[....] 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[ 15.328970] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.151811] random: sshd: uninitialized urandom read (32 bytes read) [ 20.406770] random: sshd: uninitialized urandom read (32 bytes read) [ 20.900148] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts. [ 26.587514] urandom_read: 1 callbacks suppressed [ 26.587517] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.670713] BUG: unable to handle kernel paging request at ffffeafff9188020 [ 26.678073] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.684323] PGD 0 [ 26.686421] [ 26.688046] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.692619] Dumping ftrace buffer: [ 26.696133] (ftrace buffer empty) [ 26.699929] Modules linked in: [ 26.703225] CPU: 0 PID: 3803 Comm: syz-executor824 Not tainted 4.9.122-g54068d6 #26 [ 26.710992] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.720349] task: ffff8801b6de8000 task.stack: ffff8801b5bb0000 [ 26.726595] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.735273] RSP: 0018:ffff8801b5bb7948 EFLAGS: 00010246 [ 26.740707] RAX: dffffc0000000000 RBX: ffffeafff9188000 RCX: 0000000000000000 [ 26.747957] RDX: 1ffffd5fff231004 RSI: ffffffff814f5918 RDI: ffffeafff9188000 [ 26.755203] RBP: ffff8801b5bb7970 R08: 0000000000033d40 R09: 0000000000000001 [ 26.762449] R10: ffff8801b6de8000 R11: 0000000000000001 R12: ffff8801b5bb7c08 [ 26.769693] R13: ffffeafff9188020 R14: ffffeafff9188000 R15: 0000000000000001 [ 26.776952] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.785157] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.791015] CR2: ffffeafff9188020 CR3: 00000001c6221000 CR4: 00000000001606f0 [ 26.798261] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.805506] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.812750] Stack: [ 26.814872] ffffeafff9188020 ffff8801b5bb7c08 ffff8801cb024800 ffffeafff9188000 [ 26.822930] ffff8801b7f45c60 ffff8801b5bb79c8 ffffffff8154cb8f ffff8801b5bb7c18 [ 26.831013] ffff8801b5bb7c10 ffff8801b5bb7c88 00003ffe462001e0 00000001cb024000 [ 26.839016] Call Trace: [ 26.841609] [] zap_huge_pmd+0x16f/0x860 [ 26.847215] [] unmap_page_range+0x12ad/0x1730 [ 26.853353] [] ? vm_normal_page_pmd+0x310/0x310 [ 26.859755] [] unmap_single_vma+0x101/0x260 [ 26.865707] [] unmap_vmas+0x102/0x1d0 [ 26.871134] [] exit_mmap+0x214/0x3f0 [ 26.876473] [] ? SyS_munmap+0xa0/0xa0 [ 26.881901] [] ? up_write+0x1a/0x60 [ 26.887272] [] mmput+0xf3/0x2d0 [ 26.892184] [] do_exit+0x906/0x27b0 [ 26.897436] [] ? release_task.part.19+0x1210/0x1210 [ 26.904078] [] ? up_write+0x1a/0x60 [ 26.909326] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.915444] [] ? mprotect_fixup+0x930/0x930 [ 26.921389] [] do_group_exit+0x111/0x340 [ 26.927073] [] ? do_group_exit+0x340/0x340 [ 26.932930] [] SyS_exit_group+0x1d/0x20 [ 26.938549] [] do_syscall_64+0x1a6/0x490 [ 26.944237] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.951139] 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 [ 26.978325] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.984652] RSP [ 26.988250] CR2: ffffeafff9188020 [ 26.991679] ---[ end trace 0f39a15fd9495cba ]--- [ 26.996407] Kernel panic - not syncing: Fatal exception [ 27.002131] Dumping ftrace buffer: [ 27.005654] (ftrace buffer empty) [ 27.009337] Kernel Offset: disabled [ 27.012936] Rebooting in 86400 seconds..