[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.861678] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.801573] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.241646] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.925559] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 27.077981] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.10.1' (ECDSA) to the list of known hosts. [ 32.634883] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 32.723759] BUG: unable to handle kernel paging request at ffffeafff8bd8008 [ 32.731133] IP: [] page_remove_rmap+0x2e/0x260 [ 32.737375] PGD 0 [ 32.739614] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.744618] Dumping ftrace buffer: [ 32.748129] (ftrace buffer empty) [ 32.751811] Modules linked in: [ 32.755099] CPU: 0 PID: 3774 Comm: syz-executor366 Not tainted 4.4.150-g5541782 #19 [ 32.762913] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.772250] task: ffff8800af809800 task.stack: ffff8801d9588000 [ 32.778389] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.787088] RSP: 0018:ffff8801d958f948 EFLAGS: 00010246 [ 32.792510] RAX: dffffc0000000000 RBX: ffffeafff8bd8000 RCX: 0000000000000000 [ 32.799842] RDX: 1ffffd5fff17b001 RSI: ffffffff814bceaf RDI: ffffeafff8bd8008 [ 32.807087] RBP: ffff8801d958f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.814332] R10: 0000000000000001 R11: ffff8800af809800 R12: 0000000000000001 [ 32.821691] R13: 1ffff1003b2b1f2f R14: ffff8801ca91f800 R15: ffffeafff8bd8000 [ 32.829003] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 32.837210] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.843073] CR2: ffffeafff8bd8008 CR3: 00000001ca9df000 CR4: 00000000001606f0 [ 32.850372] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.857625] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.864866] Stack: [ 32.866992] ffff8801d958fbd8 0000000000000001 ffff8801d958fa00 ffffffff8150ad13 [ 32.874975] 00003ffe2f6001e0 00003ffe2f6001e0 0000000041b58ab3 ffffffff841ef837 [ 32.882964] ffffffff8150ab10 00000000000004f0 ffff8801ca9f0790 ffff8801d958f9c8 [ 32.890948] Call Trace: [ 32.893513] [] zap_huge_pmd+0x203/0x510 [ 32.899122] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.905685] [] unmap_single_vma+0xea3/0x1240 [ 32.911725] [] ? vm_normal_page+0x280/0x280 [ 32.917678] [] ? __put_single_page+0x60/0x60 [ 32.923718] [] unmap_vmas+0x81/0xd0 [ 32.928978] [] exit_mmap+0x1c9/0x3a0 [ 32.934319] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.940791] [] ? up_write+0x1a/0x60 [ 32.946090] [] mmput+0xf8/0x2d0 [ 32.951004] [] do_exit+0x8d8/0x26b0 [ 32.956263] [] ? file_map_prot_check+0x193/0x310 [ 32.962652] [] ? release_task.part.17+0x1200/0x1200 [ 32.969413] [] ? SyS_mprotect+0x41e/0x640 [ 32.975191] [] ? up_write+0x1a/0x60 [ 32.980447] [] ? SyS_mprotect+0x423/0x640 [ 32.986223] [] do_group_exit+0x111/0x330 [ 32.991911] [] ? do_group_exit+0x330/0x330 [ 32.997780] [] SyS_exit_group+0x1d/0x20 [ 33.003384] [] do_fast_syscall_32+0x324/0x8b0 [ 33.009509] [] sysenter_flags_fixed+0xd/0x1a [ 33.015555] 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 [ 33.042423] RIP [] page_remove_rmap+0x2e/0x260 [ 33.048755] RSP [ 33.052357] CR2: ffffeafff8bd8008 [ 33.055791] ---[ end trace 4e63b24fccc260f8 ]--- [ 33.060521] Kernel panic - not syncing: Fatal exception [ 33.066215] Dumping ftrace buffer: [ 33.069737] (ftrace buffer empty) [ 33.073420] Kernel Offset: disabled [ 33.077025] Rebooting in 86400 seconds..