[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.107580] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 13.333182] random: sshd: uninitialized urandom read (32 bytes read) [ 13.517071] random: sshd: uninitialized urandom read (32 bytes read) [ 14.308787] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.915904] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.4' (ECDSA) to the list of known hosts. [ 22.492079] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.571736] BUG: unable to handle kernel paging request at ffffeafff9080020 [ 22.579105] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.585359] PGD 0 [ 22.587313] [ 22.588963] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.593449] Dumping ftrace buffer: [ 22.596961] (ftrace buffer empty) [ 22.600647] Modules linked in: [ 22.603938] CPU: 0 PID: 3777 Comm: syz-executor044 Not tainted 4.9.121-g681e57b #77 [ 22.611706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.621040] task: ffff8801baff0000 task.stack: ffff8801b6b10000 [ 22.627071] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.635780] RSP: 0018:ffff8801b6b17948 EFLAGS: 00010246 [ 22.641204] RAX: dffffc0000000000 RBX: ffffeafff9080000 RCX: 0000000000000000 [ 22.648458] RDX: 1ffffd5fff210004 RSI: ffffffff814f5278 RDI: ffffeafff9080000 [ 22.655725] RBP: ffff8801b6b17970 R08: 00000000000342c0 R09: 0000000000000001 [ 22.663008] R10: ffff8801baff0000 R11: 0000000000000001 R12: ffff8801b6b17c08 [ 22.670259] R13: ffffeafff9080020 R14: ffffeafff9080000 R15: 0000000000000001 [ 22.677506] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 22.685707] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.691567] CR2: ffffeafff9080020 CR3: 00000001baaf9000 CR4: 00000000001606f0 [ 22.698827] Stack: [ 22.700956] ffffeafff9080020 ffff8801b6b17c08 ffff8801bdba3800 ffffeafff9080000 [ 22.708983] ffff8801bae092c0 ffff8801b6b179c8 ffffffff8154c20f ffff8801b6b17c18 [ 22.716997] ffff8801b6b17c10 ffff8801b6b17c88 00003ffe420001e0 00000001bdba3000 [ 22.725002] Call Trace: [ 22.727582] [] zap_huge_pmd+0x16f/0x860 [ 22.733196] [] unmap_page_range+0x12ad/0x1730 [ 22.739330] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 22.745627] [] unmap_single_vma+0x101/0x260 [ 22.751581] [] unmap_vmas+0x102/0x1d0 [ 22.757008] [] exit_mmap+0x214/0x3f0 [ 22.762345] [] ? SyS_munmap+0xa0/0xa0 [ 22.767777] [] ? up_write+0x1a/0x60 [ 22.773032] [] mmput+0xf3/0x2d0 [ 22.777939] [] do_exit+0x906/0x27b0 [ 22.783226] [] ? release_task.part.19+0x1210/0x1210 [ 22.789870] [] ? up_write+0x1a/0x60 [ 22.795123] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.801255] [] ? mprotect_fixup+0x930/0x930 [ 22.807212] [] do_group_exit+0x111/0x340 [ 22.812933] [] ? do_group_exit+0x340/0x340 [ 22.818795] [] SyS_exit_group+0x1d/0x20 [ 22.824410] [] do_syscall_64+0x1a6/0x490 [ 22.830102] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.837015] 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 [ 22.864223] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.870564] RSP [ 22.874166] CR2: ffffeafff9080020 [ 22.877629] ---[ end trace 9880c4f0c0ea114a ]--- [ 22.882363] Kernel panic - not syncing: Fatal exception [ 22.888053] Dumping ftrace buffer: [ 22.891585] (ftrace buffer empty) [ 22.895270] Kernel Offset: disabled [ 22.898872] Rebooting in 86400 seconds..