[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.930539] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.945665] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.251847] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.959115] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) [ 28.131632] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.39' (ECDSA) to the list of known hosts. [ 33.899590] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 33.988148] BUG: unable to handle kernel paging request at ffffeafffd350008 [ 33.995504] IP: [] page_remove_rmap+0x2e/0x260 [ 34.001764] PGD 0 [ 34.004026] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.008999] Dumping ftrace buffer: [ 34.012507] (ftrace buffer empty) [ 34.016193] Modules linked in: [ 34.019478] CPU: 0 PID: 3788 Comm: syz-executor001 Not tainted 4.4.150-g5541782 #83 [ 34.027242] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.036586] task: ffff8801cae40000 task.stack: ffff8801ca100000 [ 34.042630] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.051310] RSP: 0018:ffff8801ca1079c0 EFLAGS: 00010246 [ 34.056733] RAX: dffffc0000000000 RBX: ffffeafffd350000 RCX: 0000000000000000 [ 34.063977] RDX: 1ffffd5fffa6a001 RSI: ffffffff814bceaf RDI: ffffeafffd350008 [ 34.071220] RBP: ffff8801ca1079d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.078501] R10: 0000000000000001 R11: ffff8801cae40000 R12: 0000000000000001 [ 34.085763] R13: 1ffff10039420f3e R14: ffff8800bb84a800 R15: ffffeafffd350000 [ 34.093016] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.101231] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.107089] CR2: ffffeafffd350008 CR3: 00000000af758000 CR4: 00000000001606f0 [ 34.114333] Stack: [ 34.116455] ffff8801ca107c50 0000000000000001 ffff8801ca107a78 ffffffff8150ad13 [ 34.124445] 00003fff4d4001e0 00003fff4d4001e0 0000000041b58ab3 ffffffff841ef837 [ 34.132454] ffffffff8150ab10 00000000000004f0 ffff8801d1f1b1b8 ffff8801ca107a40 [ 34.140451] Call Trace: [ 34.143045] [] zap_huge_pmd+0x203/0x510 [ 34.148659] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.155222] [] unmap_single_vma+0xea3/0x1240 [ 34.161270] [] ? vm_normal_page+0x280/0x280 [ 34.167217] [] ? __put_single_page+0x60/0x60 [ 34.173247] [] unmap_vmas+0x81/0xd0 [ 34.178497] [] exit_mmap+0x1c9/0x3a0 [ 34.183838] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.190320] [] ? up_write+0x1a/0x60 [ 34.195573] [] mmput+0xf8/0x2d0 [ 34.200493] [] do_exit+0x8d8/0x26b0 [ 34.205753] [] ? file_map_prot_check+0x193/0x310 [ 34.212137] [] ? release_task.part.17+0x1200/0x1200 [ 34.218784] [] ? SyS_mprotect+0x41e/0x640 [ 34.224556] [] ? up_write+0x1a/0x60 [ 34.229809] [] ? SyS_mprotect+0x423/0x640 [ 34.235598] [] do_group_exit+0x111/0x330 [ 34.241301] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.247788] [] SyS_exit_group+0x1d/0x20 [ 34.253391] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.259939] 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 [ 34.286978] RIP [] page_remove_rmap+0x2e/0x260 [ 34.293312] RSP [ 34.296923] CR2: ffffeafffd350008 [ 34.300352] ---[ end trace b00a60b0099d8dbd ]--- [ 34.305079] Kernel panic - not syncing: Fatal exception [ 34.310716] Dumping ftrace buffer: [ 34.314237] (ftrace buffer empty) [ 34.317920] Kernel Offset: disabled [ 34.321519] Rebooting in 86400 seconds..