[....] 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[ 13.212751] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.736898] random: sshd: uninitialized urandom read (32 bytes read) [ 24.993694] random: sshd: uninitialized urandom read (32 bytes read) [ 25.387808] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 31.004448] urandom_read: 1 callbacks suppressed [ 31.004452] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.095548] BUG: unable to handle kernel paging request at ffffeafff8e80020 [ 31.103012] IP: [] page_remove_rmap+0x37/0x6d0 [ 31.109259] PGD 0 [ 31.111208] [ 31.112903] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.117378] Dumping ftrace buffer: [ 31.120889] (ftrace buffer empty) [ 31.124572] Modules linked in: [ 31.127860] CPU: 1 PID: 3799 Comm: syz-executor692 Not tainted 4.9.122-g54068d6 #26 [ 31.135631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.145008] task: ffff8801b67c3000 task.stack: ffff8801d9488000 [ 31.151048] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 31.159725] RSP: 0018:ffff8801d948f948 EFLAGS: 00010246 [ 31.165150] RAX: dffffc0000000000 RBX: ffffeafff8e80000 RCX: ffffea0006d28000 [ 31.172394] RDX: 1ffffd5fff1d0004 RSI: ffffffff814f5918 RDI: ffffeafff8e80000 [ 31.179666] RBP: ffff8801d948f970 R08: 0000000000033f60 R09: 0000000000000001 [ 31.187023] R10: ffff8801b67c3000 R11: 0000000000000001 R12: ffff8801d948fc08 [ 31.194275] R13: ffffeafff8e80020 R14: ffffeafff8e80000 R15: 0000000000000001 [ 31.201522] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.209720] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.215574] CR2: ffffeafff8e80020 CR3: 00000001c3824000 CR4: 00000000001606f0 [ 31.222819] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.230074] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.237317] Stack: [ 31.239439] ffffeafff8e80020 ffff8801d948fc08 ffff8801bdb93800 ffffeafff8e80000 [ 31.247438] ffff8801b6364cb8 ffff8801d948f9c8 ffffffff8154cb8f ffff8801d948fc18 [ 31.255433] ffff8801d948fc10 ffff8801d948fc88 00003ffe3a0001e0 00000001bdb93000 [ 31.263421] Call Trace: [ 31.265989] [] zap_huge_pmd+0x16f/0x860 [ 31.271592] [] unmap_page_range+0x12ad/0x1730 [ 31.277712] [] ? vm_normal_page_pmd+0x310/0x310 [ 31.284008] [] unmap_single_vma+0x101/0x260 [ 31.289955] [] unmap_vmas+0x102/0x1d0 [ 31.295388] [] exit_mmap+0x214/0x3f0 [ 31.300727] [] ? SyS_munmap+0xa0/0xa0 [ 31.306155] [] ? up_write+0x1a/0x60 [ 31.311408] [] mmput+0xf3/0x2d0 [ 31.316314] [] do_exit+0x906/0x27b0 [ 31.321572] [] ? release_task.part.19+0x1210/0x1210 [ 31.328216] [] ? up_write+0x1a/0x60 [ 31.333490] [] ? do_mprotect_pkey+0x71d/0x890 [ 31.339616] [] ? mprotect_fixup+0x930/0x930 [ 31.345565] [] do_group_exit+0x111/0x340 [ 31.351250] [] ? do_group_exit+0x340/0x340 [ 31.357113] [] SyS_exit_group+0x1d/0x20 [ 31.362713] [] do_syscall_64+0x1a6/0x490 [ 31.368398] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.375399] 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 [ 31.402185] RIP [] page_remove_rmap+0x37/0x6d0 [ 31.408516] RSP [ 31.412113] CR2: ffffeafff8e80020 [ 31.415547] ---[ end trace 8c4b80c07f9acc0c ]--- [ 31.420276] Kernel panic - not syncing: Fatal exception [ 31.425913] Dumping ftrace buffer: [ 31.429429] (ftrace buffer empty) [ 31.433113] Kernel Offset: disabled [ 31.436716] Rebooting in 86400 seconds..