Connection to valgrind embedded gdb server is failing with an error "Connection reset by peer"

Question

I trying to follow the instruction on connecting to valgrind using gdb. Valgrind memcheck is starts properly and asks to connect using following gdb command:

target remote | vgdb --pid=53181

but when I run this command, I get an error

Remote communication error. Target disconnected.: Connection reset by peer

what is my mistake?

Can you try a more recent Valgrind? Current is 3.19 and I expect 3.20 will be released very soon (planned for 22 Oct 2022). — Paul Floyd, Oct 21 '22 at 12:33
I tried, it didn't work as well. I suspect it is more likely a gdb 10.2 syntax issue. — George Vinokhodov, Oct 21 '22 at 12:52
I wouldn't have thought so. Valgrind is communicating with vgdb/gdb using named pipes and the protocol seems fairly stable. Does either vgdb or valgrind say anything more useful if you add "-v -v" to them both? — Paul Floyd, Oct 21 '22 at 16:40
Just tried adding -v to both valgrind and vgdb. There is no extra messages after I type "target remote | vgdb -v". Valgrind is awaiting on message "(action on error) vgdb me ..." and nothing else. — George Vinokhodov, Oct 24 '22 at 11:15

George Vinokhodov · Accepted Answer · 2022-10-24T13:10:25.173

0

It appears that error

Remote communication error. Target disconnected.: Connection reset by peer.

is general and may indicate invalid command as well. If you run in gdb

target remote | something

it will give you the same error message.

It appeared for me, that extra space after | symbol was excess.

Correct command was actually

target remote |vgdb --pid=53181

My GDB version is GNU gdb (Ubuntu 10.2-0ubuntu1~18.04~2) 10.2

edited Oct 24 '22 at 13:10

answered Oct 20 '22 at 10:18

George Vinokhodov

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That seems very strange. I have never seen any gdb version needing or not needing a space before/after the | in the target remote command. I have just checked again with GDB 10.2 and it works with or without space. For sure, the above behaviour and answer does not apply generally. I suggest to retest your hypothesis, and if confirm, to give the exact versions of GDB build, the platform, etc ... – phd Oct 22 '22 at 13:27
Also, giving: "target remote | something" gives first a message the something is "not found". – phd Oct 22 '22 at 13:29

Connection to valgrind embedded gdb server is failing with an error "Connection reset by peer"

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