[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.527023] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.887899] random: sshd: uninitialized urandom read (32 bytes read) [ 15.131696] random: sshd: uninitialized urandom read (32 bytes read) [ 15.632583] random: sshd: uninitialized urandom read (32 bytes read) [ 26.305087] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 31.853412] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.940179] BUG: unable to handle kernel paging request at ffffeafff9048020 [ 31.947550] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 31.953902] PGD 0 [ 31.955859] [ 31.957482] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.961952] Dumping ftrace buffer: [ 31.965471] (ftrace buffer empty) [ 31.969163] Modules linked in: [ 31.972480] CPU: 1 PID: 3769 Comm: syz-executor719 Not tainted 4.9.122-g54068d6 #26 [ 31.980250] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.989590] task: ffff8801bc5ab000 task.stack: ffff8801bc8a0000 [ 31.995622] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 32.004313] RSP: 0018:ffff8801bc8a7948 EFLAGS: 00010246 [ 32.009736] RAX: dffffc0000000000 RBX: ffffeafff9048000 RCX: 0000000000000000 [ 32.016987] RDX: 1ffffd5fff209004 RSI: ffffffff814f5918 RDI: ffffeafff9048000 [ 32.024240] RBP: ffff8801bc8a7970 R08: 0000000000033c40 R09: 0000000000000001 [ 32.031490] R10: ffff8801bc5ab000 R11: 0000000000000001 R12: ffff8801bc8a7c08 [ 32.038739] R13: ffffeafff9048020 R14: ffffeafff9048000 R15: 0000000000000001 [ 32.046036] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.054248] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.060109] CR2: ffffeafff9048020 CR3: 00000001c3066000 CR4: 00000000001606f0 [ 32.067355] Stack: [ 32.069526] ffffeafff9048020 ffff8801bc8a7c08 ffff8801c305e800 ffffeafff9048000 [ 32.077588] ffff8801c30ad160 ffff8801bc8a79c8 ffffffff8154cb8f ffff8801bc8a7c18 [ 32.085585] ffff8801bc8a7c10 ffff8801bc8a7c88 00003ffe412001e0 00000001c305e000 [ 32.093583] Call Trace: [ 32.096188] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 32.101801] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 32.107933] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 32.114326] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 32.120285] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 32.125769] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 32.131113] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 32.136544] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 32.141800] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 32.146971] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 32.152231] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 32.158886] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 32.164148] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 32.170270] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 32.176226] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 32.181973] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 32.187839] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 32.193447] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 32.199137] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.206037] 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 [ 32.233186] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 32.239521] RSP <ffff8801bc8a7948> [ 32.243120] CR2: ffffeafff9048020 [ 32.246551] ---[ end trace 270e20156db94d9d ]--- [ 32.251290] Kernel panic - not syncing: Fatal exception [ 32.256911] Dumping ftrace buffer: [ 32.260434] (ftrace buffer empty) [ 32.264132] Kernel Offset: disabled [ 32.267924] Rebooting in 86400 seconds..