[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.429356] 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: [ 26.096252] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 26.539754] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 27.178557] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) [ 27.363566] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) Warning: Permanently added '10.128.0.49' (ECDSA) to the list of known hosts. [ 33.054781] random: sshd: uninitialized urandom read (32 bytes read, 66 bits of entropy available) executing program [ 33.149497] BUG: unable to handle kernel paging request at ffffeafff8d58008 [ 33.156846] IP: [] page_remove_rmap+0x2e/0x260 [ 33.163094] PGD 0 [ 33.165348] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.170346] Dumping ftrace buffer: [ 33.173863] (ftrace buffer empty) [ 33.177556] Modules linked in: [ 33.180845] CPU: 0 PID: 3764 Comm: syz-executor184 Not tainted 4.4.148-gf057ff9 #81 [ 33.188614] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.197950] task: ffff8801cc0f4800 task.stack: ffff8801cb4b0000 [ 33.203985] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.212684] RSP: 0018:ffff8801cb4b79c0 EFLAGS: 00010246 [ 33.218109] RAX: dffffc0000000000 RBX: ffffeafff8d58000 RCX: ffffea00072a0000 [ 33.225409] RDX: 1ffffd5fff1ab001 RSI: ffffffff814bc75f RDI: ffffeafff8d58008 [ 33.232711] RBP: ffff8801cb4b79d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.239970] R10: 0000000000000001 R11: ffff8801cc0f4800 R12: 0000000000000001 [ 33.247226] R13: 1ffff10039696f3e R14: ffff8801cf6c2810 R15: ffffeafff8d58000 [ 33.254476] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.262743] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.268608] CR2: ffffeafff8d58008 CR3: 00000001cf6ca000 CR4: 00000000001606f0 [ 33.275862] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.283110] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.290358] Stack: [ 33.292491] ffff8801cb4b7c50 0000000000000001 ffff8801cb4b7a78 ffffffff8150a1f3 [ 33.300511] 00003ffe356001a0 00003ffe356001a0 0000000041b58ab3 ffffffff841ef82f [ 33.308523] ffffffff81509ff0 00000000000004f0 ffff8801ce864c60 ffff8801cb4b7a40 [ 33.316544] Call Trace: [ 33.319114] [] zap_huge_pmd+0x203/0x510 [ 33.324725] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.331287] [] unmap_single_vma+0xea3/0x1240 [ 33.337329] [] ? vm_normal_page+0x230/0x230 [ 33.343284] [] ? __put_single_page+0x60/0x60 [ 33.349411] [] unmap_vmas+0x81/0xd0 [ 33.354669] [] exit_mmap+0x1c9/0x3a0 [ 33.360036] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.366521] [] ? up_write+0x1a/0x60 [ 33.371783] [] mmput+0xf8/0x2d0 [ 33.376721] [] do_exit+0x8d8/0x26b0 [ 33.382030] [] ? file_map_prot_check+0x193/0x310 [ 33.388421] [] ? release_task.part.17+0x1200/0x1200 [ 33.395069] [] ? SyS_mprotect+0x41e/0x640 [ 33.400850] [] ? up_write+0x1a/0x60 [ 33.406112] [] ? SyS_mprotect+0x423/0x640 [ 33.411892] [] do_group_exit+0x111/0x330 [ 33.417590] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.424065] [] SyS_exit_group+0x1d/0x20 [ 33.429678] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.436261] 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 [ 33.463816] RIP [] page_remove_rmap+0x2e/0x260 [ 33.470177] RSP [ 33.473785] CR2: ffffeafff8d58008 [ 33.477223] ---[ end trace 6a8344350a97561e ]--- [ 33.481963] Kernel panic - not syncing: Fatal exception [ 33.487812] Dumping ftrace buffer: [ 33.491342] (ftrace buffer empty) [ 33.495042] Kernel Offset: disabled [ 33.498650] Rebooting in 86400 seconds..