[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.981934] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 15.047232] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 15.379973] random: sshd: uninitialized urandom read (32 bytes read) [ 15.847785] random: sshd: uninitialized urandom read (32 bytes read) [ 22.198984] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. [ 28.009946] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.109279] BUG: unable to handle kernel paging request at ffffeafff9190020 [ 28.116733] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.123003] PGD 0 [ 28.124953] [ 28.126576] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.131050] Dumping ftrace buffer: [ 28.134565] (ftrace buffer empty) [ 28.138249] Modules linked in: [ 28.141539] CPU: 1 PID: 3804 Comm: syz-executor752 Not tainted 4.9.121-g681e57b #25 [ 28.149460] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.158797] task: ffff8801b700e000 task.stack: ffff8801d9518000 [ 28.164837] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.173516] RSP: 0018:ffff8801d951f948 EFLAGS: 00010246 [ 28.178939] RAX: dffffc0000000000 RBX: ffffeafff9190000 RCX: 0000000000000000 [ 28.186185] RDX: 1ffffd5fff232004 RSI: ffffffff814f5278 RDI: ffffeafff9190000 [ 28.193521] RBP: ffff8801d951f970 R08: 0000000000033ac0 R09: 0000000000000001 [ 28.200784] R10: ffff8801b700e000 R11: 0000000000000001 R12: ffff8801d951fc08 [ 28.208146] R13: ffffeafff9190020 R14: ffffeafff9190000 R15: 0000000000000001 [ 28.215401] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.223606] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.229464] CR2: ffffeafff9190020 CR3: 00000001c73b0000 CR4: 00000000001606f0 [ 28.236773] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.244148] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.251469] Stack: [ 28.253607] ffffeafff9190020 ffff8801d951fc08 ffff8801c73a8800 ffffeafff9190000 [ 28.261857] ffff8801b589f790 ffff8801d951f9c8 ffffffff8154c20f ffff8801d951fc18 [ 28.269957] ffff8801d951fc10 ffff8801d951fc88 00003ffe464001e0 00000001c73a8000 [ 28.278001] Call Trace: [ 28.280575] [] zap_huge_pmd+0x16f/0x860 [ 28.286260] [] unmap_page_range+0x12ad/0x1730 [ 28.292396] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 28.298696] [] unmap_single_vma+0x101/0x260 [ 28.304651] [] unmap_vmas+0x102/0x1d0 [ 28.310085] [] exit_mmap+0x214/0x3f0 [ 28.315422] [] ? SyS_munmap+0xa0/0xa0 [ 28.320988] [] ? up_write+0x1a/0x60 [ 28.326254] [] mmput+0xf3/0x2d0 [ 28.331172] [] do_exit+0x906/0x27b0 [ 28.336734] [] ? release_task.part.19+0x1210/0x1210 [ 28.343501] [] ? up_write+0x1a/0x60 [ 28.348755] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.354878] [] ? mprotect_fixup+0x930/0x930 [ 28.360832] [] ? SyS_pwrite64+0xe8/0x170 [ 28.366527] [] do_group_exit+0x111/0x340 [ 28.372288] [] ? do_group_exit+0x340/0x340 [ 28.378154] [] SyS_exit_group+0x1d/0x20 [ 28.383760] [] do_syscall_64+0x1a6/0x490 [ 28.389454] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.396351] 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 [ 28.423958] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.430295] RSP [ 28.433935] CR2: ffffeafff9190020 [ 28.437420] ---[ end trace 6e0d7258cac82016 ]--- [ 28.442154] Kernel panic - not syncing: Fatal exception [ 28.447883] Dumping ftrace buffer: [ 28.451397] (ftrace buffer empty) [ 28.455256] Kernel Offset: disabled [ 28.458859] Rebooting in 86400 seconds..