Trace: [ 32.972664] [] get_futex_key+0xadc/0xd80 [ 32.978353] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 [ 32.984816] [] ? _raw_spin_unlock_irqrestore+0x45/0x70 [ 32.991714] [] futex_wait_setup+0xd9/0x330 [ 32.997568] [] ? futex_wake+0x460/0x460 [ 33.003160] [] ? __hrtimer_init+0x143/0x1e0 [ 33.009101] [] futex_wait+0x2af/0x600 [ 33.014521] [] ? futex_wait_setup+0x330/0x330 [ 33.020637] [] ? native_set_pte_at+0xe0/0xe0 [ 33.026678] [] ? do_huge_pmd_anonymous_page+0x52d/0x9d0 [ 33.033664] [] ? clock_was_set_work+0x30/0x30 [ 33.039778] [] do_futex+0x2a2/0x1770 [ 33.045114] [] ? exit_robust_list+0x220/0x220 [ 33.051229] [] ? retint_kernel+0x2d/0x2d [ 33.056911] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.063728] [] ? ktime_add_safe+0xea/0x150 [ 33.069584] [] ? SyS_alarm+0x20/0x20 [ 33.074922] [] ? kvm_clock_read+0x23/0x40 [ 33.080691] [] ? kvm_clock_get_cycles+0x9/0x10 [ 33.086895] [] ? compat_SyS_futex+0x26d/0x2f0 [ 33.093185] [] compat_SyS_futex+0x1d9/0x2f0 [ 33.099130] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 33.106115] [] ? __bad_area_nosemaphore+0x21e/0x310 [ 33.112751] [] ? do_fast_syscall_32+0xdb/0x8b0 [ 33.118958] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 33.125942] [] do_fast_syscall_32+0x326/0x8b0 [ 33.132061] [] sysenter_flags_fixed+0xd/0x17 [ 33.138086] 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 [ 33.164853] RIP [] unlock_page+0x115/0x150 [ 33.170829] RSP [ 33.174788] ---[ end trace 6f012d8d5ceba416 ]--- [ 33.180025] Kernel panic - not syncing: Fatal exception [ 33.185773] Dumping ftrace buffer: [ 33.189283] (ftrace buffer empty) [ 33.192963] Kernel Offset: disabled [ 33.196556] Rebooting in 86400 seconds..