[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.328193] 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: [ 24.429879] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 24.797546] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 25.482158] random: sshd: uninitialized urandom read (32 bytes read, 62 bits of entropy available) [ 25.652253] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. [ 31.399699] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 31.489684] BUG: unable to handle kernel paging request at ffffeafffd3f0008 [ 31.497046] IP: [] page_remove_rmap+0x2e/0x260 [ 31.503292] PGD 0 [ 31.505532] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.510508] Dumping ftrace buffer: [ 31.514030] (ftrace buffer empty) [ 31.517719] Modules linked in: [ 31.521007] CPU: 0 PID: 3783 Comm: syz-executor707 Not tainted 4.4.150-g5541782 #19 [ 31.528779] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.538116] task: ffff8800af069800 task.stack: ffff8800bb998000 [ 31.544149] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.552830] RSP: 0018:ffff8800bb99f948 EFLAGS: 00010246 [ 31.558254] RAX: dffffc0000000000 RBX: ffffeafffd3f0000 RCX: 0000000000000000 [ 31.565513] RDX: 1ffffd5fffa7e001 RSI: ffffffff814bceaf RDI: ffffeafffd3f0008 [ 31.572760] RBP: ffff8800bb99f958 R08: ffffffff85333170 R09: 0000000000000000 [ 31.580005] R10: 0000000000000001 R11: ffff8800af069800 R12: 0000000000000001 [ 31.587285] R13: 1ffff10017733f2f R14: ffff8800b320c800 R15: ffffeafffd3f0000 [ 31.594531] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.602731] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.608587] CR2: ffffeafffd3f0008 CR3: 00000000b4af1000 CR4: 00000000001606f0 [ 31.615834] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 31.623079] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 31.630327] Stack: [ 31.632450] ffff8800bb99fbd8 0000000000000001 ffff8800bb99fa00 ffffffff8150ad13 [ 31.640477] 00003fff4fc001e0 00003fff4fc001e0 0000000041b58ab3 ffffffff841ef837 [ 31.648478] ffffffff8150ab10 00000000000004f0 ffff8801caf7d790 ffff8800bb99f9c8 [ 31.656528] Call Trace: [ 31.659100] [] zap_huge_pmd+0x203/0x510 [ 31.664703] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.671271] [] unmap_single_vma+0xea3/0x1240 [ 31.677321] [] ? vm_normal_page+0x280/0x280 [ 31.683273] [] ? __put_single_page+0x60/0x60 [ 31.689311] [] unmap_vmas+0x81/0xd0 [ 31.694568] [] exit_mmap+0x1c9/0x3a0 [ 31.699911] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.706396] [] ? up_write+0x1a/0x60 [ 31.711684] [] mmput+0xf8/0x2d0 [ 31.716611] [] do_exit+0x8d8/0x26b0 [ 31.721873] [] ? file_map_prot_check+0x193/0x310 [ 31.728262] [] ? release_task.part.17+0x1200/0x1200 [ 31.734911] [] ? SyS_mprotect+0x41e/0x640 [ 31.740692] [] ? up_write+0x1a/0x60 [ 31.745946] [] ? SyS_mprotect+0x423/0x640 [ 31.751724] [] do_group_exit+0x111/0x330 [ 31.757414] [] ? do_group_exit+0x330/0x330 [ 31.763276] [] SyS_exit_group+0x1d/0x20 [ 31.768904] [] do_fast_syscall_32+0x324/0x8b0 [ 31.775066] [] sysenter_flags_fixed+0xd/0x1a [ 31.781121] 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 [ 31.807936] RIP [] page_remove_rmap+0x2e/0x260 [ 31.814274] RSP [ 31.817877] CR2: ffffeafffd3f0008 [ 31.821310] ---[ end trace ad956208524f2411 ]--- [ 31.826071] Kernel panic - not syncing: Fatal exception [ 31.831802] Dumping ftrace buffer: [ 31.835323] (ftrace buffer empty) [ 31.839010] Kernel Offset: disabled [ 31.842625] Rebooting in 86400 seconds..