[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.276543] 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: [ 24.596396] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.988466] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.705184] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 25.881683] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 31.422738] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 31.514238] BUG: unable to handle kernel paging request at ffffeafff8d28008 [ 31.518271] IP: [] page_remove_rmap+0x2e/0x260 [ 31.518287] PGD 0 [ 31.518295] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.518300] Dumping ftrace buffer: [ 31.518304] (ftrace buffer empty) [ 31.518308] Modules linked in: [ 31.518315] CPU: 0 PID: 3742 Comm: syz-executor799 Not tainted 4.4.150-g5541782 #83 [ 31.518319] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.518323] task: ffff8801d079e000 task.stack: ffff8801ccb28000 [ 31.518334] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.518339] RSP: 0018:ffff8801ccb2f9c0 EFLAGS: 00010246 [ 31.518343] RAX: dffffc0000000000 RBX: ffffeafff8d28000 RCX: 0000000000000000 [ 31.518348] RDX: 1ffffd5fff1a5001 RSI: ffffffff814bceaf RDI: ffffeafff8d28008 [ 31.518352] RBP: ffff8801ccb2f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.518356] R10: 0000000000000001 R11: ffff8801d079e000 R12: 0000000000000001 [ 31.518361] R13: 1ffff10039965f3e R14: ffff8801d123b800 R15: ffffeafff8d28000 [ 31.518369] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.518374] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.518378] CR2: ffffeafff8d28008 CR3: 00000001d1238000 CR4: 00000000001606f0 [ 31.518390] Stack: [ 31.518399] ffff8801ccb2fc50 0000000000000001 ffff8801ccb2fa78 ffffffff8150ad13 [ 31.518408] 00003ffe34a001e0 00003ffe34a001e0 0000000041b58ab3 ffffffff841ef837 [ 31.518416] ffffffff8150ab10 00000000000004f0 ffff8801cc85f318 ffff8801ccb2fa40 [ 31.518418] Call Trace: [ 31.518428] [] zap_huge_pmd+0x203/0x510 [ 31.518437] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.518444] [] unmap_single_vma+0xea3/0x1240 [ 31.518452] [] ? vm_normal_page+0x280/0x280 [ 31.518461] [] ? __put_single_page+0x60/0x60 [ 31.518468] [] unmap_vmas+0x81/0xd0 [ 31.518475] [] exit_mmap+0x1c9/0x3a0 [ 31.518483] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.518491] [] ? kmem_cache_free+0x2b4/0x340 [ 31.518499] [] mmput+0xf8/0x2d0 [ 31.518506] [] do_exit+0x8d8/0x26b0 [ 31.518515] [] ? file_map_prot_check+0x193/0x310 [ 31.518523] [] ? release_task.part.17+0x1200/0x1200 [ 31.518530] [] ? SyS_mprotect+0x41e/0x640 [ 31.518539] [] ? up_write+0x1a/0x60 [ 31.518546] [] ? SyS_mprotect+0x423/0x640 [ 31.518553] [] do_group_exit+0x111/0x330 [ 31.518561] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.518568] [] SyS_exit_group+0x1d/0x20 [ 31.518578] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.518685] 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 [ 31.518694] RIP [] page_remove_rmap+0x2e/0x260 [ 31.518696] RSP [ 31.518699] CR2: ffffeafff8d28008 [ 31.518705] ---[ end trace b4bf6b6fc605ed28 ]--- [ 31.518710] Kernel panic - not syncing: Fatal exception [ 31.521835] Dumping ftrace buffer: [ 31.521838] (ftrace buffer empty) [ 31.521840] Kernel Offset: disabled [ 31.837531] Rebooting in 86400 seconds..