[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.439308] 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: [ 17.761135] random: sshd: uninitialized urandom read (32 bytes read) [ 17.930759] random: sshd: uninitialized urandom read (32 bytes read) [ 18.443011] random: sshd: uninitialized urandom read (32 bytes read) [ 30.302248] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.29' (ECDSA) to the list of known hosts. [ 35.930752] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.024847] BUG: unable to handle kernel paging request at ffffeafff8fe0020 [ 36.032229] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 36.038501] PGD 0 [ 36.040448] [ 36.042076] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.046554] Dumping ftrace buffer: [ 36.050107] (ftrace buffer empty) [ 36.053811] Modules linked in: [ 36.057103] CPU: 0 PID: 3761 Comm: syz-executor664 Not tainted 4.9.122-g54068d6 #26 [ 36.064869] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.074201] task: ffff8801bc108000 task.stack: ffff8801bc5a0000 [ 36.080243] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 36.088924] RSP: 0018:ffff8801bc5a7948 EFLAGS: 00010246 [ 36.094350] RAX: dffffc0000000000 RBX: ffffeafff8fe0000 RCX: 0000000000000000 [ 36.101599] RDX: 1ffffd5fff1fc004 RSI: ffffffff814f5918 RDI: ffffeafff8fe0000 [ 36.108846] RBP: ffff8801bc5a7970 R08: 0000000000033e60 R09: 0000000000000001 [ 36.116091] R10: ffff8801bc108000 R11: 0000000000000001 R12: ffff8801bc5a7c08 [ 36.123343] R13: ffffeafff8fe0020 R14: ffffeafff8fe0000 R15: 0000000000000001 [ 36.130593] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.138796] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.144651] CR2: ffffeafff8fe0020 CR3: 00000001beb91000 CR4: 00000000001606f0 [ 36.151901] Stack: [ 36.154033] ffffeafff8fe0020 ffff8801bc5a7c08 ffff8801c688c800 ffffeafff8fe0000 [ 36.162052] ffff8801c74d92c0 ffff8801bc5a79c8 ffffffff8154cb8f ffff8801bc5a7c18 [ 36.170046] ffff8801bc5a7c10 ffff8801bc5a7c88 00003ffe3f8001e0 00000001c688c000 [ 36.178038] Call Trace: [ 36.180626] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 36.186231] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 36.192352] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 36.198698] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 36.204652] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 36.210083] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 36.215432] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 36.220863] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 36.226116] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 36.231023] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 36.236276] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 36.242920] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 36.248177] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 36.254318] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 36.260275] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 36.265969] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 36.271835] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 36.277437] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 36.283150] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.290058] 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 [ 36.317554] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 36.323933] RSP <ffff8801bc5a7948> [ 36.327588] CR2: ffffeafff8fe0020 [ 36.331020] ---[ end trace ae7c3e7f21bc8ff4 ]--- [ 36.335810] Kernel panic - not syncing: Fatal exception [ 36.341474] Dumping ftrace buffer: [ 36.344994] (ftrace buffer empty) [ 36.348679] Kernel Offset: disabled [ 36.352295] Rebooting in 86400 seconds..