[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.579756] 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: [ 15.410923] random: sshd: uninitialized urandom read (32 bytes read) [ 15.739498] random: sshd: uninitialized urandom read (32 bytes read) [ 16.223494] random: sshd: uninitialized urandom read (32 bytes read) [ 20.574115] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. [ 26.245628] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.367651] BUG: unable to handle kernel paging request at ffffeafff8d48020 [ 26.374994] IP: [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.381267] PGD 0 [ 26.383214] [ 26.384833] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.389301] Dumping ftrace buffer: [ 26.392814] (ftrace buffer empty) [ 26.396509] Modules linked in: [ 26.399803] CPU: 0 PID: 3795 Comm: syz-executor648 Not tainted 4.9.122-g54068d6 #26 [ 26.407632] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.416969] task: ffff8801b94b6000 task.stack: ffff8801cba50000 [ 26.423042] RIP: 0010:[<ffffffff814f5937>] [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.431753] RSP: 0018:ffff8801cba57948 EFLAGS: 00010246 [ 26.437283] RAX: dffffc0000000000 RBX: ffffeafff8d48000 RCX: 0000000000000000 [ 26.444539] RDX: 1ffffd5fff1a9004 RSI: ffffffff814f5918 RDI: ffffeafff8d48000 [ 26.451824] RBP: ffff8801cba57970 R08: 0000000000034040 R09: 0000000000000001 [ 26.459078] R10: ffff8801b94b6000 R11: 0000000000000001 R12: ffff8801cba57c08 [ 26.466328] R13: ffffeafff8d48020 R14: ffffeafff8d48000 R15: 0000000000000001 [ 26.473582] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.481794] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.487657] CR2: ffffeafff8d48020 CR3: 00000001c87fc000 CR4: 00000000001606f0 [ 26.494909] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.502160] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.509416] Stack: [ 26.511546] ffffeafff8d48020 ffff8801cba57c08 ffff8801c5cf8800 ffffeafff8d48000 [ 26.519550] ffff8801c5e06318 ffff8801cba579c8 ffffffff8154cb8f ffff8801cba57c18 [ 26.527593] ffff8801cba57c10 ffff8801cba57c88 00003ffe352001e0 00000001c5cf8000 [ 26.535603] Call Trace: [ 26.538176] [<ffffffff8154cb8f>] zap_huge_pmd+0x16f/0x860 [ 26.543785] [<ffffffff814cae6d>] unmap_page_range+0x12ad/0x1730 [ 26.550059] [<ffffffff814c9bc0>] ? vm_normal_page_pmd+0x310/0x310 [ 26.556499] [<ffffffff814cb3f1>] unmap_single_vma+0x101/0x260 [ 26.562455] [<ffffffff814cbd32>] unmap_vmas+0x102/0x1d0 [ 26.567887] [<ffffffff814e4834>] exit_mmap+0x214/0x3f0 [ 26.573230] [<ffffffff814e4620>] ? SyS_munmap+0xa0/0xa0 [ 26.578667] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 26.583922] [<ffffffff8112db23>] mmput+0xf3/0x2d0 [ 26.588829] [<ffffffff81143056>] do_exit+0x906/0x27b0 [ 26.594089] [<ffffffff81142750>] ? release_task.part.19+0x1210/0x1210 [ 26.600734] [<ffffffff8122e58a>] ? up_write+0x1a/0x60 [ 26.605994] [<ffffffff814ece0d>] ? do_mprotect_pkey+0x71d/0x890 [ 26.612153] [<ffffffff814ec6f0>] ? mprotect_fixup+0x930/0x930 [ 26.618119] [<ffffffff81149211>] do_group_exit+0x111/0x340 [ 26.623903] [<ffffffff81149440>] ? do_group_exit+0x340/0x340 [ 26.629778] [<ffffffff8114945d>] SyS_exit_group+0x1d/0x20 [ 26.635468] [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 [ 26.641335] [<ffffffff83a00cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.648284] 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 [ 26.675741] RIP [<ffffffff814f5937>] page_remove_rmap+0x37/0x6d0 [ 26.682125] RSP <ffff8801cba57948> [ 26.685724] CR2: ffffeafff8d48020 [ 26.689196] ---[ end trace 2530632f1c9ad557 ]--- [ 26.693931] Kernel panic - not syncing: Fatal exception [ 26.699784] Dumping ftrace buffer: [ 26.703302] (ftrace buffer empty) [ 26.706990] Kernel Offset: disabled [ 26.710597] Rebooting in 86400 seconds..