[Bug 227465] [zfs][iscsi]repeatable panics on iSCSI target/zvol creation

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227465

Mark Linimon <***@FreeBSD.org> changed:

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--- Comment #1 from Andriy Gapon <***@FreeBSD.org> ---
Please try stable/11 after base r332095.
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--- Comment #2 from ***@norma.perm.ru ---
Got panic on r332466:

Apr 18 17:52:39 san1 kernel: vputx: usecount not zero for vnode
Apr 18 17:52:39 san1 kernel: 0xfffff80f4d7d1760: tag devfs, type VCHR
Apr 18 17:52:39 san1 kernel: usecount -1, writecount -1, refcount 0

Only these lines in the messages, no crashdump this time (although I was
getting decent crashdumps previously).

Cannot find much aboth this kind of panic, what does it mean ?
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--- Comment #3 from ***@norma.perm.ru ---
Am I right assuming that the last panic is related to the
https://svnweb.freebsd.org/base?view=revision&revision=331666 ?

(Is this PR a right place to continue the discussion ?)
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--- Comment #4 from Andriy Gapon <***@FreeBSD.org> ---
(In reply to emz from comment #3)
It's not impossible but it is not very probable.
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--- Comment #5 from ***@norma.perm.ru ---
Created https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227631 since it seems
to be another problem.
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--- Comment #6 from Andriy Gapon <***@FreeBSD.org> ---
Do you still see this issue (comment #0) ?
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--- Comment #7 from ***@norma.perm.ru ---
After switching to volmode=dev on all the pools that serve iSCSI backends - no.
Seems like this issue is more related to this option, rather than to FreeBSD
revision.
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