[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.679391] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.132031] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.507560] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.243804] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 26.408799] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 32.046233] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 32.140400] BUG: unable to handle kernel paging request at ffffeafff8cc0008 [ 32.147785] IP: [] page_remove_rmap+0x2e/0x260 [ 32.154035] PGD 0 [ 32.156275] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.161219] Dumping ftrace buffer: [ 32.164742] (ftrace buffer empty) [ 32.168430] Modules linked in: [ 32.171715] CPU: 1 PID: 3838 Comm: syz-executor042 Not tainted 4.4.149-gf76bdbd #82 [ 32.179489] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.188838] task: ffff8801c9e81800 task.stack: ffff8801da3b0000 [ 32.194869] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.203586] RSP: 0018:ffff8801da3b79c0 EFLAGS: 00010246 [ 32.209008] RAX: dffffc0000000000 RBX: ffffeafff8cc0000 RCX: 0000000000000000 [ 32.216258] RDX: 1ffffd5fff198001 RSI: ffffffff814bc8bf RDI: ffffeafff8cc0008 [ 32.223527] RBP: ffff8801da3b79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.230791] R10: 0000000000000001 R11: ffff8801c9e81800 R12: 0000000000000001 [ 32.238035] R13: 1ffff1003b476f3e R14: ffff8801cc299800 R15: ffffeafff8cc0000 [ 32.245282] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.253496] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.259356] CR2: ffffeafff8cc0008 CR3: 00000001ce293000 CR4: 00000000001606f0 [ 32.266604] Stack: [ 32.268734] ffff8801da3b7c50 0000000000000001 ffff8801da3b7a78 ffffffff8150a443 [ 32.276753] 00003ffe330001e0 00003ffe330001e0 0000000041b58ab3 ffffffff841ef837 [ 32.284751] ffffffff8150a240 00000000000004f0 ffff8801cb099aa8 ffff8801da3b7a40 [ 32.292784] Call Trace: [ 32.295352] [] zap_huge_pmd+0x203/0x510 [ 32.300969] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.307541] [] unmap_single_vma+0xea3/0x1240 [ 32.313579] [] ? vm_normal_page+0x230/0x230 [ 32.319541] [] ? __put_single_page+0x60/0x60 [ 32.325599] [] unmap_vmas+0x81/0xd0 [ 32.330869] [] exit_mmap+0x1c9/0x3a0 [ 32.336257] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.342744] [] ? up_write+0x1a/0x60 [ 32.347999] [] mmput+0xf8/0x2d0 [ 32.352902] [] do_exit+0x8d8/0x26b0 [ 32.358172] [] ? file_map_prot_check+0x193/0x310 [ 32.364554] [] ? release_task.part.17+0x1200/0x1200 [ 32.371210] [] ? SyS_mprotect+0x41e/0x640 [ 32.376985] [] ? up_write+0x1a/0x60 [ 32.382239] [] ? SyS_mprotect+0x423/0x640 [ 32.388014] [] do_group_exit+0x111/0x330 [ 32.393701] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.400167] [] SyS_exit_group+0x1d/0x20 [ 32.405769] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.412317] 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 [ 32.439320] RIP [] page_remove_rmap+0x2e/0x260 [ 32.445677] RSP [ 32.449290] CR2: ffffeafff8cc0008 [ 32.452740] ---[ end trace 9a11fe4203a37402 ]--- [ 32.457473] Kernel panic - not syncing: Fatal exception [ 32.463120] Dumping ftrace buffer: [ 32.466647] (ftrace buffer empty) [ 32.470334] Kernel Offset: disabled [ 32.473935] Rebooting in 86400 seconds..