[....] 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[ 13.421443] 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: [ 16.117240] random: sshd: uninitialized urandom read (32 bytes read) [ 16.436898] random: sshd: uninitialized urandom read (32 bytes read) [ 16.947596] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.42' (ECDSA) to the list of known hosts. [ 22.587724] urandom_read: 1 callbacks suppressed [ 22.587727] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.674942] BUG: unable to handle kernel paging request at ffffeafff8e78020 [ 22.682375] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.688636] PGD 0 [ 22.690581] [ 22.692199] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.696666] Dumping ftrace buffer: [ 22.700182] (ftrace buffer empty) [ 22.703863] Modules linked in: [ 22.707161] CPU: 1 PID: 3682 Comm: syz-executor007 Not tainted 4.9.120-gf85543b #76 [ 22.714935] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.724266] task: ffff8801c3663000 task.stack: ffff8801c2c28000 [ 22.730349] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.739041] RSP: 0018:ffff8801c2c2f948 EFLAGS: 00010246 [ 22.744469] RAX: dffffc0000000000 RBX: ffffeafff8e78000 RCX: 0000000000000000 [ 22.751830] RDX: 1ffffd5fff1cf004 RSI: ffffffff814f5128 RDI: ffffeafff8e78000 [ 22.759074] RBP: ffff8801c2c2f970 R08: 0000000000033d00 R09: 0000000000000001 [ 22.766320] R10: ffff8801c3663000 R11: 0000000000000001 R12: ffff8801c2c2fc08 [ 22.773577] R13: ffffeafff8e78020 R14: ffffeafff8e78000 R15: 0000000000000001 [ 22.780825] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 22.789027] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.794922] CR2: ffffeafff8e78020 CR3: 00000001ccce6000 CR4: 00000000001606f0 [ 22.802186] Stack: [ 22.804311] ffffeafff8e78020 ffff8801c2c2fc08 ffff8801c7754800 ffffeafff8e78000 [ 22.812363] ffff8801c228d1b8 ffff8801c2c2f9c8 ffffffff8154bfcf ffff8801c2c2fc18 [ 22.820531] ffff8801c2c2fc10 ffff8801c2c2fc88 00003ffe39e001e0 00000001c7754000 [ 22.828515] Call Trace: [ 22.831090] [] zap_huge_pmd+0x16f/0x860 [ 22.836689] [] unmap_page_range+0x12ad/0x1730 [ 22.842806] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 22.849097] [] unmap_single_vma+0x101/0x260 [ 22.855042] [] unmap_vmas+0x102/0x1d0 [ 22.860468] [] exit_mmap+0x214/0x3f0 [ 22.865927] [] ? SyS_munmap+0xa0/0xa0 [ 22.871354] [] ? up_write+0x1a/0x60 [ 22.876609] [] mmput+0xf3/0x2d0 [ 22.881554] [] do_exit+0x906/0x27b0 [ 22.886825] [] ? release_task.part.19+0x1210/0x1210 [ 22.893478] [] ? up_write+0x1a/0x60 [ 22.898731] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.904849] [] ? mprotect_fixup+0x930/0x930 [ 22.910793] [] ? SyS_pwrite64+0xe8/0x170 [ 22.916475] [] do_group_exit+0x111/0x340 [ 22.922224] [] ? do_group_exit+0x340/0x340 [ 22.928092] [] SyS_exit_group+0x1d/0x20 [ 22.933711] [] do_syscall_64+0x1a6/0x490 [ 22.939399] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.946296] 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 [ 22.973289] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.979635] RSP [ 22.983239] CR2: ffffeafff8e78020 [ 22.986673] ---[ end trace 4068a4987edd050b ]--- [ 22.991398] Kernel panic - not syncing: Fatal exception [ 22.997087] Dumping ftrace buffer: [ 23.000607] (ftrace buffer empty) [ 23.004296] Kernel Offset: disabled [ 23.007912] Rebooting in 86400 seconds..