[....] 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[ 15.624687] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.190536] random: sshd: uninitialized urandom read (32 bytes read) [ 17.484980] random: sshd: uninitialized urandom read (32 bytes read) [ 18.000449] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.63' (ECDSA) to the list of known hosts. [ 23.852421] urandom_read: 1 callbacks suppressed [ 23.852424] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.944375] BUG: unable to handle kernel paging request at ffffeafff90c0020 [ 23.951724] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.957969] PGD 0 [ 23.959917] [ 23.961538] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.966007] Dumping ftrace buffer: [ 23.969521] (ftrace buffer empty) [ 23.973207] Modules linked in: [ 23.976494] CPU: 1 PID: 3791 Comm: syz-executor946 Not tainted 4.9.122-g54068d6 #78 [ 23.984259] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.993588] task: ffff8801b5c29800 task.stack: ffff8801b5f98000 [ 23.999620] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.008307] RSP: 0018:ffff8801b5f9f948 EFLAGS: 00010246 [ 24.013739] RAX: dffffc0000000000 RBX: ffffeafff90c0000 RCX: 0000000000000000 [ 24.020995] RDX: 1ffffd5fff218004 RSI: ffffffff814f5918 RDI: ffffeafff90c0000 [ 24.028241] RBP: ffff8801b5f9f970 R08: 0000000000033f60 R09: 0000000000000001 [ 24.035492] R10: ffff8801b5c29800 R11: 0000000000000001 R12: ffff8801b5f9fc08 [ 24.042738] R13: ffffeafff90c0020 R14: ffffeafff90c0000 R15: 0000000000000001 [ 24.049986] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 24.058190] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.064046] CR2: ffffeafff90c0020 CR3: 00000001c63ec000 CR4: 00000000001606f0 [ 24.071319] Stack: [ 24.073444] ffffeafff90c0020 ffff8801b5f9fc08 ffff8801c9da0800 ffffeafff90c0000 [ 24.081531] ffff8801c3cb49a0 ffff8801b5f9f9c8 ffffffff8154cb8f ffff8801b5f9fc18 [ 24.089517] ffff8801b5f9fc10 ffff8801b5f9fc88 00003ffe430001e0 00000001c9da0000 [ 24.097508] Call Trace: [ 24.100081] [] zap_huge_pmd+0x16f/0x860 [ 24.105694] [] unmap_page_range+0x12ad/0x1730 [ 24.111833] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.118151] [] unmap_single_vma+0x101/0x260 [ 24.124099] [] unmap_vmas+0x102/0x1d0 [ 24.129538] [] exit_mmap+0x214/0x3f0 [ 24.134883] [] ? SyS_munmap+0xa0/0xa0 [ 24.140311] [] ? up_write+0x1a/0x60 [ 24.145566] [] mmput+0xf3/0x2d0 [ 24.150480] [] do_exit+0x906/0x27b0 [ 24.155745] [] ? release_task.part.19+0x1210/0x1210 [ 24.162400] [] ? up_write+0x1a/0x60 [ 24.167653] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.173784] [] ? mprotect_fixup+0x930/0x930 [ 24.179739] [] do_group_exit+0x111/0x340 [ 24.185430] [] ? do_group_exit+0x340/0x340 [ 24.191290] [] SyS_exit_group+0x1d/0x20 [ 24.196895] [] do_syscall_64+0x1a6/0x490 [ 24.202593] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.209496] 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 [ 24.236363] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.242708] RSP [ 24.246309] CR2: ffffeafff90c0020 [ 24.249740] ---[ end trace 2abc4c9b47ece3d8 ]--- [ 24.254470] Kernel panic - not syncing: Fatal exception [ 24.260131] Dumping ftrace buffer: [ 24.263656] (ftrace buffer empty) [ 24.267342] Kernel Offset: disabled [ 24.270946] Rebooting in 86400 seconds..