[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.635827] 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: [ 23.607078] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.942847] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.623449] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 24.803471] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. [ 30.399805] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 30.487020] BUG: unable to handle kernel paging request at ffffeafff8da8008 [ 30.494378] IP: [] page_remove_rmap+0x2e/0x260 [ 30.500641] PGD 0 [ 30.502879] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.507818] Dumping ftrace buffer: [ 30.511330] (ftrace buffer empty) [ 30.515015] Modules linked in: [ 30.518321] CPU: 0 PID: 3793 Comm: syz-executor005 Not tainted 4.4.150-g5541782 #83 [ 30.526110] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.535438] task: ffff8801ca3a1800 task.stack: ffff8801d95c8000 [ 30.541483] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.550160] RSP: 0018:ffff8801d95cf9c0 EFLAGS: 00010246 [ 30.555580] RAX: dffffc0000000000 RBX: ffffeafff8da8000 RCX: 0000000000000000 [ 30.562826] RDX: 1ffffd5fff1b5001 RSI: ffffffff814bceaf RDI: ffffeafff8da8008 [ 30.570070] RBP: ffff8801d95cf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.577313] R10: 0000000000000001 R11: ffff8801ca3a1800 R12: 0000000000000001 [ 30.584560] R13: 1ffff1003b2b9f3e R14: ffff8801d1315800 R15: ffffeafff8da8000 [ 30.591806] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.600006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.605860] CR2: ffffeafff8da8008 CR3: 00000001ce899000 CR4: 00000000001606f0 [ 30.613103] Stack: [ 30.615226] ffff8801d95cfc50 0000000000000001 ffff8801d95cfa78 ffffffff8150ad13 [ 30.623213] 00003ffe36a001e0 00003ffe36a001e0 0000000041b58ab3 ffffffff841ef837 [ 30.631197] ffffffff8150ab10 00000000000004f0 ffff8801cf983738 ffff8801d95cfa40 [ 30.639180] Call Trace: [ 30.641747] [] zap_huge_pmd+0x203/0x510 [ 30.647349] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.653917] [] unmap_single_vma+0xea3/0x1240 [ 30.659957] [] ? vm_normal_page+0x280/0x280 [ 30.665908] [] ? __put_single_page+0x60/0x60 [ 30.671939] [] unmap_vmas+0x81/0xd0 [ 30.677196] [] exit_mmap+0x1c9/0x3a0 [ 30.682541] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.689012] [] ? up_write+0x1a/0x60 [ 30.694266] [] mmput+0xf8/0x2d0 [ 30.699191] [] do_exit+0x8d8/0x26b0 [ 30.704455] [] ? file_map_prot_check+0x193/0x310 [ 30.710836] [] ? release_task.part.17+0x1200/0x1200 [ 30.717479] [] ? SyS_mprotect+0x41e/0x640 [ 30.723251] [] ? up_write+0x1a/0x60 [ 30.728502] [] ? SyS_mprotect+0x423/0x640 [ 30.734278] [] do_group_exit+0x111/0x330 [ 30.739968] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.746439] [] SyS_exit_group+0x1d/0x20 [ 30.752061] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.758612] 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 [ 30.785368] RIP [] page_remove_rmap+0x2e/0x260 [ 30.791702] RSP [ 30.795318] CR2: ffffeafff8da8008 [ 30.798768] ---[ end trace 3b5d49179a872d3f ]--- [ 30.803496] Kernel panic - not syncing: Fatal exception [ 30.809185] Dumping ftrace buffer: [ 30.812710] (ftrace buffer empty) [ 30.816414] Kernel Offset: disabled [ 30.820016] Rebooting in 86400 seconds..