[....] 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[ 13.742468] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.491236] random: sshd: uninitialized urandom read (32 bytes read) [ 17.747510] random: sshd: uninitialized urandom read (32 bytes read) [ 18.264825] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. [ 23.876782] urandom_read: 1 callbacks suppressed [ 23.876787] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.967677] BUG: unable to handle kernel paging request at ffffeafff9190020 [ 23.975078] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.981349] PGD 0 [ 23.983308] [ 23.985055] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.989545] Dumping ftrace buffer: [ 23.993191] (ftrace buffer empty) [ 23.996891] Modules linked in: [ 24.000208] CPU: 1 PID: 3802 Comm: syz-executor626 Not tainted 4.9.121-g681e57b #25 [ 24.008136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.017631] task: ffff8801b7919800 task.stack: ffff8801b6ba0000 [ 24.023677] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.032379] RSP: 0018:ffff8801b6ba7948 EFLAGS: 00010246 [ 24.037816] RAX: dffffc0000000000 RBX: ffffeafff9190000 RCX: 0000000000000000 [ 24.045137] RDX: 1ffffd5fff232004 RSI: ffffffff814f5278 RDI: ffffeafff9190000 [ 24.052613] RBP: ffff8801b6ba7970 R08: 0000000000034340 R09: 0000000000000001 [ 24.060000] R10: ffff8801b7919800 R11: 0000000000000001 R12: ffff8801b6ba7c08 [ 24.067261] R13: ffffeafff9190020 R14: ffffeafff9190000 R15: 0000000000000001 [ 24.074522] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 24.082827] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.088699] CR2: ffffeafff9190020 CR3: 00000001c8ee6000 CR4: 00000000001606f0 [ 24.095957] Stack: [ 24.098095] ffffeafff9190020 ffff8801b6ba7c08 ffff8801bba05800 ffffeafff9190000 [ 24.106163] ffff8801b72467e8 ffff8801b6ba79c8 ffffffff8154c20f ffff8801b6ba7c18 [ 24.114211] ffff8801b6ba7c10 ffff8801b6ba7c88 00003ffe464001e0 00000001bba05000 [ 24.122288] Call Trace: [ 24.124871] [] zap_huge_pmd+0x16f/0x860 [ 24.130483] [] unmap_page_range+0x12ad/0x1730 [ 24.136614] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 24.142919] [] unmap_single_vma+0x101/0x260 [ 24.148878] [] unmap_vmas+0x102/0x1d0 [ 24.154315] [] exit_mmap+0x214/0x3f0 [ 24.159677] [] ? SyS_munmap+0xa0/0xa0 [ 24.165115] [] ? up_write+0x1a/0x60 [ 24.170380] [] mmput+0xf3/0x2d0 [ 24.175299] [] do_exit+0x906/0x27b0 [ 24.180641] [] ? release_task.part.19+0x1210/0x1210 [ 24.187301] [] ? up_write+0x1a/0x60 [ 24.192564] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.198707] [] ? mprotect_fixup+0x930/0x930 [ 24.204667] [] do_group_exit+0x111/0x340 [ 24.210498] [] ? do_group_exit+0x340/0x340 [ 24.216374] [] SyS_exit_group+0x1d/0x20 [ 24.221989] [] do_syscall_64+0x1a6/0x490 [ 24.227828] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.234740] 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 [ 24.262841] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.269200] RSP [ 24.272974] CR2: ffffeafff9190020 [ 24.276415] ---[ end trace 67b7f67e3b8e822d ]--- [ 24.281244] Kernel panic - not syncing: Fatal exception [ 24.287206] Dumping ftrace buffer: [ 24.290744] (ftrace buffer empty) [ 24.294442] Kernel Offset: disabled [ 24.298205] Rebooting in 86400 seconds..