[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.362210] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 22.596848] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.927898] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.594186] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 23.767016] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. [ 29.289658] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 29.379427] BUG: unable to handle kernel paging request at ffffeafff8ca8008 [ 29.386811] IP: [] page_remove_rmap+0x2e/0x260 [ 29.393075] PGD 0 [ 29.395317] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.400290] Dumping ftrace buffer: [ 29.403803] (ftrace buffer empty) [ 29.407488] Modules linked in: [ 29.410775] CPU: 0 PID: 3839 Comm: syz-executor596 Not tainted 4.4.148-gf057ff9 #81 [ 29.418547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.427880] task: ffff8801d9516000 task.stack: ffff8801d9318000 [ 29.433916] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.442599] RSP: 0018:ffff8801d931f9c0 EFLAGS: 00010246 [ 29.448024] RAX: dffffc0000000000 RBX: ffffeafff8ca8000 RCX: 0000000000000000 [ 29.455268] RDX: 1ffffd5fff195001 RSI: ffffffff814bc75f RDI: ffffeafff8ca8008 [ 29.462511] RBP: ffff8801d931f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.469756] R10: 0000000000000001 R11: ffff8801d9516000 R12: 0000000000000001 [ 29.477002] R13: 1ffff1003b263f3e R14: ffff8801cc465800 R15: ffffeafff8ca8000 [ 29.484266] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.492484] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.498340] CR2: ffffeafff8ca8008 CR3: 00000001cc5e8000 CR4: 00000000001606f0 [ 29.505587] Stack: [ 29.507709] ffff8801d931fc50 0000000000000001 ffff8801d931fa78 ffffffff8150a1f3 [ 29.515700] 00003ffe32a001e0 00003ffe32a001e0 0000000041b58ab3 ffffffff841ef82f [ 29.523686] ffffffff81509ff0 00000000000004f0 ffff8801cc7cdb58 ffff8801d931fa40 [ 29.531678] Call Trace: [ 29.534245] [] zap_huge_pmd+0x203/0x510 [ 29.539853] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.546412] [] unmap_single_vma+0xea3/0x1240 [ 29.552443] [] ? vm_normal_page+0x230/0x230 [ 29.558392] [] ? __put_single_page+0x60/0x60 [ 29.564422] [] unmap_vmas+0x81/0xd0 [ 29.569676] [] exit_mmap+0x1c9/0x3a0 [ 29.575011] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.581479] [] ? up_write+0x1a/0x60 [ 29.586731] [] mmput+0xf8/0x2d0 [ 29.591637] [] do_exit+0x8d8/0x26b0 [ 29.596889] [] ? file_map_prot_check+0x193/0x310 [ 29.603284] [] ? release_task.part.17+0x1200/0x1200 [ 29.609925] [] ? SyS_mprotect+0x41e/0x640 [ 29.615697] [] ? up_write+0x1a/0x60 [ 29.620950] [] ? SyS_mprotect+0x423/0x640 [ 29.626722] [] do_group_exit+0x111/0x330 [ 29.632414] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.638881] [] SyS_exit_group+0x1d/0x20 [ 29.644482] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.651031] 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 [ 29.678119] RIP [] page_remove_rmap+0x2e/0x260 [ 29.684474] RSP [ 29.688074] CR2: ffffeafff8ca8008 [ 29.691504] ---[ end trace ebd1d2d402b80a9c ]--- [ 29.696253] Kernel panic - not syncing: Fatal exception [ 29.701915] Dumping ftrace buffer: [ 29.705447] (ftrace buffer empty) [ 29.709133] Kernel Offset: disabled [ 29.712735] Rebooting in 86400 seconds..