[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.708414] 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: [ 30.316329] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 30.668129] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.298824] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) [ 42.425712] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 47.960089] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) executing program [ 48.062627] BUG: unable to handle kernel paging request at ffffeafffd3c8008 [ 48.070053] IP: [] page_remove_rmap+0x2e/0x260 [ 48.076300] PGD 0 [ 48.078541] Oops: 0000 [#1] PREEMPT SMP KASAN [ 48.083537] Dumping ftrace buffer: [ 48.087063] (ftrace buffer empty) [ 48.090761] Modules linked in: [ 48.094049] CPU: 0 PID: 3696 Comm: syz-executor122 Not tainted 4.4.148-gf057ff9 #81 [ 48.101819] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.111150] task: ffff8800b2a36000 task.stack: ffff8800b2790000 [ 48.117177] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 48.125860] RSP: 0018:ffff8800b27979c0 EFLAGS: 00010246 [ 48.131285] RAX: dffffc0000000000 RBX: ffffeafffd3c8000 RCX: 0000000000000000 [ 48.138529] RDX: 1ffffd5fffa79001 RSI: ffffffff814bc75f RDI: ffffeafffd3c8008 [ 48.145884] RBP: ffff8800b27979d0 R08: ffffffff85333170 R09: 0000000000000000 [ 48.153130] R10: 0000000000000001 R11: ffff8800b2a36000 R12: 0000000000000001 [ 48.160378] R13: 1ffff100164f2f3e R14: ffff8800b28a5800 R15: ffffeafffd3c8000 [ 48.167642] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 48.175844] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.181711] CR2: ffffeafffd3c8008 CR3: 00000000b4862000 CR4: 00000000001606f0 [ 48.188959] Stack: [ 48.191083] ffff8800b2797c50 0000000000000001 ffff8800b2797a78 ffffffff8150a1f3 [ 48.199149] 00003fff4f2001e0 00003fff4f2001e0 0000000041b58ab3 ffffffff841ef82f [ 48.207162] ffffffff81509ff0 00000000000004f0 ffff8800b2fe59f8 ffff8800b2797a40 [ 48.215151] Call Trace: [ 48.217716] [] zap_huge_pmd+0x203/0x510 [ 48.223321] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 48.229896] [] unmap_single_vma+0xea3/0x1240 [ 48.235936] [] ? vm_normal_page+0x230/0x230 [ 48.241882] [] ? __put_single_page+0x60/0x60 [ 48.247919] [] unmap_vmas+0x81/0xd0 [ 48.253169] [] exit_mmap+0x1c9/0x3a0 [ 48.258513] [] ? SyS_remap_file_pages+0x870/0x870 [ 48.264985] [] ? up_write+0x1a/0x60 [ 48.270236] [] mmput+0xf8/0x2d0 [ 48.275145] [] do_exit+0x8d8/0x26b0 [ 48.280415] [] ? file_map_prot_check+0x193/0x310 [ 48.286808] [] ? release_task.part.17+0x1200/0x1200 [ 48.293475] [] ? SyS_mprotect+0x41e/0x640 [ 48.299246] [] ? up_write+0x1a/0x60 [ 48.304494] [] ? SyS_mprotect+0x423/0x640 [ 48.310266] [] do_group_exit+0x111/0x330 [ 48.315949] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 48.322417] [] SyS_exit_group+0x1d/0x20 [ 48.328093] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 48.334647] 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 [ 48.362035] RIP [] page_remove_rmap+0x2e/0x260 [ 48.368361] RSP [ 48.371957] CR2: ffffeafffd3c8008 [ 48.375389] ---[ end trace 0ba1a16cdae775e2 ]--- [ 48.380114] Kernel panic - not syncing: Fatal exception [ 48.385767] Dumping ftrace buffer: [ 48.389354] (ftrace buffer empty) [ 48.393047] Kernel Offset: disabled [ 48.396651] Rebooting in 86400 seconds..