[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.537738] 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: [ 24.270995] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.498736] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.095220] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 25.282961] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 30.962339] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) executing program [ 31.051308] BUG: unable to handle kernel paging request at ffffeafff8ce0008 [ 31.058879] IP: [] page_remove_rmap+0x2e/0x260 [ 31.065142] PGD 0 [ 31.067393] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.072368] Dumping ftrace buffer: [ 31.076021] (ftrace buffer empty) [ 31.079713] Modules linked in: [ 31.083007] CPU: 1 PID: 3742 Comm: syz-executor639 Not tainted 4.4.150-g5541782 #83 [ 31.090777] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.100186] task: ffff8801d07ec800 task.stack: ffff8801ccbf8000 [ 31.106227] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.114922] RSP: 0018:ffff8801ccbff9c0 EFLAGS: 00010246 [ 31.120351] RAX: dffffc0000000000 RBX: ffffeafff8ce0000 RCX: ffffea00072d8000 [ 31.127609] RDX: 1ffffd5fff19c001 RSI: ffffffff814bceaf RDI: ffffeafff8ce0008 [ 31.134866] RBP: ffff8801ccbff9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.142121] R10: 0000000000000001 R11: ffff8801d07ec800 R12: 0000000000000001 [ 31.149372] R13: 1ffff1003997ff3e R14: ffff8801d1135800 R15: ffffeafff8ce0000 [ 31.156629] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.164834] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.170692] CR2: ffffeafff8ce0008 CR3: 00000001cdc63000 CR4: 00000000001606f0 [ 31.177940] Stack: [ 31.180066] ffff8801ccbffc50 0000000000000001 ffff8801ccbffa78 ffffffff8150ad13 [ 31.188100] 00003ffe338001e0 00003ffe338001e0 0000000041b58ab3 ffffffff841ef837 [ 31.196155] ffffffff8150ab10 00000000000004f0 ffff8801cd437d10 ffff8801ccbffa40 [ 31.204311] Call Trace: [ 31.206882] [] zap_huge_pmd+0x203/0x510 [ 31.212497] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.219055] [] unmap_single_vma+0xea3/0x1240 [ 31.225095] [] ? vm_normal_page+0x280/0x280 [ 31.231061] [] ? __put_single_page+0x60/0x60 [ 31.237499] [] unmap_vmas+0x81/0xd0 [ 31.242773] [] exit_mmap+0x1c9/0x3a0 [ 31.248133] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.254690] [] ? kmem_cache_free+0x2b4/0x340 [ 31.260740] [] mmput+0xf8/0x2d0 [ 31.265654] [] do_exit+0x8d8/0x26b0 [ 31.270928] [] ? file_map_prot_check+0x193/0x310 [ 31.277321] [] ? release_task.part.17+0x1200/0x1200 [ 31.283976] [] ? SyS_mprotect+0x41e/0x640 [ 31.289760] [] ? up_write+0x1a/0x60 [ 31.295027] [] ? SyS_mprotect+0x423/0x640 [ 31.300823] [] do_group_exit+0x111/0x330 [ 31.306531] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.313015] [] SyS_exit_group+0x1d/0x20 [ 31.318632] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.325186] 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 [ 31.352143] RIP [] page_remove_rmap+0x2e/0x260 [ 31.358511] RSP [ 31.362136] CR2: ffffeafff8ce0008 [ 31.365575] ---[ end trace 000ae9e60e383bef ]--- [ 31.370317] Kernel panic - not syncing: Fatal exception [ 31.376105] Dumping ftrace buffer: [ 31.379633] (ftrace buffer empty) [ 31.383320] Kernel Offset: disabled [ 31.386929] Rebooting in 86400 seconds..