[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.032122] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.520836] random: sshd: uninitialized urandom read (32 bytes read) [ 26.946090] random: sshd: uninitialized urandom read (32 bytes read) [ 27.311715] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.201' (ECDSA) to the list of known hosts. [ 32.910087] urandom_read: 1 callbacks suppressed [ 32.910091] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.999729] BUG: unable to handle kernel paging request at ffffeafff9158020 [ 33.007209] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.013582] PGD 0 [ 33.015530] [ 33.017154] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.021630] Dumping ftrace buffer: [ 33.025156] (ftrace buffer empty) [ 33.028850] Modules linked in: [ 33.032141] CPU: 0 PID: 3801 Comm: syz-executor532 Not tainted 4.9.121-g681e57b #25 [ 33.039905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.049257] task: ffff8801b8ab9800 task.stack: ffff8801b6508000 [ 33.055305] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.064087] RSP: 0018:ffff8801b650f948 EFLAGS: 00010246 [ 33.069514] RAX: dffffc0000000000 RBX: ffffeafff9158000 RCX: ffffea0006ea0000 [ 33.076762] RDX: 1ffffd5fff22b004 RSI: ffffffff814f5278 RDI: ffffeafff9158000 [ 33.084007] RBP: ffff8801b650f970 R08: 00000000000342c0 R09: 0000000000000001 [ 33.091259] R10: ffff8801b8ab9800 R11: 0000000000000001 R12: ffff8801b650fc08 [ 33.098508] R13: ffffeafff9158020 R14: ffffeafff9158000 R15: 0000000000000001 [ 33.105889] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.114089] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.119942] CR2: ffffeafff9158020 CR3: 00000001b9cd7000 CR4: 00000000001606f0 [ 33.127198] Stack: [ 33.129336] ffffeafff9158020 ffff8801b650fc08 ffff8801b8c57810 ffffeafff9158000 [ 33.137440] ffff8801b8b901b8 ffff8801b650f9c8 ffffffff8154c20f ffff8801b650fc18 [ 33.145583] ffff8801b650fc10 ffff8801b650fc88 00003ffe456001a0 00000001b8c57000 [ 33.153589] Call Trace: [ 33.156156] [] zap_huge_pmd+0x16f/0x860 [ 33.161767] [] unmap_page_range+0x12ad/0x1730 [ 33.167899] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 33.174286] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 33.181211] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.188039] [] unmap_single_vma+0x101/0x260 [ 33.193999] [] unmap_vmas+0x102/0x1d0 [ 33.199434] [] exit_mmap+0x214/0x3f0 [ 33.204780] [] ? SyS_munmap+0xa0/0xa0 [ 33.210209] [] ? up_write+0x1a/0x60 [ 33.215466] [] mmput+0xf3/0x2d0 [ 33.220379] [] do_exit+0x906/0x27b0 [ 33.225640] [] ? release_task.part.19+0x1210/0x1210 [ 33.232284] [] ? up_write+0x1a/0x60 [ 33.237541] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.243663] [] ? mprotect_fixup+0x930/0x930 [ 33.249617] [] do_group_exit+0x111/0x340 [ 33.255311] [] ? do_group_exit+0x340/0x340 [ 33.261176] [] SyS_exit_group+0x1d/0x20 [ 33.266778] [] do_syscall_64+0x1a6/0x490 [ 33.272476] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.279383] 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 [ 33.306488] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.312829] RSP [ 33.316428] CR2: ffffeafff9158020 [ 33.319858] ---[ end trace c5988251a8a32392 ]--- [ 33.324630] Kernel panic - not syncing: Fatal exception [ 33.330057] Dumping ftrace buffer: [ 33.333570] (ftrace buffer empty) [ 33.337277] Kernel Offset: disabled [ 33.340908] Rebooting in 86400 seconds..