[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.141279] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.282382] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.613154] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 26.276829] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 31.604857] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 37.121799] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 37.216211] BUG: unable to handle kernel paging request at ffffeafff8d00008 [ 37.223574] IP: [] page_remove_rmap+0x2e/0x260 [ 37.229816] PGD 0 [ 37.232046] Oops: 0000 [#1] PREEMPT SMP KASAN [ 37.236979] Dumping ftrace buffer: [ 37.240485] (ftrace buffer empty) [ 37.244163] Modules linked in: [ 37.247453] CPU: 1 PID: 3848 Comm: syz-executor521 Not tainted 4.4.150-g5541782 #83 [ 37.255213] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.264548] task: ffff8801d968c800 task.stack: ffff8801d9538000 [ 37.270571] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 37.279234] RSP: 0018:ffff8801d953f9c0 EFLAGS: 00010246 [ 37.284651] RAX: dffffc0000000000 RBX: ffffeafff8d00000 RCX: 0000000000000000 [ 37.291892] RDX: 1ffffd5fff1a0001 RSI: ffffffff814bceaf RDI: ffffeafff8d00008 [ 37.299133] RBP: ffff8801d953f9d0 R08: ffffffff85333170 R09: 0000000000000000 [ 37.306578] R10: 0000000000000001 R11: ffff8801d968c800 R12: 0000000000000001 [ 37.313832] R13: 1ffff1003b2a7f3e R14: ffff8801ce373800 R15: ffffeafff8d00000 [ 37.321076] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.329300] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.335156] CR2: ffffeafff8d00008 CR3: 00000001ce3ab000 CR4: 00000000001606f0 [ 37.342398] Stack: [ 37.344521] ffff8801d953fc50 0000000000000001 ffff8801d953fa78 ffffffff8150ad13 [ 37.352505] 00003ffe340001e0 00003ffe340001e0 0000000041b58ab3 ffffffff841ef837 [ 37.360490] ffffffff8150ab10 00000000000004f0 ffff8801ce31ebb0 ffff8801d953fa40 [ 37.368486] Call Trace: [ 37.371047] [] zap_huge_pmd+0x203/0x510 [ 37.376655] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 37.383205] [] unmap_single_vma+0xea3/0x1240 [ 37.389238] [] ? vm_normal_page+0x280/0x280 [ 37.395187] [] ? __put_single_page+0x60/0x60 [ 37.401220] [] unmap_vmas+0x81/0xd0 [ 37.406472] [] exit_mmap+0x1c9/0x3a0 [ 37.411810] [] ? SyS_remap_file_pages+0x870/0x870 [ 37.418275] [] ? up_write+0x1a/0x60 [ 37.423529] [] mmput+0xf8/0x2d0 [ 37.428432] [] do_exit+0x8d8/0x26b0 [ 37.433682] [] ? file_map_prot_check+0x193/0x310 [ 37.440061] [] ? release_task.part.17+0x1200/0x1200 [ 37.446702] [] ? SyS_mprotect+0x41e/0x640 [ 37.452470] [] ? up_write+0x1a/0x60 [ 37.457721] [] ? SyS_mprotect+0x423/0x640 [ 37.463488] [] do_group_exit+0x111/0x330 [ 37.469170] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 37.475644] [] SyS_exit_group+0x1d/0x20 [ 37.481259] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 37.487807] 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 [ 37.514602] RIP [] page_remove_rmap+0x2e/0x260 [ 37.520946] RSP [ 37.524545] CR2: ffffeafff8d00008 [ 37.527971] ---[ end trace 2820c22d47a12da3 ]--- [ 37.532696] Kernel panic - not syncing: Fatal exception [ 37.538349] Dumping ftrace buffer: [ 37.541872] (ftrace buffer empty) [ 37.545553] Kernel Offset: disabled [ 37.549151] Rebooting in 86400 seconds..