[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.419258] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.955641] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.379366] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.133246] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 26.308053] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.54' (ECDSA) to the list of known hosts. [ 31.922559] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 32.010768] BUG: unable to handle kernel paging request at ffffeafffd460008 [ 32.018241] IP: [] page_remove_rmap+0x2e/0x260 [ 32.024487] PGD 0 [ 32.026729] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.031696] Dumping ftrace buffer: [ 32.035211] (ftrace buffer empty) [ 32.038896] Modules linked in: [ 32.042189] CPU: 0 PID: 3787 Comm: syz-executor382 Not tainted 4.4.148-gf057ff9 #81 [ 32.049955] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.059343] task: ffff8800afde6000 task.stack: ffff8800af3f8000 [ 32.065380] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.074060] RSP: 0018:ffff8800af3ff9c0 EFLAGS: 00010246 [ 32.079484] RAX: dffffc0000000000 RBX: ffffeafffd460000 RCX: 0000000000000000 [ 32.086787] RDX: 1ffffd5fffa8c001 RSI: ffffffff814bc75f RDI: ffffeafffd460008 [ 32.094043] RBP: ffff8800af3ff9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.101299] R10: 0000000000000001 R11: ffff8800afde6000 R12: 0000000000000001 [ 32.108551] R13: 1ffff10015e7ff3e R14: ffff8800b2eb5800 R15: ffffeafffd460000 [ 32.115804] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.124022] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.129887] CR2: ffffeafffd460008 CR3: 00000000b2c2b000 CR4: 00000000001606f0 [ 32.137143] Stack: [ 32.139282] ffff8800af3ffc50 0000000000000001 ffff8800af3ffa78 ffffffff8150a1f3 [ 32.147326] 00003fff518001e0 00003fff518001e0 0000000041b58ab3 ffffffff841ef82f [ 32.155352] ffffffff81509ff0 00000000000004f0 ffff8800af726d68 ffff8800af3ffa40 [ 32.163349] Call Trace: [ 32.165920] [] zap_huge_pmd+0x203/0x510 [ 32.171530] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.178092] [] unmap_single_vma+0xea3/0x1240 [ 32.184132] [] ? vm_normal_page+0x230/0x230 [ 32.190085] [] ? __put_single_page+0x60/0x60 [ 32.196122] [] unmap_vmas+0x81/0xd0 [ 32.201377] [] exit_mmap+0x1c9/0x3a0 [ 32.206759] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.213240] [] ? up_write+0x1a/0x60 [ 32.218499] [] mmput+0xf8/0x2d0 [ 32.223414] [] do_exit+0x8d8/0x26b0 [ 32.228679] [] ? file_map_prot_check+0x193/0x310 [ 32.235102] [] ? release_task.part.17+0x1200/0x1200 [ 32.241791] [] ? SyS_mprotect+0x41e/0x640 [ 32.247582] [] ? up_write+0x1a/0x60 [ 32.252841] [] ? SyS_mprotect+0x423/0x640 [ 32.258629] [] do_group_exit+0x111/0x330 [ 32.264338] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 32.270828] [] SyS_exit_group+0x1d/0x20 [ 32.276431] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.282986] 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 [ 32.310090] RIP [] page_remove_rmap+0x2e/0x260 [ 32.316471] RSP [ 32.320073] CR2: ffffeafffd460008 [ 32.323505] ---[ end trace 2065c0e239ef8a85 ]--- [ 32.328311] Kernel panic - not syncing: Fatal exception [ 32.333983] Dumping ftrace buffer: [ 32.337506] (ftrace buffer empty) [ 32.341193] Kernel Offset: disabled [ 32.344791] Rebooting in 86400 seconds..