[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.880056] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.689011] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 27.043582] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.737194] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) [ 27.904926] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 33.458534] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) executing program [ 33.549294] BUG: unable to handle kernel paging request at ffffeafffd2e0008 [ 33.556646] IP: [] page_remove_rmap+0x2e/0x260 [ 33.562918] PGD 0 [ 33.565157] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.570106] Dumping ftrace buffer: [ 33.573617] (ftrace buffer empty) [ 33.577304] Modules linked in: [ 33.580588] CPU: 0 PID: 3779 Comm: syz-executor646 Not tainted 4.4.149-gf76bdbd #18 [ 33.588358] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.597689] task: ffff8801cb6bb000 task.stack: ffff8800af658000 [ 33.603716] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.612398] RSP: 0018:ffff8800af65f948 EFLAGS: 00010246 [ 33.617819] RAX: dffffc0000000000 RBX: ffffeafffd2e0000 RCX: 0000000000000000 [ 33.625063] RDX: 1ffffd5fffa5c001 RSI: ffffffff814bc8bf RDI: ffffeafffd2e0008 [ 33.632306] RBP: ffff8800af65f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.639551] R10: 0000000000000001 R11: ffff8801cb6bb000 R12: 0000000000000001 [ 33.646795] R13: 1ffff10015ecbf2f R14: ffff8800af511800 R15: ffffeafffd2e0000 [ 33.654038] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.662237] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.668093] CR2: ffffeafffd2e0008 CR3: 00000000aff09000 CR4: 00000000001606f0 [ 33.675339] Stack: [ 33.677495] ffff8800af65fbd8 0000000000000001 ffff8800af65fa00 ffffffff8150a443 [ 33.685473] 00003fff4b8001e0 00003fff4b8001e0 0000000041b58ab3 ffffffff841ef837 [ 33.693451] ffffffff8150a240 00000000000004f0 ffff8800afda6108 ffff8800af65f9c8 [ 33.701432] Call Trace: [ 33.703998] [] zap_huge_pmd+0x203/0x510 [ 33.709601] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.716155] [] unmap_single_vma+0xea3/0x1240 [ 33.722188] [] ? vm_normal_page+0x230/0x230 [ 33.728136] [] ? __put_single_page+0x60/0x60 [ 33.734166] [] unmap_vmas+0x81/0xd0 [ 33.739419] [] exit_mmap+0x1c9/0x3a0 [ 33.744777] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.751249] [] ? up_write+0x1a/0x60 [ 33.756500] [] mmput+0xf8/0x2d0 [ 33.761426] [] do_exit+0x8d8/0x26b0 [ 33.766681] [] ? file_map_prot_check+0x193/0x310 [ 33.773080] [] ? release_task.part.17+0x1200/0x1200 [ 33.779722] [] ? SyS_mprotect+0x41e/0x640 [ 33.785492] [] ? up_write+0x1a/0x60 [ 33.790760] [] ? SyS_mprotect+0x423/0x640 [ 33.796538] [] do_group_exit+0x111/0x330 [ 33.802223] [] ? do_group_exit+0x330/0x330 [ 33.808082] [] SyS_exit_group+0x1d/0x20 [ 33.813680] [] do_fast_syscall_32+0x324/0x8b0 [ 33.819829] [] sysenter_flags_fixed+0xd/0x1a [ 33.825874] 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 [ 33.853835] RIP [] page_remove_rmap+0x2e/0x260 [ 33.860165] RSP [ 33.863762] CR2: ffffeafffd2e0008 [ 33.867188] ---[ end trace 3331e052bb82db05 ]--- [ 33.871914] Kernel panic - not syncing: Fatal exception [ 33.877544] Dumping ftrace buffer: [ 33.881065] (ftrace buffer empty) [ 33.884746] Kernel Offset: disabled [ 33.888351] Rebooting in 86400 seconds..