[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.762629] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 16.325697] random: sshd: uninitialized urandom read (32 bytes read) [ 16.641570] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.181880] random: sshd: uninitialized urandom read (32 bytes read) [ 17.323304] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.55' (ECDSA) to the list of known hosts. [ 23.008186] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.089499] BUG: unable to handle kernel paging request at ffffeafff90e8020 [ 23.096850] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.103125] PGD 0 [ 23.105070] [ 23.106687] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.111154] Dumping ftrace buffer: [ 23.114667] (ftrace buffer empty) [ 23.118349] Modules linked in: [ 23.121648] CPU: 0 PID: 3789 Comm: syz-executor588 Not tainted 4.9.122-g54068d6 #78 [ 23.129410] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.138737] task: ffff8801b7209800 task.stack: ffff8801b6db0000 [ 23.144763] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.153435] RSP: 0018:ffff8801b6db7948 EFLAGS: 00010246 [ 23.158854] RAX: dffffc0000000000 RBX: ffffeafff90e8000 RCX: 0000000000000000 [ 23.166094] RDX: 1ffffd5fff21d004 RSI: ffffffff814f5918 RDI: ffffeafff90e8000 [ 23.173336] RBP: ffff8801b6db7970 R08: 0000000000034080 R09: 0000000000000001 [ 23.180579] R10: ffff8801b7209800 R11: 0000000000000001 R12: ffff8801b6db7c08 [ 23.187831] R13: ffffeafff90e8020 R14: ffffeafff90e8000 R15: 0000000000000001 [ 23.195075] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.203274] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.209300] CR2: ffffeafff90e8020 CR3: 00000001b8b37000 CR4: 00000000001606f0 [ 23.216543] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.223785] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.231024] Stack: [ 23.233150] ffffeafff90e8020 ffff8801b6db7c08 ffff8801b8da2800 ffffeafff90e8000 [ 23.241147] ffff8801c7c15318 ffff8801b6db79c8 ffffffff8154cb8f ffff8801b6db7c18 [ 23.249136] ffff8801b6db7c10 ffff8801b6db7c88 00003ffe43a001e0 00000001b8da2000 [ 23.257127] Call Trace: [ 23.259691] [] zap_huge_pmd+0x16f/0x860 [ 23.265294] [] unmap_page_range+0x12ad/0x1730 [ 23.271441] [] ? vm_normal_page_pmd+0x310/0x310 [ 23.277733] [] unmap_single_vma+0x101/0x260 [ 23.283680] [] unmap_vmas+0x102/0x1d0 [ 23.289102] [] exit_mmap+0x214/0x3f0 [ 23.294438] [] ? SyS_munmap+0xa0/0xa0 [ 23.299865] [] ? up_write+0x1a/0x60 [ 23.305114] [] mmput+0xf3/0x2d0 [ 23.310016] [] do_exit+0x906/0x27b0 [ 23.315263] [] ? release_task.part.19+0x1210/0x1210 [ 23.321899] [] ? up_write+0x1a/0x60 [ 23.327190] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.333330] [] ? mprotect_fixup+0x930/0x930 [ 23.339273] [] do_group_exit+0x111/0x340 [ 23.344957] [] ? do_group_exit+0x340/0x340 [ 23.350836] [] SyS_exit_group+0x1d/0x20 [ 23.356449] [] do_syscall_64+0x1a6/0x490 [ 23.362140] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.369060] 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 [ 23.396066] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.402391] RSP [ 23.405987] CR2: ffffeafff90e8020 [ 23.409435] ---[ end trace 1e0c2332e30898b5 ]--- [ 23.414162] Kernel panic - not syncing: Fatal exception [ 23.419901] Dumping ftrace buffer: [ 23.423415] (ftrace buffer empty) [ 23.427099] Kernel Offset: disabled [ 23.430696] Rebooting in 86400 seconds..