[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.186581] 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: [ 25.524872] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.061063] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.155588] random: sshd: uninitialized urandom read (32 bytes read, 128 bits of entropy available) [ 27.176799] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.60' (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 [ 47.766334] page:ffffea0002dc8000 count:2 mapcount:0 mapping: (null) index:0x0 [ 47.774926] flags: 0x4000000000004004(referenced|head) [ 47.780698] page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) [ 47.787045] ------------[ cut here ]------------ [ 47.791771] kernel BUG at mm/filemap.c:819! [ 47.796062] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 47.801882] Dumping ftrace buffer: [ 47.805391] (ftrace buffer empty) [ 47.809085] 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 [ 47.812370] CPU: 0 PID: 3840 Comm: syz-executor566 Not tainted 4.4.131-g6ec0e3f #34 [ 47.820132] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.829458] task: ffff8800addae000 task.stack: ffff8801da3e8000 [ 47.835494] RIP: 0010:[] [] unlock_page+0x115/0x150 [ 47.843817] RSP: 0018:ffff8801da3ef838 EFLAGS: 00010293 [ 47.849238] RAX: ffffffff83a6e7c0 RBX: ffffea0002dc8000 RCX: 0000000000000000 [ 47.856486] RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8800addae8dc executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.863726] RBP: ffff8801da3ef858 R08: 0000000000000001 R09: 0000000000000000 [ 47.870969] R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 [ 47.878236] R13: ffff8801da3efa78 R14: ffffea0002dc9480 R15: ffffea0002dc8008 [ 47.885483] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f77f3b40 [ 47.894493] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 47.900355] CR2: 0000000020000040 CR3: 00000000b5b29000 CR4: 00000000001606f0 [ 47.907601] 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 [ 47.914852] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.922093] Stack: [ 47.924213] ffffea0002dc8000 dffffc0000000000 ffff8801da3efa78 ffffea0002dc9480 [ 47.932214] ffff8801da3ef940 ffffffff812cc1bc ffff8800addae902 ffff8800addae901 [ 47.940194] ffff8800addae8e0 ffff8800ae537200 00000000addae902 ffff8801da3efa88 [ 47.948275] Call Trace: [ 47.950836] [] get_futex_key+0xadc/0xd80 [ 47.956519] [] ? futex_lock_pi_atomic+0x2b0/0x2b0 executing program executing program executing program executing program executing program executing program executing program executing program [ 47.962984] [] futex_requeue+0x1e7/0x1690 [ 47.968754] [] ? debug_check_no_locks_freed+0x210/0x210 [ 47.975743] [] ? __might_fault+0x114/0x1d0 [ 47.981627] [] ? futex_lock_pi+0x600/0x600 [ 47.987489] [] ? __might_fault+0x18e/0x1d0 [ 47.993344] [] ? __might_fault+0xe4/0x1d0 [ 47.999209] [] do_futex+0x202/0x1770 [ 48.004545] [] ? recalc_sigpending+0x76/0xa0 [ 48.010580] [] ? __set_task_blocked+0x19b/0x230 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 [ 48.016871] [] ? exit_robust_list+0x220/0x220 [ 48.022986] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 48.029796] [] ? _raw_spin_unlock_irq+0x38/0x50 [ 48.036085] [] ? __set_current_blocked+0x80/0xa0 [ 48.042461] [] ? signal_setup_done+0xbc/0x290 [ 48.048575] [] ? set_current_blocked+0x40/0x40 [ 48.054776] [] ? do_signal+0x3fa/0x1d30 [ 48.060372] [] ? is_prefetch.isra.20+0x390/0x390 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 48.066750] [] ? setup_sigcontext+0x780/0x780 [ 48.072867] [] compat_SyS_futex+0x1d9/0x2f0 [ 48.078809] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 48.085793] [] ? __bad_area_nosemaphore+0x21e/0x310 [ 48.092436] [] ? do_fast_syscall_32+0xdb/0x8b0 [ 48.098639] [] ? compat_SyS_get_robust_list+0x310/0x310 [ 48.105623] [] do_fast_syscall_32+0x326/0x8b0 [ 48.111740] [] sysenter_flags_fixed+0xd/0x17 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 48.117764] 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 [ 48.144571] RIP [] unlock_page+0x115/0x150 [ 48.150580] RSP [ 48.154528] ---[ end trace 3663976cc053935c ]--- [ 48.159326] Kernel panic - not syncing: Fatal exception [ 48.165097] Dumping ftrace buffer: [ 48.168610] (ftrace buffer empty) [ 48.172380] Kernel Offset: disabled [ 48.175989] Rebooting in 86400 seconds..