[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.883884] 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: [ 25.038675] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.520320] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.231386] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 26.389032] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.10.36' (ECDSA) to the list of known hosts. [ 31.896435] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) executing program [ 31.985920] BUG: unable to handle kernel paging request at ffffeafff8d30008 [ 31.993271] IP: [] page_remove_rmap+0x2e/0x260 [ 31.999516] PGD 0 [ 32.001757] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.006695] Dumping ftrace buffer: [ 32.010212] (ftrace buffer empty) [ 32.013923] Modules linked in: [ 32.017210] CPU: 0 PID: 3846 Comm: syz-executor068 Not tainted 4.4.150-g5541782 #19 [ 32.025002] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.034333] task: ffff8800ac336000 task.stack: ffff8801d2fe0000 [ 32.040361] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.049031] RSP: 0018:ffff8801d2fe7948 EFLAGS: 00010246 [ 32.054451] RAX: dffffc0000000000 RBX: ffffeafff8d30000 RCX: ffffea0002af8000 [ 32.061693] RDX: 1ffffd5fff1a6001 RSI: ffffffff814bceaf RDI: ffffeafff8d30008 [ 32.068935] RBP: ffff8801d2fe7958 R08: ffffffff85333170 R09: 0000000000000000 [ 32.076181] R10: 0000000000000001 R11: ffff8800ac336000 R12: 0000000000000001 [ 32.083430] R13: 1ffff1003a5fcf2f R14: ffff8801d0bb1800 R15: ffffeafff8d30000 [ 32.090676] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.098890] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.104760] CR2: ffffeafff8d30008 CR3: 00000001cfac3000 CR4: 00000000001606f0 [ 32.112141] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.119385] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.126627] Stack: [ 32.128750] ffff8801d2fe7bd8 0000000000000001 ffff8801d2fe7a00 ffffffff8150ad13 [ 32.136736] 00003ffe34c001e0 00003ffe34c001e0 0000000041b58ab3 ffffffff841ef837 [ 32.144727] ffffffff8150ab10 00000000000004f0 ffff8801ce53bb58 ffff8801d2fe79c8 [ 32.152702] Call Trace: [ 32.155272] [] zap_huge_pmd+0x203/0x510 [ 32.160869] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.167423] [] unmap_single_vma+0xea3/0x1240 [ 32.173455] [] ? vm_normal_page+0x280/0x280 [ 32.179402] [] ? __put_single_page+0x60/0x60 [ 32.185435] [] unmap_vmas+0x81/0xd0 [ 32.190687] [] exit_mmap+0x1c9/0x3a0 [ 32.196025] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.202506] [] ? up_write+0x1a/0x60 [ 32.207758] [] mmput+0xf8/0x2d0 [ 32.212662] [] do_exit+0x8d8/0x26b0 [ 32.217913] [] ? file_map_prot_check+0x193/0x310 [ 32.224294] [] ? release_task.part.17+0x1200/0x1200 [ 32.230933] [] ? SyS_mprotect+0x41e/0x640 [ 32.236704] [] ? up_write+0x1a/0x60 [ 32.241955] [] ? SyS_mprotect+0x423/0x640 [ 32.247724] [] do_group_exit+0x111/0x330 [ 32.253410] [] ? do_group_exit+0x330/0x330 [ 32.259288] [] SyS_exit_group+0x1d/0x20 [ 32.264886] [] do_fast_syscall_32+0x324/0x8b0 [ 32.271006] [] sysenter_flags_fixed+0xd/0x1a [ 32.277032] 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 [ 32.303745] RIP [] page_remove_rmap+0x2e/0x260 [ 32.310088] RSP [ 32.313684] CR2: ffffeafff8d30008 [ 32.317109] ---[ end trace 0fc855df3b9ac2b7 ]--- [ 32.321833] Kernel panic - not syncing: Fatal exception [ 32.327539] Dumping ftrace buffer: [ 32.331057] (ftrace buffer empty) [ 32.334739] Kernel Offset: disabled [ 32.338339] Rebooting in 86400 seconds..