[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.675994] 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: [ 25.859478] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.264885] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.919417] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) [ 27.087165] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.0.62' (ECDSA) to the list of known hosts. [ 32.626345] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 32.715732] BUG: unable to handle kernel paging request at ffffeafffd3f8008 [ 32.723079] IP: [] page_remove_rmap+0x2e/0x260 [ 32.729320] PGD 0 [ 32.731576] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.736511] Dumping ftrace buffer: [ 32.740033] (ftrace buffer empty) [ 32.743729] Modules linked in: [ 32.747059] CPU: 0 PID: 3723 Comm: syz-executor527 Not tainted 4.4.149-gf76bdbd #82 [ 32.754824] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.764151] task: ffff8801cd0bc800 task.stack: ffff8801cd700000 [ 32.770180] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.778879] RSP: 0018:ffff8801cd7079c0 EFLAGS: 00010246 [ 32.784316] RAX: dffffc0000000000 RBX: ffffeafffd3f8000 RCX: 0000000000000000 [ 32.791559] RDX: 1ffffd5fffa7f001 RSI: ffffffff814bc8bf RDI: ffffeafffd3f8008 [ 32.798803] RBP: ffff8801cd7079d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.806057] R10: 0000000000000001 R11: ffff8801cd0bc800 R12: 0000000000000001 [ 32.813302] R13: 1ffff10039ae0f3e R14: ffff8800b5252800 R15: ffffeafffd3f8000 [ 32.820551] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.828781] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.834641] CR2: ffffeafffd3f8008 CR3: 00000000b1d72000 CR4: 00000000001606f0 [ 32.841900] Stack: [ 32.844023] ffff8801cd707c50 0000000000000001 ffff8801cd707a78 ffffffff8150a443 [ 32.852011] 00003fff4fe001e0 00003fff4fe001e0 0000000041b58ab3 ffffffff841ef837 [ 32.860000] ffffffff8150a240 00000000000004f0 ffff8801cdc03630 ffff8801cd707a40 [ 32.867974] Call Trace: [ 32.870537] [] zap_huge_pmd+0x203/0x510 [ 32.876165] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.882722] [] unmap_single_vma+0xea3/0x1240 [ 32.888753] [] ? vm_normal_page+0x230/0x230 [ 32.894697] [] ? __put_single_page+0x60/0x60 [ 32.900726] [] unmap_vmas+0x81/0xd0 [ 32.905976] [] exit_mmap+0x1c9/0x3a0 [ 32.911310] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.917787] [] ? up_write+0x1a/0x60 [ 32.923039] [] mmput+0xf8/0x2d0 [ 32.927944] [] do_exit+0x8d8/0x26b0 [ 32.933225] [] ? file_map_prot_check+0x193/0x310 [ 32.939603] [] ? release_task.part.17+0x1200/0x1200 [ 32.946241] [] ? SyS_mprotect+0x41e/0x640 [ 32.952045] [] ? up_write+0x1a/0x60 [ 32.957294] [] ? SyS_mprotect+0x423/0x640 [ 32.963075] [] do_group_exit+0x111/0x330 [ 32.968770] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.975247] [] SyS_exit_group+0x1d/0x20 [ 32.980859] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.987421] 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 [ 33.014465] RIP [] page_remove_rmap+0x2e/0x260 [ 33.020787] RSP [ 33.024383] CR2: ffffeafffd3f8008 [ 33.027808] ---[ end trace 137b449681a33edd ]--- [ 33.032534] Kernel panic - not syncing: Fatal exception [ 33.038282] Dumping ftrace buffer: [ 33.041804] (ftrace buffer empty) [ 33.045488] Kernel Offset: disabled [ 33.049088] Rebooting in 86400 seconds..