[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.822840] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.830888] random: sshd: uninitialized urandom read (32 bytes read) [ 18.273265] random: sshd: uninitialized urandom read (32 bytes read) [ 18.795176] random: sshd: uninitialized urandom read (32 bytes read) [ 21.820788] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 27.356803] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.443222] BUG: unable to handle kernel paging request at ffffeafff91a8020 [ 27.450696] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.456940] PGD 0 [ 27.458883] [ 27.460503] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.464973] Dumping ftrace buffer: [ 27.468483] (ftrace buffer empty) [ 27.472226] Modules linked in: [ 27.475516] CPU: 0 PID: 3800 Comm: syz-executor098 Not tainted 4.9.121-g681e57b #25 [ 27.483389] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.492720] task: ffff8801b7d09800 task.stack: ffff8801b6360000 [ 27.498749] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.507434] RSP: 0018:ffff8801b6367948 EFLAGS: 00010246 [ 27.512856] RAX: dffffc0000000000 RBX: ffffeafff91a8000 RCX: 0000000000000000 [ 27.520102] RDX: 1ffffd5fff235004 RSI: ffffffff814f5278 RDI: ffffeafff91a8000 [ 27.527344] RBP: ffff8801b6367970 R08: 0000000000034920 R09: 0000000000000001 [ 27.534594] R10: ffff8801b7d09800 R11: 0000000000000001 R12: ffff8801b6367c08 [ 27.541842] R13: ffffeafff91a8020 R14: ffffeafff91a8000 R15: 0000000000000001 [ 27.549087] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.557296] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.563153] CR2: ffffeafff91a8020 CR3: 00000001bc2d9000 CR4: 00000000001606f0 [ 27.570399] Stack: [ 27.572522] ffffeafff91a8020 ffff8801b6367c08 ffff8801c96fc800 ffffeafff91a8000 [ 27.580499] ffff8801b7ad9898 ffff8801b63679c8 ffffffff8154c20f ffff8801b6367c18 [ 27.588492] ffff8801b6367c10 ffff8801b6367c88 00003ffe46a001e0 00000001c96fc000 [ 27.596558] Call Trace: [ 27.599122] [] zap_huge_pmd+0x16f/0x860 [ 27.604735] [] unmap_page_range+0x12ad/0x1730 [ 27.610858] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.617155] [] unmap_single_vma+0x101/0x260 [ 27.623126] [] unmap_vmas+0x102/0x1d0 [ 27.628559] [] exit_mmap+0x214/0x3f0 [ 27.634004] [] ? SyS_munmap+0xa0/0xa0 [ 27.639428] [] ? up_write+0x1a/0x60 [ 27.644681] [] mmput+0xf3/0x2d0 [ 27.649586] [] do_exit+0x906/0x27b0 [ 27.654838] [] ? release_task.part.19+0x1210/0x1210 [ 27.661585] [] ? up_write+0x1a/0x60 [ 27.666840] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.672962] [] ? mprotect_fixup+0x930/0x930 [ 27.678908] [] do_group_exit+0x111/0x340 [ 27.684591] [] ? do_group_exit+0x340/0x340 [ 27.690447] [] SyS_exit_group+0x1d/0x20 [ 27.696057] [] do_syscall_64+0x1a6/0x490 [ 27.701756] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.708662] 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 [ 27.735527] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.741852] RSP [ 27.745460] CR2: ffffeafff91a8020 [ 27.748885] ---[ end trace 14df9f0d6615cb68 ]--- [ 27.753628] Kernel panic - not syncing: Fatal exception [ 27.759262] Dumping ftrace buffer: [ 27.762781] (ftrace buffer empty) [ 27.766462] Kernel Offset: disabled [ 27.770060] Rebooting in 86400 seconds..