[....] 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[ 14.398291] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.847652] random: sshd: uninitialized urandom read (32 bytes read) [ 21.100058] random: sshd: uninitialized urandom read (32 bytes read) [ 21.614871] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 27.411356] urandom_read: 1 callbacks suppressed [ 27.411359] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.492903] BUG: unable to handle kernel paging request at ffffeafff8e20020 [ 27.500280] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.506646] PGD 0 [ 27.508594] [ 27.510214] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.514695] Dumping ftrace buffer: [ 27.518231] (ftrace buffer empty) [ 27.521934] Modules linked in: [ 27.525338] CPU: 0 PID: 3655 Comm: syz-executor133 Not tainted 4.9.122-g54068d6 #78 [ 27.533170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.542623] task: ffff8801c52b1800 task.stack: ffff8801c40d0000 [ 27.548659] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.557420] RSP: 0018:ffff8801c40d7948 EFLAGS: 00010246 [ 27.562931] RAX: dffffc0000000000 RBX: ffffeafff8e20000 RCX: 0000000000000000 [ 27.570181] RDX: 1ffffd5fff1c4004 RSI: ffffffff814f5918 RDI: ffffeafff8e20000 [ 27.577428] RBP: ffff8801c40d7970 R08: 0000000000034580 R09: 0000000000000001 [ 27.584676] R10: ffff8801c52b1800 R11: 0000000000000001 R12: ffff8801c40d7c08 [ 27.592018] R13: ffffeafff8e20020 R14: ffffeafff8e20000 R15: 0000000000000001 [ 27.599268] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.607471] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.613330] CR2: ffffeafff8e20020 CR3: 00000001c5355000 CR4: 00000000001606f0 [ 27.620579] Stack: [ 27.622716] ffffeafff8e20020 ffff8801c40d7c08 ffff8801c94ff800 ffffeafff8e20000 [ 27.630771] ffff8801c7a27b00 ffff8801c40d79c8 ffffffff8154cb8f ffff8801c40d7c18 [ 27.638764] ffff8801c40d7c10 ffff8801c40d7c88 00003ffe388001e0 00000001c94ff000 [ 27.646756] Call Trace: [ 27.649371] [] zap_huge_pmd+0x16f/0x860 [ 27.654978] [] unmap_page_range+0x12ad/0x1730 [ 27.661149] [] ? vm_normal_page_pmd+0x310/0x310 [ 27.667451] [] unmap_single_vma+0x101/0x260 [ 27.673502] [] unmap_vmas+0x102/0x1d0 [ 27.678975] [] exit_mmap+0x214/0x3f0 [ 27.684431] [] ? SyS_munmap+0xa0/0xa0 [ 27.689864] [] ? up_write+0x1a/0x60 [ 27.695118] [] mmput+0xf3/0x2d0 [ 27.700027] [] do_exit+0x906/0x27b0 [ 27.705283] [] ? release_task.part.19+0x1210/0x1210 [ 27.711925] [] ? up_write+0x1a/0x60 [ 27.717180] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.723303] [] ? mprotect_fixup+0x930/0x930 [ 27.729253] [] do_group_exit+0x111/0x340 [ 27.734943] [] ? do_group_exit+0x340/0x340 [ 27.740810] [] SyS_exit_group+0x1d/0x20 [ 27.746476] [] do_syscall_64+0x1a6/0x490 [ 27.752170] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.759068] 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 [ 27.786184] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.792591] RSP [ 27.796277] CR2: ffffeafff8e20020 [ 27.799723] ---[ end trace 3c658832b4447a71 ]--- [ 27.804462] Kernel panic - not syncing: Fatal exception [ 27.810127] Dumping ftrace buffer: [ 27.813651] (ftrace buffer empty) [ 27.817403] Kernel Offset: disabled [ 27.821022] Rebooting in 86400 seconds..