[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.194528] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.253250] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.679997] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.307766] random: sshd: uninitialized urandom read (32 bytes read, 58 bits of entropy available) [ 26.477638] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 32.036055] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) executing program [ 32.136688] BUG: unable to handle kernel paging request at ffffeafff8ce8008 [ 32.144050] IP: [] page_remove_rmap+0x2e/0x260 [ 32.150333] PGD 0 [ 32.152567] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.157577] Dumping ftrace buffer: [ 32.161089] (ftrace buffer empty) [ 32.164772] Modules linked in: [ 32.168055] CPU: 1 PID: 3838 Comm: syz-executor171 Not tainted 4.4.150-g5541782 #19 [ 32.175823] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.185151] task: ffff8801d9aae000 task.stack: ffff8801c7e68000 [ 32.191180] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.199876] RSP: 0018:ffff8801c7e6f948 EFLAGS: 00010246 [ 32.205293] RAX: dffffc0000000000 RBX: ffffeafff8ce8000 RCX: 0000000000000000 [ 32.212534] RDX: 1ffffd5fff19d001 RSI: ffffffff814bceaf RDI: ffffeafff8ce8008 [ 32.219774] RBP: ffff8801c7e6f958 R08: ffffffff85333170 R09: 0000000000000000 [ 32.227015] R10: 0000000000000001 R11: ffff8801d9aae000 R12: 0000000000000001 [ 32.234272] R13: 1ffff10038fcdf2f R14: ffff8801d01c8800 R15: ffffeafff8ce8000 [ 32.241517] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.249714] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.255570] CR2: ffffeafff8ce8008 CR3: 00000001d10b6000 CR4: 00000000001606f0 [ 32.262817] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.270069] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.277325] Stack: [ 32.279442] ffff8801c7e6fbd8 0000000000000001 ffff8801c7e6fa00 ffffffff8150ad13 [ 32.287427] 00003ffe33a001e0 00003ffe33a001e0 0000000041b58ab3 ffffffff841ef837 [ 32.295419] ffffffff8150ab10 00000000000004f0 ffff8801d1df2268 ffff8801c7e6f9c8 [ 32.303412] Call Trace: [ 32.305975] [] zap_huge_pmd+0x203/0x510 [ 32.311574] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.318124] [] unmap_single_vma+0xea3/0x1240 [ 32.324175] [] ? vm_normal_page+0x280/0x280 [ 32.330120] [] ? __put_single_page+0x60/0x60 [ 32.336164] [] unmap_vmas+0x81/0xd0 [ 32.341413] [] exit_mmap+0x1c9/0x3a0 [ 32.346749] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.353338] [] ? up_write+0x1a/0x60 [ 32.358593] [] mmput+0xf8/0x2d0 [ 32.363498] [] do_exit+0x8d8/0x26b0 [ 32.368751] [] ? file_map_prot_check+0x193/0x310 [ 32.375130] [] ? release_task.part.17+0x1200/0x1200 [ 32.381782] [] ? SyS_mprotect+0x41e/0x640 [ 32.387557] [] ? up_write+0x1a/0x60 [ 32.392810] [] ? SyS_mprotect+0x423/0x640 [ 32.398582] [] do_group_exit+0x111/0x330 [ 32.404265] [] ? do_group_exit+0x330/0x330 [ 32.410121] [] SyS_exit_group+0x1d/0x20 [ 32.415722] [] do_fast_syscall_32+0x324/0x8b0 [ 32.421841] [] sysenter_flags_fixed+0xd/0x1a [ 32.427869] Code: e5 41 54 53 48 89 fb e8 31 76 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 03 76 e9 ff f0 83 43 18 ff 78 [ 32.454677] RIP [] page_remove_rmap+0x2e/0x260 [ 32.461004] RSP [ 32.464601] CR2: ffffeafff8ce8008 [ 32.468026] ---[ end trace 8bec410e16d24e01 ]--- [ 32.472759] Kernel panic - not syncing: Fatal exception [ 32.478440] Dumping ftrace buffer: [ 32.481958] (ftrace buffer empty) [ 32.485641] Kernel Offset: disabled [ 32.489240] Rebooting in 86400 seconds..