[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.161968] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.180633] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.666894] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.462833] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 45.386418] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 51.016899] random: sshd: uninitialized urandom read (32 bytes read, 86 bits of entropy available) executing program [ 51.106026] BUG: unable to handle kernel paging request at ffffeafff8ba0008 [ 51.113545] IP: [] page_remove_rmap+0x2e/0x260 [ 51.119814] PGD 0 [ 51.122112] Oops: 0000 [#1] PREEMPT SMP KASAN [ 51.127141] Dumping ftrace buffer: [ 51.130654] (ftrace buffer empty) [ 51.134335] Modules linked in: [ 51.137618] CPU: 1 PID: 3802 Comm: syz-executor290 Not tainted 4.4.150-g5541782 #19 [ 51.145484] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.154819] task: ffff8801ca874800 task.stack: ffff8800bbbd0000 [ 51.161010] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 51.169873] RSP: 0018:ffff8800bbbd7948 EFLAGS: 00010246 [ 51.175298] RAX: dffffc0000000000 RBX: ffffeafff8ba0000 RCX: 0000000000000000 [ 51.182545] RDX: 1ffffd5fff174001 RSI: ffffffff814bceaf RDI: ffffeafff8ba0008 [ 51.190000] RBP: ffff8800bbbd7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 51.197296] R10: 0000000000000001 R11: ffff8801ca874800 R12: 0000000000000001 [ 51.204546] R13: 1ffff1001777af2f R14: ffff8800bb356800 R15: ffffeafff8ba0000 [ 51.211793] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 51.220065] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 51.225931] CR2: ffffeafff8ba0008 CR3: 00000000b6695000 CR4: 00000000001606f0 [ 51.233184] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.240435] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.247679] Stack: [ 51.249800] ffff8800bbbd7bd8 0000000000000001 ffff8800bbbd7a00 ffffffff8150ad13 [ 51.257847] 00003ffe2e8001e0 00003ffe2e8001e0 0000000041b58ab3 ffffffff841ef837 [ 51.265828] ffffffff8150ab10 00000000000004f0 ffff8800af261688 ffff8800bbbd79c8 [ 51.273812] Call Trace: [ 51.276381] [] zap_huge_pmd+0x203/0x510 [ 51.281987] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 51.288544] [] unmap_single_vma+0xea3/0x1240 [ 51.294657] [] ? vm_normal_page+0x280/0x280 [ 51.300611] [] ? __put_single_page+0x60/0x60 [ 51.306640] [] unmap_vmas+0x81/0xd0 [ 51.311957] [] exit_mmap+0x1c9/0x3a0 [ 51.317303] [] ? SyS_remap_file_pages+0x870/0x870 [ 51.323770] [] ? up_write+0x1a/0x60 [ 51.329021] [] mmput+0xf8/0x2d0 [ 51.333931] [] do_exit+0x8d8/0x26b0 [ 51.339190] [] ? file_map_prot_check+0x193/0x310 [ 51.345569] [] ? release_task.part.17+0x1200/0x1200 [ 51.352390] [] ? SyS_mprotect+0x41e/0x640 [ 51.358168] [] ? up_write+0x1a/0x60 [ 51.363425] [] ? SyS_mprotect+0x423/0x640 [ 51.369205] [] do_group_exit+0x111/0x330 [ 51.374892] [] ? do_group_exit+0x330/0x330 [ 51.380822] [] SyS_exit_group+0x1d/0x20 [ 51.386432] [] do_fast_syscall_32+0x324/0x8b0 [ 51.392557] [] sysenter_flags_fixed+0xd/0x1a [ 51.398828] 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 [ 51.425736] RIP [] page_remove_rmap+0x2e/0x260 [ 51.432068] RSP [ 51.435675] CR2: ffffeafff8ba0008 [ 51.439103] ---[ end trace 7d09641ff533e818 ]--- [ 51.443952] Kernel panic - not syncing: Fatal exception [ 51.449603] Dumping ftrace buffer: [ 51.453119] (ftrace buffer empty) [ 51.456801] Kernel Offset: disabled [ 51.460403] Rebooting in 86400 seconds..