[....] 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[ 12.758412] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.479753] random: sshd: uninitialized urandom read (32 bytes read) [ 20.807727] random: sshd: uninitialized urandom read (32 bytes read) [ 21.293873] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 26.988875] urandom_read: 1 callbacks suppressed [ 26.988878] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.075806] BUG: unable to handle kernel paging request at ffffeafff8ef0020 [ 27.083313] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.089566] PGD 0 [ 27.091512] [ 27.093142] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.097615] Dumping ftrace buffer: [ 27.101129] (ftrace buffer empty) [ 27.104816] Modules linked in: [ 27.108113] CPU: 1 PID: 3797 Comm: syz-executor794 Not tainted 4.9.121-g681e57b #77 [ 27.115923] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.125265] task: ffff8801b8c38000 task.stack: ffff8801d96b0000 [ 27.131426] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.140172] RSP: 0018:ffff8801d96b7948 EFLAGS: 00010246 [ 27.145601] RAX: dffffc0000000000 RBX: ffffeafff8ef0000 RCX: 0000000000000000 [ 27.152857] RDX: 1ffffd5fff1de004 RSI: ffffffff814f5278 RDI: ffffeafff8ef0000 [ 27.160147] RBP: ffff8801d96b7970 R08: 0000000000033f00 R09: 0000000000000001 [ 27.167404] R10: ffff8801b8c38000 R11: 0000000000000001 R12: ffff8801d96b7c08 [ 27.174653] R13: ffffeafff8ef0020 R14: ffffeafff8ef0000 R15: 0000000000000001 [ 27.181900] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.190204] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.196065] CR2: ffffeafff8ef0020 CR3: 00000001c5e5e000 CR4: 00000000001606f0 [ 27.203313] Stack: [ 27.205453] ffffeafff8ef0020 ffff8801d96b7c08 ffff8801c2a8a800 ffffeafff8ef0000 [ 27.213505] ffff8801b92d6f78 ffff8801d96b79c8 ffffffff8154c20f ffff8801d96b7c18 [ 27.221564] ffff8801d96b7c10 ffff8801d96b7c88 00003ffe3bc001e0 00000001c2a8a000 [ 27.229567] Call Trace: [ 27.232137] [] zap_huge_pmd+0x16f/0x860 [ 27.237788] [] unmap_page_range+0x12ad/0x1730 [ 27.243923] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.250225] [] unmap_single_vma+0x101/0x260 [ 27.256184] [] unmap_vmas+0x102/0x1d0 [ 27.261618] [] exit_mmap+0x214/0x3f0 [ 27.266966] [] ? SyS_munmap+0xa0/0xa0 [ 27.272525] [] ? up_write+0x1a/0x60 [ 27.277790] [] mmput+0xf3/0x2d0 [ 27.282701] [] do_exit+0x906/0x27b0 [ 27.288006] [] ? release_task.part.19+0x1210/0x1210 [ 27.294699] [] ? up_write+0x1a/0x60 [ 27.299960] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.306122] [] ? mprotect_fixup+0x930/0x930 [ 27.312234] [] do_group_exit+0x111/0x340 [ 27.317928] [] ? do_group_exit+0x340/0x340 [ 27.323798] [] SyS_exit_group+0x1d/0x20 [ 27.329400] [] do_syscall_64+0x1a6/0x490 [ 27.335087] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.341991] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 27.369065] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.375413] RSP [ 27.379013] CR2: ffffeafff8ef0020 [ 27.382447] ---[ end trace 98de74745da235f6 ]--- [ 27.387183] Kernel panic - not syncing: Fatal exception [ 27.392790] Dumping ftrace buffer: [ 27.396308] (ftrace buffer empty) [ 27.399997] Kernel Offset: disabled [ 27.403604] Rebooting in 86400 seconds..