[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.937702] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.216360] random: sshd: uninitialized urandom read (32 bytes read) [ 20.498644] random: sshd: uninitialized urandom read (32 bytes read) [ 21.010173] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 26.798100] urandom_read: 1 callbacks suppressed [ 26.798104] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.890813] BUG: unable to handle kernel paging request at ffffeafff9290020 [ 26.898196] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.904460] PGD 0 [ 26.906409] [ 26.908035] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.912510] Dumping ftrace buffer: [ 26.916032] (ftrace buffer empty) [ 26.919721] Modules linked in: [ 26.923020] CPU: 0 PID: 3796 Comm: syz-executor455 Not tainted 4.9.122-g54068d6 #26 [ 26.930790] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.940164] task: ffff8801b8ac9800 task.stack: ffff8801d9be8000 [ 26.946203] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.954889] RSP: 0018:ffff8801d9bef948 EFLAGS: 00010246 [ 26.960317] RAX: dffffc0000000000 RBX: ffffeafff9290000 RCX: ffffea0006d68000 [ 26.967566] RDX: 1ffffd5fff252004 RSI: ffffffff814f5918 RDI: ffffeafff9290000 [ 26.974818] RBP: ffff8801d9bef970 R08: 0000000000033940 R09: 0000000000000001 [ 26.982066] R10: ffff8801b8ac9800 R11: 0000000000000001 R12: ffff8801d9befc08 [ 26.989323] R13: ffffeafff9290020 R14: ffffeafff9290000 R15: 0000000000000001 [ 26.996727] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.004940] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.010801] CR2: ffffeafff9290020 CR3: 00000001c918f000 CR4: 00000000001606f0 [ 27.018052] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.025312] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.032655] Stack: [ 27.034791] ffffeafff9290020 ffff8801d9befc08 ffff8801cb3b0808 ffffeafff9290000 [ 27.042900] ffff8801c73de210 ffff8801d9bef9c8 ffffffff8154cb8f ffff8801d9befc18 [ 27.050907] ffff8801d9befc10 ffff8801d9befc88 00003ffe4a4001a0 00000001cb3b0000 [ 27.058933] Call Trace: [ 27.061513] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 27.067131] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 27.073261] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 27.079603] [<ffffffff83a003ca>] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 27.086521] [<ffffffff81237cbb>] ? trace_hardirqs_on_caller+0x38b/0x590 [ 27.093485] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 27.099442] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 27.104871] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 27.110212] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 27.115647] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 27.120903] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 27.125811] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 27.131440] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 27.138092] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 27.143346] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 27.149472] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 27.155423] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 27.161110] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 27.166978] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 27.172580] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 27.178277] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.185180] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 27.212455] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 27.218901] RSP <ffff8801d9bef948> [ 27.222503] CR2: ffffeafff9290020 [ 27.225937] ---[ end trace 7a1697b81404aff5 ]--- [ 27.230665] Kernel panic - not syncing: Fatal exception [ 27.236353] Dumping ftrace buffer: [ 27.239875] (ftrace buffer empty) [ 27.243565] Kernel Offset: disabled [ 27.247183] Rebooting in 86400 seconds..