[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.242860] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.377217] random: sshd: uninitialized urandom read (32 bytes read) [ 22.734612] random: sshd: uninitialized urandom read (32 bytes read) [ 23.094008] random: sshd: uninitialized urandom read (32 bytes read) [ 34.696944] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 40.324902] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.437932] BUG: unable to handle kernel paging request at ffffeafff8ed8020 [ 40.445309] IP: [] page_remove_rmap+0x37/0x6d0 [ 40.451540] PGD 0 [ 40.453490] [ 40.455133] Oops: 0000 [#1] PREEMPT SMP KASAN [ 40.459596] Dumping ftrace buffer: [ 40.463103] (ftrace buffer empty) [ 40.466784] Modules linked in: [ 40.470111] CPU: 1 PID: 3705 Comm: syz-executor027 Not tainted 4.9.122-g54068d6 #26 [ 40.477868] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.487190] task: ffff8801c1f1e000 task.stack: ffff8801c0ca8000 [ 40.493215] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 40.501895] RSP: 0018:ffff8801c0caf948 EFLAGS: 00010246 [ 40.507306] RAX: dffffc0000000000 RBX: ffffeafff8ed8000 RCX: 0000000000000000 [ 40.514543] RDX: 1ffffd5fff1db004 RSI: ffffffff814f5918 RDI: ffffeafff8ed8000 [ 40.521779] RBP: ffff8801c0caf970 R08: 0000000000033aa0 R09: 0000000000000001 [ 40.529013] R10: ffff8801c1f1e000 R11: 0000000000000001 R12: ffff8801c0cafc08 [ 40.536252] R13: ffffeafff8ed8020 R14: ffffeafff8ed8000 R15: 0000000000000001 [ 40.543503] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.551699] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.557548] CR2: ffffeafff8ed8020 CR3: 00000001c9674000 CR4: 00000000001606f0 [ 40.564887] Stack: [ 40.567122] ffffeafff8ed8020 ffff8801c0cafc08 ffff8801c5d7f800 ffffeafff8ed8000 [ 40.575100] ffff8801c36a23c8 ffff8801c0caf9c8 ffffffff8154cb8f ffff8801c0cafc18 [ 40.583056] ffff8801c0cafc10 ffff8801c0cafc88 00003ffe3b6001e0 00000001c5d7f000 [ 40.591011] Call Trace: [ 40.593569] [] zap_huge_pmd+0x16f/0x860 [ 40.599191] [] unmap_page_range+0x12ad/0x1730 [ 40.605303] [] ? vm_normal_page_pmd+0x310/0x310 [ 40.611591] [] unmap_single_vma+0x101/0x260 [ 40.617530] [] unmap_vmas+0x102/0x1d0 [ 40.622946] [] exit_mmap+0x214/0x3f0 [ 40.628285] [] ? SyS_munmap+0xa0/0xa0 [ 40.633706] [] ? up_write+0x1a/0x60 [ 40.638973] [] mmput+0xf3/0x2d0 [ 40.643872] [] do_exit+0x906/0x27b0 [ 40.649115] [] ? release_task.part.19+0x1210/0x1210 [ 40.655751] [] ? up_write+0x1a/0x60 [ 40.661007] [] ? do_mprotect_pkey+0x71d/0x890 [ 40.667118] [] ? mprotect_fixup+0x930/0x930 [ 40.673161] [] do_group_exit+0x111/0x340 [ 40.678846] [] ? do_group_exit+0x340/0x340 [ 40.684718] [] SyS_exit_group+0x1d/0x20 [ 40.690315] [] do_syscall_64+0x1a6/0x490 [ 40.696058] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 40.702955] 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 [ 40.729610] RIP [] page_remove_rmap+0x37/0x6d0 [ 40.735941] RSP [ 40.739549] CR2: ffffeafff8ed8020 [ 40.742975] ---[ end trace 5fef2559c2d41b3f ]--- [ 40.747699] Kernel panic - not syncing: Fatal exception [ 40.753316] Dumping ftrace buffer: [ 40.756827] (ftrace buffer empty) [ 40.760515] Kernel Offset: disabled [ 40.764126] Rebooting in 86400 seconds..