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panic: Unknown syscall 85 error: link should be resolved via Readlink()

Status: fixed on 2019/07/12 01:21
Reported-by: syzbot+6f9fcebd2aee0563a530@syzkaller.appspotmail.com
Fix commit: 6db3f8d54c02 Don't mask errors in createAt loop.
First crash: 1972d, last: 1967d

Sample crash report:
panic: Unknown syscall 85 error: link should be resolved via Readlink()

goroutine 230 [running]:
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).ExtractErrno(0xc0009b4a80, 0xe92420, 0xc00011e7e0, 0x55, 0x0)
	pkg/sentry/kernel/task_syscall.go:446 +0x364
DIAGNOSIS:
retrieving stacks: getting sandbox "ci-gvisor-kvm-direct-sandbox-1" stacks: urpc method "debug.Stacks" failed: connection reset by peer

Crashes (64):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/07/05 04:01 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-kvm-direct-sandbox
2019/07/05 03:48 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-kvm-direct-sandbox
2019/07/05 01:09 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-kvm-proxy-overlay-sandbox
2019/07/05 00:52 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-kvm-proxy-overlay-sandbox
2019/07/04 21:30 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-ptrace-proxy-sandbox-race
2019/07/04 21:17 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-ptrace-proxy-sandbox-race
2019/07/04 20:49 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-ptrace-direct-overlay-host
2019/07/04 20:46 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-main
2019/07/04 20:41 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-kvm-direct-overlay-host-race
2019/07/04 20:36 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-ptrace-direct-overlay-host
2019/07/04 20:33 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-main
2019/07/04 20:06 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report syz ci-gvisor-kvm-direct-overlay-host-race
2019/07/04 12:21 https://gvisor.googlesource.com/gvisor master 67f2cefce028 55565fa0 .config console log report syz ci-gvisor-ptrace-proxy-sandbox-race
2019/07/04 12:21 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report syz ci-gvisor-main
2019/07/04 12:20 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report syz ci-gvisor-ptrace-direct-overlay-host
2019/07/04 12:07 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report syz ci-gvisor-kvm-direct-overlay-host-race
2019/07/04 09:41 https://gvisor.googlesource.com/gvisor master 67f2cefce028 55565fa0 .config console log report syz ci-gvisor-ptrace-proxy-sandbox-race
2019/07/04 09:41 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report syz ci-gvisor-main
2019/07/04 09:41 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report syz ci-gvisor-ptrace-direct-overlay-host
2019/07/04 09:28 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report syz ci-gvisor-kvm-direct-overlay-host-race
2019/07/08 18:43 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/08 15:58 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-direct-overlay-host
2019/07/08 14:38 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-direct-overlay-host
2019/07/08 13:28 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/08 08:32 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-direct-overlay-host
2019/07/08 02:38 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/08 01:26 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-main
2019/07/07 23:23 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/07 21:22 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/07 20:21 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/07 19:07 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/07 15:16 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-main
2019/07/07 15:03 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-direct-overlay-host
2019/07/07 12:31 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/07 11:08 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/07 08:01 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/07 07:36 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-main
2019/07/07 07:04 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-direct-overlay-host
2019/07/07 03:48 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-main
2019/07/07 03:23 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/06 23:01 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-main
2019/07/06 22:50 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-direct-overlay-host
2019/07/06 22:47 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2019/07/06 22:21 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/06 21:45 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-proxy-overlay-sandbox
2019/07/06 15:55 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/06 12:43 https://gvisor.googlesource.com/gvisor master 67f2cefce028 f62e1e85 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/05 00:25 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report ci-gvisor-kvm-proxy-overlay-sandbox
2019/07/04 20:22 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report ci-gvisor-main
2019/07/04 19:22 https://gvisor.googlesource.com/gvisor master 67f2cefce028 deef5fbc .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/04 11:48 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
2019/07/04 09:09 https://gvisor.googlesource.com/gvisor master 9f2f9f0cab7a 55565fa0 .config console log report ci-gvisor-kvm-direct-overlay-host-race
* Struck through repros no longer work on HEAD.