[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.389617] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.475552] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.888973] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.652105] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) [ 34.923373] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. [ 40.428891] random: sshd: uninitialized urandom read (32 bytes read, 91 bits of entropy available) executing program [ 40.528018] BUG: unable to handle kernel paging request at ffffeafff8e28008 [ 40.535371] IP: [] page_remove_rmap+0x2e/0x260 [ 40.541619] PGD 0 [ 40.543870] Oops: 0000 [#1] PREEMPT SMP KASAN [ 40.549004] Dumping ftrace buffer: [ 40.552518] (ftrace buffer empty) [ 40.556203] Modules linked in: [ 40.559519] CPU: 0 PID: 3841 Comm: syz-executor638 Not tainted 4.4.149-gf76bdbd #82 [ 40.567291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.576618] task: ffff8801d9308000 task.stack: ffff8801d9260000 [ 40.582650] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 40.591383] RSP: 0018:ffff8801d92679c0 EFLAGS: 00010246 [ 40.596803] RAX: dffffc0000000000 RBX: ffffeafff8e28000 RCX: 0000000000000000 [ 40.604049] RDX: 1ffffd5fff1c5001 RSI: ffffffff814bc8bf RDI: ffffeafff8e28008 [ 40.611299] RBP: ffff8801d92679d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 40.618561] R10: 0000000000000001 R11: ffff8801d9308000 R12: 0000000000000001 [ 40.625814] R13: 1ffff1003b24cf3e R14: ffff8801d9b73800 R15: ffffeafff8e28000 [ 40.633065] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 40.641275] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.647134] CR2: ffffeafff8e28008 CR3: 00000001d001c000 CR4: 00000000001606f0 [ 40.654380] Stack: [ 40.656509] ffff8801d9267c50 0000000000000001 ffff8801d9267a78 ffffffff8150a443 [ 40.664555] 00003ffe38a001e0 00003ffe38a001e0 0000000041b58ab3 ffffffff841ef837 [ 40.672563] ffffffff8150a240 00000000000004f0 ffff8801d913f478 ffff8801d9267a40 [ 40.680554] Call Trace: [ 40.683131] [] zap_huge_pmd+0x203/0x510 [ 40.688735] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 40.695288] [] unmap_single_vma+0xea3/0x1240 [ 40.701327] [] ? vm_normal_page+0x230/0x230 [ 40.707277] [] ? __put_single_page+0x60/0x60 [ 40.713309] [] unmap_vmas+0x81/0xd0 [ 40.718567] [] exit_mmap+0x1c9/0x3a0 [ 40.723909] [] ? SyS_remap_file_pages+0x870/0x870 [ 40.730377] [] ? up_write+0x1a/0x60 [ 40.735630] [] mmput+0xf8/0x2d0 [ 40.740538] [] do_exit+0x8d8/0x26b0 [ 40.745795] [] ? file_map_prot_check+0x193/0x310 [ 40.752233] [] ? release_task.part.17+0x1200/0x1200 [ 40.758882] [] ? SyS_mprotect+0x41e/0x640 [ 40.764658] [] ? up_write+0x1a/0x60 [ 40.769914] [] ? SyS_mprotect+0x423/0x640 [ 40.775698] [] do_group_exit+0x111/0x330 [ 40.781382] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 40.787847] [] SyS_exit_group+0x1d/0x20 [ 40.793449] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 40.799999] 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 [ 40.827090] RIP [] page_remove_rmap+0x2e/0x260 [ 40.833427] RSP [ 40.837024] CR2: ffffeafff8e28008 [ 40.840452] ---[ end trace a82506f8af6ce57d ]--- [ 40.845178] Kernel panic - not syncing: Fatal exception [ 40.850849] Dumping ftrace buffer: [ 40.854373] (ftrace buffer empty) [ 40.858058] Kernel Offset: disabled [ 40.861659] Rebooting in 86400 seconds..