[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.304980] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.068403] random: sshd: uninitialized urandom read (32 bytes read) [ 21.338087] random: sshd: uninitialized urandom read (32 bytes read) [ 21.852199] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 27.514967] urandom_read: 1 callbacks suppressed [ 27.514970] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.604795] BUG: unable to handle kernel paging request at ffffeafff90b8020 [ 27.612254] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.619063] PGD 0 [ 27.621026] [ 27.622655] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.627133] Dumping ftrace buffer: [ 27.630658] (ftrace buffer empty) [ 27.634348] Modules linked in: [ 27.637890] CPU: 1 PID: 3789 Comm: syz-executor138 Not tainted 4.9.122-g54068d6 #78 [ 27.645776] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.655109] task: ffff8801b8918000 task.stack: ffff8801b87e0000 [ 27.661139] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.669976] RSP: 0018:ffff8801b87e7948 EFLAGS: 00010246 [ 27.675509] RAX: dffffc0000000000 RBX: ffffeafff90b8000 RCX: 0000000000000000 [ 27.682759] RDX: 1ffffd5fff217004 RSI: ffffffff814f5918 RDI: ffffeafff90b8000 [ 27.690003] RBP: ffff8801b87e7970 R08: 00000000000342c0 R09: 0000000000000001 [ 27.697253] R10: ffff8801b8918000 R11: 0000000000000001 R12: ffff8801b87e7c08 [ 27.704502] R13: ffffeafff90b8020 R14: ffffeafff90b8000 R15: 0000000000000001 [ 27.711749] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.719950] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.725806] CR2: ffffeafff90b8020 CR3: 00000001c8e97000 CR4: 00000000001606f0 [ 27.733049] Stack: [ 27.735181] ffffeafff90b8020 ffff8801b87e7c08 ffff8801c8f3c800 ffffeafff90b8000 [ 27.743222] ffff8801b8511e70 ffff8801b87e79c8 ffffffff8154cb8f ffff8801b87e7c18 [ 27.751208] ffff8801b87e7c10 ffff8801b87e7c88 00003ffe42e001e0 00000001c8f3c000 [ 27.759245] Call Trace: [ 27.761809] [] zap_huge_pmd+0x16f/0x860 [ 27.767409] [] unmap_page_range+0x12ad/0x1730 [ 27.773536] [] ? vm_normal_page_pmd+0x310/0x310 [ 27.779834] [] unmap_single_vma+0x101/0x260 [ 27.785789] [] unmap_vmas+0x102/0x1d0 [ 27.791213] [] exit_mmap+0x214/0x3f0 [ 27.796558] [] ? SyS_munmap+0xa0/0xa0 [ 27.802031] [] ? up_write+0x1a/0x60 [ 27.807290] [] mmput+0xf3/0x2d0 [ 27.812197] [] do_exit+0x906/0x27b0 [ 27.817502] [] ? release_task.part.19+0x1210/0x1210 [ 27.824148] [] ? up_write+0x1a/0x60 [ 27.829408] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.835601] [] ? mprotect_fixup+0x930/0x930 [ 27.841639] [] do_group_exit+0x111/0x340 [ 27.847325] [] ? do_group_exit+0x340/0x340 [ 27.853181] [] SyS_exit_group+0x1d/0x20 [ 27.858778] [] do_syscall_64+0x1a6/0x490 [ 27.864463] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.871358] 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 [ 27.898408] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.904740] RSP [ 27.908339] CR2: ffffeafff90b8020 [ 27.911769] ---[ end trace 026c014c3cb66220 ]--- [ 27.916496] Kernel panic - not syncing: Fatal exception [ 27.922257] Dumping ftrace buffer: [ 27.925839] (ftrace buffer empty) [ 27.929629] Kernel Offset: disabled [ 27.933233] Rebooting in 86400 seconds..