[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.817642] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.565942] random: sshd: uninitialized urandom read (32 bytes read) [ 21.045415] random: sshd: uninitialized urandom read (32 bytes read) [ 21.544619] random: sshd: uninitialized urandom read (32 bytes read) [ 21.694816] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. [ 27.199789] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.281411] BUG: unable to handle kernel paging request at ffffeafff9178020 [ 27.288779] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.295022] PGD 0 [ 27.296966] [ 27.298587] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.303051] Dumping ftrace buffer: [ 27.306562] (ftrace buffer empty) [ 27.310249] Modules linked in: [ 27.313538] CPU: 1 PID: 3799 Comm: syz-executor744 Not tainted 4.9.121-g681e57b #77 [ 27.321302] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.330982] task: ffff8801b6583000 task.stack: ffff8801b8068000 [ 27.337010] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.345683] RSP: 0018:ffff8801b806f948 EFLAGS: 00010246 [ 27.351102] RAX: dffffc0000000000 RBX: ffffeafff9178000 RCX: 0000000000000000 [ 27.358344] RDX: 1ffffd5fff22f004 RSI: ffffffff814f5278 RDI: ffffeafff9178000 [ 27.365591] RBP: ffff8801b806f970 R08: 0000000000033fc0 R09: 0000000000000001 [ 27.372836] R10: ffff8801b6583000 R11: 0000000000000001 R12: ffff8801b806fc08 [ 27.380081] R13: ffffeafff9178020 R14: ffffeafff9178000 R15: 0000000000000001 [ 27.387434] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.395636] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.401497] CR2: ffffeafff9178020 CR3: 00000001c5298000 CR4: 00000000001606f0 [ 27.408870] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.416128] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.423378] Stack: [ 27.425511] ffffeafff9178020 ffff8801b806fc08 ffff8801c9256800 ffffeafff9178000 [ 27.433499] ffff8801b6977d68 ffff8801b806f9c8 ffffffff8154c20f ffff8801b806fc18 [ 27.441521] ffff8801b806fc10 ffff8801b806fc88 00003ffe45e001e0 00000001c9256000 [ 27.449615] Call Trace: [ 27.452181] [] zap_huge_pmd+0x16f/0x860 [ 27.457788] [] unmap_page_range+0x12ad/0x1730 [ 27.463910] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.470206] [] unmap_single_vma+0x101/0x260 [ 27.476151] [] unmap_vmas+0x102/0x1d0 [ 27.481623] [] exit_mmap+0x214/0x3f0 [ 27.486969] [] ? SyS_munmap+0xa0/0xa0 [ 27.492395] [] ? up_write+0x1a/0x60 [ 27.497647] [] mmput+0xf3/0x2d0 [ 27.502553] [] do_exit+0x906/0x27b0 [ 27.507916] [] ? release_task.part.19+0x1210/0x1210 [ 27.514561] [] ? up_write+0x1a/0x60 [ 27.519815] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.525938] [] ? mprotect_fixup+0x930/0x930 [ 27.531892] [] do_group_exit+0x111/0x340 [ 27.537580] [] ? do_group_exit+0x340/0x340 [ 27.543441] [] SyS_exit_group+0x1d/0x20 [ 27.549052] [] do_syscall_64+0x1a6/0x490 [ 27.554742] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.561712] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 27.588562] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.594899] RSP [ 27.598499] CR2: ffffeafff9178020 [ 27.601930] ---[ end trace 051da10d804a202c ]--- [ 27.606662] Kernel panic - not syncing: Fatal exception [ 27.612362] Dumping ftrace buffer: [ 27.615882] (ftrace buffer empty) [ 27.619672] Kernel Offset: disabled [ 27.623284] Rebooting in 86400 seconds..