[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.143695] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.039512] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.426823] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 22.211658] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 33.453611] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 39.228516] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) executing program [ 39.323965] BUG: unable to handle kernel paging request at ffffeafff8cb8008 [ 39.331451] IP: [] page_remove_rmap+0x2e/0x260 [ 39.337699] PGD 0 [ 39.339937] Oops: 0000 [#1] PREEMPT SMP KASAN [ 39.344914] Dumping ftrace buffer: [ 39.348436] (ftrace buffer empty) [ 39.352149] Modules linked in: [ 39.352158] CPU: 1 PID: 3682 Comm: syz-executor896 Not tainted 4.4.149-gf76bdbd #18 [ 39.352162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.352170] task: ffff8800b351c800 task.stack: ffff8801ceae0000 [ 39.352183] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 39.352187] RSP: 0018:ffff8801ceae7948 EFLAGS: 00010246 [ 39.352191] RAX: dffffc0000000000 RBX: ffffeafff8cb8000 RCX: 0000000000000000 [ 39.352195] RDX: 1ffffd5fff197001 RSI: ffffffff814bc8bf RDI: ffffeafff8cb8008 [ 39.352199] RBP: ffff8801ceae7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 39.352203] R10: 0000000000000001 R11: ffff8800b351c800 R12: 0000000000000001 [ 39.352207] R13: 1ffff10039d5cf2f R14: ffff8801cebd2800 R15: ffffeafff8cb8000 [ 39.352213] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 39.352218] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 39.352222] CR2: ffffeafff8cb8008 CR3: 00000001ce076000 CR4: 00000000001606f0 [ 39.352230] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.352234] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.352235] Stack: [ 39.352245] ffff8801ceae7bd8 0000000000000001 ffff8801ceae7a00 ffffffff8150a443 [ 39.352253] 00003ffe32e001e0 00003ffe32e001e0 0000000041b58ab3 ffffffff841ef837 [ 39.352262] ffffffff8150a240 00000000000004f0 ffff8800b2c64d10 ffff8801ceae79c8 [ 39.352263] Call Trace: [ 39.352274] [] zap_huge_pmd+0x203/0x510 [ 39.352283] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 39.352290] [] unmap_single_vma+0xea3/0x1240 [ 39.352297] [] ? vm_normal_page+0x230/0x230 [ 39.352305] [] ? __put_single_page+0x60/0x60 [ 39.352312] [] unmap_vmas+0x81/0xd0 [ 39.352319] [] exit_mmap+0x1c9/0x3a0 [ 39.352327] [] ? SyS_remap_file_pages+0x870/0x870 [ 39.352337] [] ? up_write+0x1a/0x60 [ 39.352346] [] mmput+0xf8/0x2d0 [ 39.352353] [] do_exit+0x8d8/0x26b0 [ 39.352363] [] ? file_map_prot_check+0x193/0x310 [ 39.352370] [] ? release_task.part.17+0x1200/0x1200 [ 39.352378] [] ? SyS_mprotect+0x41e/0x640 [ 39.352385] [] ? up_write+0x1a/0x60 [ 39.352391] [] ? SyS_mprotect+0x423/0x640 [ 39.352398] [] do_group_exit+0x111/0x330 [ 39.352404] [] ? do_group_exit+0x330/0x330 [ 39.352411] [] SyS_exit_group+0x1d/0x20 [ 39.352420] [] do_fast_syscall_32+0x324/0x8b0 [ 39.352428] [] sysenter_flags_fixed+0xd/0x1a [ 39.352542] Code: e5 41 54 53 48 89 fb e8 e1 77 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 b3 77 e9 ff f0 83 43 18 ff 78 [ 39.352551] RIP [] page_remove_rmap+0x2e/0x260 [ 39.352560] RSP [ 39.352562] CR2: ffffeafff8cb8008 [ 39.352569] ---[ end trace 90b7aa5424f64a2a ]--- [ 39.352574] Kernel panic - not syncing: Fatal exception [ 39.355667] Dumping ftrace buffer: [ 39.355670] (ftrace buffer empty) [ 39.355673] Kernel Offset: disabled [ 39.666720] Rebooting in 86400 seconds..