[....] 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[ 13.905355] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.780078] random: sshd: uninitialized urandom read (32 bytes read) [ 26.067318] random: sshd: uninitialized urandom read (32 bytes read) [ 26.515968] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.45' (ECDSA) to the list of known hosts. [ 32.231933] urandom_read: 1 callbacks suppressed [ 32.231936] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.323216] BUG: unable to handle kernel paging request at ffffeafff8dd8020 [ 32.330574] IP: [] page_remove_rmap+0x37/0x6d0 [ 32.336828] PGD 0 [ 32.338775] [ 32.340397] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.344929] Dumping ftrace buffer: [ 32.348453] (ftrace buffer empty) [ 32.352139] Modules linked in: [ 32.355427] CPU: 0 PID: 3802 Comm: syz-executor809 Not tainted 4.9.121-g681e57b #77 [ 32.363198] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.372537] task: ffff8801b7894800 task.stack: ffff8801d9490000 [ 32.378569] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 32.387249] RSP: 0018:ffff8801d9497948 EFLAGS: 00010246 [ 32.392673] RAX: dffffc0000000000 RBX: ffffeafff8dd8000 RCX: 0000000000000000 [ 32.399968] RDX: 1ffffd5fff1bb004 RSI: ffffffff814f5278 RDI: ffffeafff8dd8000 [ 32.407269] RBP: ffff8801d9497970 R08: 0000000000033f20 R09: 0000000000000001 [ 32.414521] R10: ffff8801b7894800 R11: 0000000000000001 R12: ffff8801d9497c08 [ 32.421837] R13: ffffeafff8dd8020 R14: ffffeafff8dd8000 R15: 0000000000000001 [ 32.429094] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.437335] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.443195] CR2: ffffeafff8dd8020 CR3: 00000001c9430000 CR4: 00000000001606f0 [ 32.450441] Stack: [ 32.452566] ffffeafff8dd8020 ffff8801d9497c08 ffff8801c97b8800 ffffeafff8dd8000 [ 32.460607] ffff8801cb7438f0 ffff8801d94979c8 ffffffff8154c20f ffff8801d9497c18 [ 32.468647] ffff8801d9497c10 ffff8801d9497c88 00003ffe376001e0 00000001c97b8000 [ 32.476639] Call Trace: [ 32.479208] [] zap_huge_pmd+0x16f/0x860 [ 32.484810] [] unmap_page_range+0x12ad/0x1730 [ 32.490931] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 32.497228] [] unmap_single_vma+0x101/0x260 [ 32.503184] [] unmap_vmas+0x102/0x1d0 [ 32.508616] [] exit_mmap+0x214/0x3f0 [ 32.513954] [] ? SyS_munmap+0xa0/0xa0 [ 32.519383] [] ? up_write+0x1a/0x60 [ 32.524644] [] mmput+0xf3/0x2d0 [ 32.529554] [] do_exit+0x906/0x27b0 [ 32.534816] [] ? release_task.part.19+0x1210/0x1210 [ 32.541458] [] ? up_write+0x1a/0x60 [ 32.546717] [] ? do_mprotect_pkey+0x71d/0x890 [ 32.552938] [] ? mprotect_fixup+0x930/0x930 [ 32.558899] [] do_group_exit+0x111/0x340 [ 32.564586] [] ? do_group_exit+0x340/0x340 [ 32.570444] [] SyS_exit_group+0x1d/0x20 [ 32.576042] [] do_syscall_64+0x1a6/0x490 [ 32.581731] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.588631] 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 [ 32.615552] RIP [] page_remove_rmap+0x37/0x6d0 [ 32.621887] RSP [ 32.625486] CR2: ffffeafff8dd8020 [ 32.628917] ---[ end trace 48c490f3489d8d7f ]--- [ 32.633645] Kernel panic - not syncing: Fatal exception [ 32.639272] Dumping ftrace buffer: [ 32.642790] (ftrace buffer empty) [ 32.646478] Kernel Offset: disabled [ 32.650132] Rebooting in 86400 seconds..