[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.988515] 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: [ 44.707328] random: sshd: uninitialized urandom read (32 bytes read, 47 bits of entropy available) [ 45.003363] random: sshd: uninitialized urandom read (32 bytes read, 47 bits of entropy available) [ 45.740924] random: sshd: uninitialized urandom read (32 bytes read, 84 bits of entropy available) [ 45.915303] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 51.430996] random: sshd: uninitialized urandom read (32 bytes read, 93 bits of entropy available) executing program [ 51.519546] BUG: unable to handle kernel paging request at ffffeafff8cf0008 [ 51.526927] IP: [] page_remove_rmap+0x2e/0x260 [ 51.533188] PGD 0 [ 51.535435] Oops: 0000 [#1] PREEMPT SMP KASAN [ 51.540410] Dumping ftrace buffer: [ 51.543927] (ftrace buffer empty) [ 51.547629] Modules linked in: [ 51.550931] CPU: 0 PID: 3746 Comm: syz-executor095 Not tainted 4.4.150-g5541782 #83 [ 51.558727] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.568063] task: ffff8801cdfd3000 task.stack: ffff8801cfcb0000 [ 51.574097] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 51.582789] RSP: 0018:ffff8801cfcb79c0 EFLAGS: 00010246 [ 51.588212] RAX: dffffc0000000000 RBX: ffffeafff8cf0000 RCX: 0000000000000000 [ 51.595479] RDX: 1ffffd5fff19e001 RSI: ffffffff814bceaf RDI: ffffeafff8cf0008 [ 51.602727] RBP: ffff8801cfcb79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 51.609977] R10: 0000000000000001 R11: ffff8801cdfd3000 R12: 0000000000000001 [ 51.617225] R13: 1ffff10039f96f3e R14: ffff8801d3919800 R15: ffffeafff8cf0000 [ 51.624479] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 51.632693] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.638553] CR2: ffffeafff8cf0008 CR3: 00000001cd2ab000 CR4: 00000000001606f0 [ 51.645818] Stack: [ 51.647943] ffff8801cfcb7c50 0000000000000001 ffff8801cfcb7a78 ffffffff8150ad13 [ 51.655984] 00003ffe33c001e0 00003ffe33c001e0 0000000041b58ab3 ffffffff841ef837 [ 51.664174] ffffffff8150ab10 00000000000004f0 ffff8800b2bdbf20 ffff8801cfcb7a40 [ 51.672204] Call Trace: [ 51.674773] [] zap_huge_pmd+0x203/0x510 [ 51.680389] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 51.686949] [] unmap_single_vma+0xea3/0x1240 [ 51.692988] [] ? vm_normal_page+0x280/0x280 [ 51.698960] [] ? __put_single_page+0x60/0x60 [ 51.704998] [] unmap_vmas+0x81/0xd0 [ 51.710444] [] exit_mmap+0x1c9/0x3a0 [ 51.715788] [] ? SyS_remap_file_pages+0x870/0x870 [ 51.722268] [] ? up_write+0x1a/0x60 [ 51.727532] [] mmput+0xf8/0x2d0 [ 51.732441] [] do_exit+0x8d8/0x26b0 [ 51.737701] [] ? file_map_prot_check+0x193/0x310 [ 51.744088] [] ? release_task.part.17+0x1200/0x1200 [ 51.750736] [] ? SyS_mprotect+0x41e/0x640 [ 51.756520] [] ? up_write+0x1a/0x60 [ 51.761778] [] ? SyS_mprotect+0x423/0x640 [ 51.767554] [] do_group_exit+0x111/0x330 [ 51.774761] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 51.781235] [] SyS_exit_group+0x1d/0x20 [ 51.786847] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 51.793595] 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 [ 51.823052] RIP [] page_remove_rmap+0x2e/0x260 [ 51.829404] RSP [ 51.833039] CR2: ffffeafff8cf0008 [ 51.836471] ---[ end trace 6b921ec88fc86121 ]--- [ 51.841218] Kernel panic - not syncing: Fatal exception [ 51.846916] Dumping ftrace buffer: [ 51.850441] (ftrace buffer empty) [ 51.854229] Kernel Offset: disabled [ 51.857838] Rebooting in 86400 seconds..