[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.981265] 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: [ 17.356063] random: sshd: uninitialized urandom read (32 bytes read) [ 17.528441] random: sshd: uninitialized urandom read (32 bytes read) [ 18.015046] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. [ 23.732016] urandom_read: 1 callbacks suppressed [ 23.732019] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.817164] BUG: unable to handle kernel paging request at ffffeafff90f8020 [ 23.824507] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 23.830744] PGD 0 [ 23.832687] [ 23.834306] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.838791] Dumping ftrace buffer: [ 23.842313] (ftrace buffer empty) [ 23.845998] Modules linked in: [ 23.849292] CPU: 0 PID: 3788 Comm: syz-executor513 Not tainted 4.9.122-g54068d6 #78 [ 23.857057] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.866403] task: ffff8801b8d5c800 task.stack: ffff8801b72d0000 [ 23.872429] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 23.881099] RSP: 0018:ffff8801b72d7948 EFLAGS: 00010246 [ 23.886518] RAX: dffffc0000000000 RBX: ffffeafff90f8000 RCX: 0000000000000000 [ 23.893759] RDX: 1ffffd5fff21f004 RSI: ffffffff814f5918 RDI: ffffeafff90f8000 [ 23.901000] RBP: ffff8801b72d7970 R08: 00000000000343a0 R09: 0000000000000001 [ 23.908241] R10: ffff8801b8d5c800 R11: 0000000000000001 R12: ffff8801b72d7c08 [ 23.915510] R13: ffffeafff90f8020 R14: ffffeafff90f8000 R15: 0000000000000001 [ 23.922753] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.930951] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.936806] CR2: ffffeafff90f8020 CR3: 00000001bc792000 CR4: 00000000001606f0 [ 23.944059] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 23.951305] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 23.958543] Stack: [ 23.960667] ffffeafff90f8020 ffff8801b72d7c08 ffff8801bb048800 ffffeafff90f8000 [ 23.968648] ffff8801b7683268 ffff8801b72d79c8 ffffffff8154cb8f ffff8801b72d7c18 [ 23.976629] ffff8801b72d7c10 ffff8801b72d7c88 00003ffe43e001e0 00000001bb048000 [ 23.984608] Call Trace: [ 23.987173] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 23.992772] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 23.998938] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 24.005228] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 24.011173] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 24.016595] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 24.021932] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 24.027363] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 24.032611] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 24.037514] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 24.042764] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 24.049404] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 24.054651] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 24.060770] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 24.066715] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 24.072397] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 24.078253] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 24.083864] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 24.089564] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.096457] 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 [ 24.123329] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 24.129659] RSP <ffff8801b72d7948> [ 24.133253] CR2: ffffeafff90f8020 [ 24.136679] ---[ end trace b78ab7a38f0d7e29 ]--- [ 24.141406] Kernel panic - not syncing: Fatal exception [ 24.147084] Dumping ftrace buffer: [ 24.150597] (ftrace buffer empty) [ 24.154280] Kernel Offset: disabled [ 24.157876] Rebooting in 86400 seconds..