[....] 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[ 15.103807] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.640078] random: sshd: uninitialized urandom read (32 bytes read) [ 19.825094] random: sshd: uninitialized urandom read (32 bytes read) [ 20.323470] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 25.979927] urandom_read: 1 callbacks suppressed [ 25.979930] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.111120] BUG: unable to handle kernel paging request at ffffeafff9090020 [ 26.118485] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.124742] PGD 0 [ 26.126696] [ 26.128487] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.132966] Dumping ftrace buffer: [ 26.136478] (ftrace buffer empty) [ 26.140165] Modules linked in: [ 26.143465] CPU: 1 PID: 3788 Comm: syz-executor111 Not tainted 4.9.122-g54068d6 #78 [ 26.151239] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.160576] task: ffff8801bb5b6000 task.stack: ffff8801b90c0000 [ 26.166610] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.175291] RSP: 0018:ffff8801b90c7948 EFLAGS: 00010246 [ 26.180714] RAX: dffffc0000000000 RBX: ffffeafff9090000 RCX: 0000000000000000 [ 26.187962] RDX: 1ffffd5fff212004 RSI: ffffffff814f5918 RDI: ffffeafff9090000 [ 26.195211] RBP: ffff8801b90c7970 R08: 00000000000349e0 R09: 0000000000000001 [ 26.202460] R10: ffff8801bb5b6000 R11: 0000000000000001 R12: ffff8801b90c7c08 [ 26.209709] R13: ffffeafff9090020 R14: ffffeafff9090000 R15: 0000000000000001 [ 26.216976] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.225182] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.231044] CR2: ffffeafff9090020 CR3: 00000001c1a87000 CR4: 00000000001606f0 [ 26.238303] Stack: [ 26.240444] ffffeafff9090020 ffff8801b90c7c08 ffff8801bfb42800 ffffeafff9090000 [ 26.248579] ffff8801bb7e8948 ffff8801b90c79c8 ffffffff8154cb8f ffff8801b90c7c18 [ 26.256579] ffff8801b90c7c10 ffff8801b90c7c88 00003ffe424001e0 00000001bfb42000 [ 26.264585] Call Trace: [ 26.267157] [] zap_huge_pmd+0x16f/0x860 [ 26.272770] [] unmap_page_range+0x12ad/0x1730 [ 26.278906] [] ? vm_normal_page_pmd+0x310/0x310 [ 26.285214] [] unmap_single_vma+0x101/0x260 [ 26.291171] [] unmap_vmas+0x102/0x1d0 [ 26.296607] [] exit_mmap+0x214/0x3f0 [ 26.302064] [] ? SyS_munmap+0xa0/0xa0 [ 26.307504] [] ? up_write+0x1a/0x60 [ 26.312775] [] mmput+0xf3/0x2d0 [ 26.317716] [] do_exit+0x906/0x27b0 [ 26.322975] [] ? release_task.part.19+0x1210/0x1210 [ 26.329620] [] ? retint_kernel+0x2d/0x2d [ 26.335306] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 26.342128] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.348790] [] ? check_preemption_disabled+0x3b/0x170 [ 26.355607] [] ? retint_kernel+0x2d/0x2d [ 26.361301] [] do_group_exit+0x111/0x340 [ 26.367010] [] ? do_group_exit+0x340/0x340 [ 26.372876] [] SyS_exit_group+0x1d/0x20 [ 26.378477] [] do_syscall_64+0x1a6/0x490 [ 26.384164] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.391062] 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 [ 26.418635] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.425016] RSP [ 26.428625] CR2: ffffeafff9090020 [ 26.432059] ---[ end trace e0e6b3252aac805c ]--- [ 26.436789] Kernel panic - not syncing: Fatal exception [ 26.442466] Dumping ftrace buffer: [ 26.445985] (ftrace buffer empty) [ 26.449672] Kernel Offset: disabled [ 26.453277] Rebooting in 86400 seconds..