[....] 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[ 13.858457] 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: [ 18.345443] random: sshd: uninitialized urandom read (32 bytes read) [ 18.677992] random: sshd: uninitialized urandom read (32 bytes read) [ 19.150412] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 24.819148] urandom_read: 1 callbacks suppressed [ 24.819151] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.902499] BUG: unable to handle kernel paging request at ffffeafff90c8020 [ 24.909852] IP: [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 24.916106] PGD 0 [ 24.918050] [ 24.919672] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.924140] Dumping ftrace buffer: [ 24.927653] (ftrace buffer empty) [ 24.931341] Modules linked in: [ 24.934660] CPU: 0 PID: 3786 Comm: syz-executor504 Not tainted 4.9.121-g681e57b #77 [ 24.942426] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.951753] task: ffff8801bb336000 task.stack: ffff8801b9b18000 [ 24.957874] RIP: 0010:[<ffffffff814f5297>] [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 24.966781] RSP: 0018:ffff8801b9b1f948 EFLAGS: 00010246 [ 24.972227] RAX: dffffc0000000000 RBX: ffffeafff90c8000 RCX: 0000000000000000 [ 24.979475] RDX: 1ffffd5fff219004 RSI: ffffffff814f5278 RDI: ffffeafff90c8000 [ 24.986736] RBP: ffff8801b9b1f970 R08: 00000000000341c0 R09: 0000000000000001 [ 24.993981] R10: ffff8801bb336000 R11: 0000000000000001 R12: ffff8801b9b1fc08 [ 25.001232] R13: ffffeafff90c8020 R14: ffffeafff90c8000 R15: 0000000000000001 [ 25.008503] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.016703] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.022560] CR2: ffffeafff90c8020 CR3: 00000001c6c5a000 CR4: 00000000001606f0 [ 25.029817] Stack: [ 25.031940] ffffeafff90c8020 ffff8801b9b1fc08 ffff8801cb2fe800 ffffeafff90c8000 [ 25.039941] ffff8801c9f8ef78 ffff8801b9b1f9c8 ffffffff8154c20f ffff8801b9b1fc18 [ 25.048055] ffff8801b9b1fc10 ffff8801b9b1fc88 00003ffe432001e0 00000001cb2fe000 [ 25.056099] Call Trace: [ 25.058659] [<ffffffff8154c20f>] zap_huge_pmd+0x16f/0x860 [ 25.064255] [<ffffffff814ca95d>] unmap_page_range+0x12ad/0x1730 [ 25.070373] [<ffffffff814c96b0>] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 25.076670] [<ffffffff814caee1>] unmap_single_vma+0x101/0x260 [ 25.082637] [<ffffffff814cb822>] unmap_vmas+0x102/0x1d0 [ 25.088060] [<ffffffff814e4214>] exit_mmap+0x214/0x3f0 [ 25.093398] [<ffffffff814e4000>] ? SyS_munmap+0xa0/0xa0 [ 25.098837] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 25.104100] [<ffffffff8112d6f3>] mmput+0xf3/0x2d0 [ 25.109003] [<ffffffff81142c26>] do_exit+0x906/0x27b0 [ 25.114250] [<ffffffff81142320>] ? release_task.part.19+0x1210/0x1210 [ 25.120889] [<ffffffff8122e15a>] ? up_write+0x1a/0x60 [ 25.126138] [<ffffffff814ec78d>] ? do_mprotect_pkey+0x71d/0x890 [ 25.132275] [<ffffffff814ec070>] ? mprotect_fixup+0x930/0x930 [ 25.138221] [<ffffffff81148de1>] do_group_exit+0x111/0x340 [ 25.143933] [<ffffffff81149010>] ? do_group_exit+0x340/0x340 [ 25.149976] [<ffffffff8114902d>] SyS_exit_group+0x1d/0x20 [ 25.155577] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 25.161264] [<ffffffff839ffcd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.168158] 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 [ 25.195047] RIP [<ffffffff814f5297>] page_remove_rmap+0x37/0x6d0 [ 25.201367] RSP <ffff8801b9b1f948> [ 25.204964] CR2: ffffeafff90c8020 [ 25.208388] ---[ end trace bbf2b8f9e9dbffdd ]--- [ 25.213115] Kernel panic - not syncing: Fatal exception [ 25.218836] Dumping ftrace buffer: [ 25.222378] (ftrace buffer empty) [ 25.226060] Kernel Offset: disabled [ 25.229662] Rebooting in 86400 seconds..