[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.825773] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.799544] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.056366] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.759738] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 22.930295] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.0.53' (ECDSA) to the list of known hosts. [ 28.416848] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) executing program [ 28.500828] BUG: unable to handle kernel paging request at ffffeafff8cf8008 [ 28.508199] IP: [] page_remove_rmap+0x2e/0x260 [ 28.514454] PGD 0 [ 28.516719] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.521664] Dumping ftrace buffer: [ 28.525175] (ftrace buffer empty) [ 28.528857] Modules linked in: [ 28.532147] CPU: 1 PID: 3832 Comm: syz-executor204 Not tainted 4.4.150-g5541782 #19 [ 28.539912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.549274] task: ffff8800ad47c800 task.stack: ffff8800bbac8000 [ 28.555303] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.563979] RSP: 0018:ffff8800bbacf948 EFLAGS: 00010246 [ 28.569405] RAX: dffffc0000000000 RBX: ffffeafff8cf8000 RCX: 0000000000000000 [ 28.576650] RDX: 1ffffd5fff19f001 RSI: ffffffff814bceaf RDI: ffffeafff8cf8008 [ 28.583898] RBP: ffff8800bbacf958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.591142] R10: 0000000000000001 R11: ffff8800ad47c800 R12: 0000000000000001 [ 28.598408] R13: 1ffff10017759f2f R14: ffff8801da31e800 R15: ffffeafff8cf8000 [ 28.605655] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.613869] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.619730] CR2: ffffeafff8cf8008 CR3: 00000001cfdf9000 CR4: 00000000001606f0 [ 28.626975] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.634219] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.641461] Stack: [ 28.643584] ffff8800bbacfbd8 0000000000000001 ffff8800bbacfa00 ffffffff8150ad13 [ 28.651571] 00003ffe33e001e0 00003ffe33e001e0 0000000041b58ab3 ffffffff841ef837 [ 28.659595] ffffffff8150ab10 00000000000004f0 ffff8800b3b4ac08 ffff8800bbacf9c8 [ 28.667578] Call Trace: [ 28.670145] [] zap_huge_pmd+0x203/0x510 [ 28.675742] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.682315] [] unmap_single_vma+0xea3/0x1240 [ 28.688350] [] ? vm_normal_page+0x280/0x280 [ 28.694310] [] ? __put_single_page+0x60/0x60 [ 28.700341] [] unmap_vmas+0x81/0xd0 [ 28.705592] [] exit_mmap+0x1c9/0x3a0 [ 28.710931] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.717397] [] ? up_write+0x1a/0x60 [ 28.722665] [] mmput+0xf8/0x2d0 [ 28.727566] [] do_exit+0x8d8/0x26b0 [ 28.732817] [] ? file_map_prot_check+0x193/0x310 [ 28.739194] [] ? release_task.part.17+0x1200/0x1200 [ 28.745834] [] ? SyS_mprotect+0x41e/0x640 [ 28.751606] [] ? up_write+0x1a/0x60 [ 28.756859] [] ? SyS_mprotect+0x423/0x640 [ 28.762635] [] do_group_exit+0x111/0x330 [ 28.768317] [] ? do_group_exit+0x330/0x330 [ 28.774189] [] SyS_exit_group+0x1d/0x20 [ 28.779790] [] do_fast_syscall_32+0x324/0x8b0 [ 28.785928] [] sysenter_flags_fixed+0xd/0x1a [ 28.791956] 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 [ 28.818782] RIP [] page_remove_rmap+0x2e/0x260 [ 28.825107] RSP [ 28.828706] CR2: ffffeafff8cf8008 [ 28.832137] ---[ end trace b43b220362395d94 ]--- [ 28.836875] Kernel panic - not syncing: Fatal exception [ 28.842595] Dumping ftrace buffer: [ 28.846114] (ftrace buffer empty) [ 28.849796] Kernel Offset: disabled [ 28.853396] Rebooting in 86400 seconds..