[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.837819] 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: [ 23.579014] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.959951] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.579064] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 24.764920] random: sshd: uninitialized urandom read (32 bytes read, 57 bits of entropy available) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 30.437256] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) executing program [ 30.530052] BUG: unable to handle kernel paging request at ffffeafff8ca0008 [ 30.537432] IP: [] page_remove_rmap+0x2e/0x260 [ 30.543682] PGD 0 [ 30.545917] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.550866] Dumping ftrace buffer: [ 30.554378] (ftrace buffer empty) [ 30.558060] Modules linked in: [ 30.561358] CPU: 0 PID: 3705 Comm: syz-executor283 Not tainted 4.4.149-gf76bdbd #82 [ 30.569120] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.578455] task: ffff8801cee31800 task.stack: ffff8801d2680000 [ 30.584483] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.593184] RSP: 0018:ffff8801d26879c0 EFLAGS: 00010246 [ 30.598628] RAX: dffffc0000000000 RBX: ffffeafff8ca0000 RCX: 0000000000000000 [ 30.605898] RDX: 1ffffd5fff194001 RSI: ffffffff814bc8bf RDI: ffffeafff8ca0008 [ 30.613155] RBP: ffff8801d26879d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.620398] R10: 0000000000000001 R11: ffff8801cee31800 R12: 0000000000000001 [ 30.627641] R13: 1ffff1003a4d0f3e R14: ffff8801ce048800 R15: ffffeafff8ca0000 [ 30.634884] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.643107] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.648979] CR2: ffffeafff8ca0008 CR3: 00000001d1e45000 CR4: 00000000001606f0 [ 30.656224] Stack: [ 30.658364] ffff8801d2687c50 0000000000000001 ffff8801d2687a78 ffffffff8150a443 [ 30.666360] 00003ffe328001e0 00003ffe328001e0 0000000041b58ab3 ffffffff841ef837 [ 30.674345] ffffffff8150a240 00000000000004f0 ffff8800b2a5eaa8 ffff8801d2687a40 [ 30.682365] Call Trace: [ 30.684929] [] zap_huge_pmd+0x203/0x510 [ 30.690529] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.697097] [] unmap_single_vma+0xea3/0x1240 [ 30.703137] [] ? vm_normal_page+0x230/0x230 [ 30.709082] [] ? __put_single_page+0x60/0x60 [ 30.715140] [] unmap_vmas+0x81/0xd0 [ 30.720393] [] exit_mmap+0x1c9/0x3a0 [ 30.725731] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.732199] [] ? up_write+0x1a/0x60 [ 30.737463] [] mmput+0xf8/0x2d0 [ 30.742371] [] do_exit+0x8d8/0x26b0 [ 30.747626] [] ? file_map_prot_check+0x193/0x310 [ 30.754004] [] ? release_task.part.17+0x1200/0x1200 [ 30.760645] [] ? SyS_mprotect+0x41e/0x640 [ 30.766695] [] ? up_write+0x1a/0x60 [ 30.771950] [] ? SyS_mprotect+0x423/0x640 [ 30.777776] [] do_group_exit+0x111/0x330 [ 30.783466] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.789930] [] SyS_exit_group+0x1d/0x20 [ 30.795531] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.802077] 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 [ 30.828932] RIP [] page_remove_rmap+0x2e/0x260 [ 30.835262] RSP [ 30.838860] CR2: ffffeafff8ca0008 [ 30.842287] ---[ end trace 81d464e27f5c39cb ]--- [ 30.847016] Kernel panic - not syncing: Fatal exception [ 30.852677] Dumping ftrace buffer: [ 30.856218] (ftrace buffer empty) [ 30.859904] Kernel Offset: disabled [ 30.863507] Rebooting in 86400 seconds..