Comments (8)
thockin
commented on September 25, 2024
It keeps happening - any clues on how to debug it would be helpful.
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aarzilli
commented on September 25, 2024
Are you hitting ^Z while the program you are debugging is running or at delve's prompt?
If you look at the output of ps what does it say about dlv?
Can you use delve to attach to the stuck dlv process and see what it's doing?
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thockin
commented on September 25, 2024
^Z while in dlv
ps auxw | grep dlv
thockin 3468313 1.5 0.1 6322216 83956 pts/0 Tl+ 15:07 0:00 dlv debug ./staging/src/k8s.io/code-generator/cmd/defaulter-gen -- --v 5 --logtostderr -h hack/boilerplate/boilerplate.generatego.txt -O zz_generated.defaults -i ./cmd/kubeadm/app/apis/kubeadm/v1beta3 -i ./cmd/kubeadm/app/apis/kubeadm/v1beta4 -i ./pkg/apis/abac/v1beta1 -i ./pkg/apis/admission/v1
$ dlv attach 3468313
Could not attach to pid 3468313: this could be caused by a kernel security setting, try writing "0" to /proc/sys/kernel/yama/ptrace_scope
sudo ~thockin/go/bin/dlv attach 3468313
Type 'help' for list of commands.
(dlv) grs
Goroutine 1 - User: /home/thockin/go/pkg/mod/github.com/go-delve/[email protected]/input.go:140 github.com/go-delve/liner.(*State).readNext (0x9537be) [select]
Goroutine 2 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [force gc (idle) 1631637529423568]
Goroutine 3 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [GC sweep wait]
Goroutine 4 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [GC scavenge wait]
Goroutine 5 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [finalizer wait 1631637529423568]
Goroutine 6 - User: /home/thockin/go/pkg/mod/github.com/go-delve/[email protected]/pkg/proc/native/proc.go:400 github.com/go-delve/delve/pkg/proc/native.(*ptraceThread).handlePtraceFuncs (0x892457) [chan receive]
Goroutine 7 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [debug call]
Goroutine 13 - User: /home/thockin/sdk/gotip/src/net/pipe.go:159 net.(*pipe).read (0x565a35) [select]
Goroutine 15 - User: /home/thockin/sdk/gotip/src/runtime/internal/syscall/syscall_linux.go:38 syscall.RawSyscall6 (0x407ced) (thread 3468317)
Goroutine 18 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [debug call]
Goroutine 19 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [debug call]
Goroutine 20 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [debug call]
Goroutine 21 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [select 1631637748260353]
Goroutine 34 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [debug call]
Goroutine 35 - User: /home/thockin/sdk/gotip/src/runtime/proc.go:403 runtime.gopark (0x44090e) [debug call]
Goroutine 51 - User: /home/thockin/sdk/gotip/src/net/pipe.go:159 net.(*pipe).read (0x565a35) [select]
Goroutine 53 - User: /home/thockin/sdk/gotip/src/runtime/sigqueue.go:152 os/signal.signal_recv (0x46f929) (thread 3468319)
Goroutine 55 - User: /home/thockin/go/pkg/mod/github.com/go-delve/[email protected]/pkg/terminal/terminal.go:186 github.com/go-delve/delve/pkg/terminal.(*Term).sigintGuard (0x99f4bd) [chan receive 1631637748260353]
[18 goroutines]
Here's my config, in case it matters:
(dlv) config -list
aliases map[display:[disp] down:[do] help:[?]]
substitute-path []
max-string-len 256
max-array-values 4
max-variable-recurse 2
disassemble-flavor <not defined>
show-location-expr false
source-list-line-color "\x1b[0;33m"
source-list-arrow-color "\x1b[1;36m"
source-list-keyword-color "\x1b[0;34m"
source-list-string-color "\x1b[0;35m"
source-list-number-color "\x1b[0;32m"
source-list-comment-color "\x1b[0;36m"
source-list-tab-color "\x1b[2;37m"
source-list-line-count 10
debug-info-directories [/usr/lib/debug/.build-id]
position ""
tab "... "
trace-show-timestamp false
It seems to happen 100% now for me, but when I sud dlv attach'ed I could ^Z ok.
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aarzilli
commented on September 25, 2024
The 'T' status looks fine, it means dlv did suspend in response to the signal. What's not good is the '+', at that point the shell should take over the terminal. What's the environment here: shell, terminal, any terminal multiplexes involved, ssh, is any of this being started by a script?
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thockin
commented on September 25, 2024
It is a local terminal, no SSH but it IS being started by a script. That is
an excellent observation. Let me try to eliminate that (exec).
…On Mon, Dec 25, 2023, 11:01 PM Alessandro Arzilli ***@***.***> wrote:
The 'T' status looks fine, it means dlv did suspend in response to the
signal. What's not good is the '+', at that point the shell should take
over the terminal. What's the environment here: shell, terminal, any
terminal multiplexes involved, ssh, is any of this being started by a
script?
—
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thockin
commented on September 25, 2024
hah, that does seem to trigger it. I admit I don't know enough about how the terminal SHOULD react to say if this is right or not. I tested by putting vi in a script and ^Zing that works how I would expect (the whole shell suspends).
$ cat vi.sh
#!/bin/sh
echo before
vi "$@"
echo after
$ echo $SHLVL
1
$ sh vi.sh /tmp/a
before
<vi loaded, I hit ^Z>
[1]+ Stopped sh vi.sh /tmp/a
$ echo $SHLVL
1
$ fg
<vi reloaded, I exited>
sh vi.sh /tmp/a
after
Is that a fair analog? I think so but not 100% sure.
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aarzilli
commented on September 25, 2024
We're sending SIGTSTP to ourselves when we should be sending it to our process group. The workaround for this should be to have an actual exec in the script (exec dlv debug ...)
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thockin
commented on September 25, 2024
Yes, exec fixes the problem for now. Thanks for digging in.
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