[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.001624] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.366284] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 25.755678] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.506444] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 26.674406] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 32.275678] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) executing program [ 32.365444] BUG: unable to handle kernel paging request at ffffeafffd2b0008 [ 32.373105] IP: [] page_remove_rmap+0x2e/0x260 [ 32.379408] PGD 0 [ 32.381692] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.386812] Dumping ftrace buffer: [ 32.390343] (ftrace buffer empty) [ 32.394043] Modules linked in: [ 32.397365] CPU: 1 PID: 3752 Comm: syz-executor427 Not tainted 4.4.149-gf76bdbd #18 [ 32.405332] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.414677] task: ffff8801cc54c800 task.stack: ffff8800b0ad0000 [ 32.420840] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.429549] RSP: 0018:ffff8800b0ad7948 EFLAGS: 00010246 [ 32.435102] RAX: dffffc0000000000 RBX: ffffeafffd2b0000 RCX: 0000000000000000 [ 32.442566] RDX: 1ffffd5fffa56001 RSI: ffffffff814bc8bf RDI: ffffeafffd2b0008 [ 32.449882] RBP: ffff8800b0ad7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.457194] R10: 0000000000000001 R11: ffff8801cc54c800 R12: 0000000000000001 [ 32.464512] R13: 1ffff1001615af2f R14: ffff8800b570b800 R15: ffffeafffd2b0000 [ 32.471816] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.480032] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.486022] CR2: ffffeafffd2b0008 CR3: 00000000b5ee3000 CR4: 00000000001606f0 [ 32.493283] Stack: [ 32.495568] ffff8800b0ad7bd8 0000000000000001 ffff8800b0ad7a00 ffffffff8150a443 [ 32.503711] 00003fff4ac001e0 00003fff4ac001e0 0000000041b58ab3 ffffffff841ef837 [ 32.511836] ffffffff8150a240 00000000000004f0 ffff8800b1715b00 ffff8800b0ad79c8 [ 32.520061] Call Trace: [ 32.522642] [] zap_huge_pmd+0x203/0x510 [ 32.528262] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.534838] [] unmap_single_vma+0xea3/0x1240 [ 32.541013] [] ? vm_normal_page+0x230/0x230 [ 32.546987] [] ? __put_single_page+0x60/0x60 [ 32.553035] [] unmap_vmas+0x81/0xd0 [ 32.558303] [] exit_mmap+0x1c9/0x3a0 [ 32.563659] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.570357] [] ? up_write+0x1a/0x60 [ 32.575627] [] mmput+0xf8/0x2d0 [ 32.580549] [] do_exit+0x8d8/0x26b0 [ 32.585838] [] ? file_map_prot_check+0x193/0x310 [ 32.592236] [] ? release_task.part.17+0x1200/0x1200 [ 32.598895] [] ? SyS_mprotect+0x41e/0x640 [ 32.604683] [] ? up_write+0x1a/0x60 [ 32.609953] [] ? SyS_mprotect+0x423/0x640 [ 32.615819] [] do_group_exit+0x111/0x330 [ 32.621600] [] ? do_group_exit+0x330/0x330 [ 32.627531] [] SyS_exit_group+0x1d/0x20 [ 32.633150] [] do_fast_syscall_32+0x324/0x8b0 [ 32.639342] [] sysenter_flags_fixed+0xd/0x1a [ 32.645497] 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 [ 32.673979] RIP [] page_remove_rmap+0x2e/0x260 [ 32.680372] RSP [ 32.684056] CR2: ffffeafffd2b0008 [ 32.687502] ---[ end trace 10f5ab21b9e067aa ]--- [ 32.692246] Kernel panic - not syncing: Fatal exception [ 32.698017] Dumping ftrace buffer: [ 32.701565] (ftrace buffer empty) [ 32.705321] Kernel Offset: disabled [ 32.708938] Rebooting in 86400 seconds..