[Bug 217214] frequent panics in tcp_output/sbsndptr

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217214

--- Comment #2 from G. Paul Ziemba <p-fbsd-bugs at ziemba.us> ---
(In reply to Hiren Panchasara from comment #1)

Thank you for your input. Yes, I am running VirtualBox, but just to be clear,
the panics are occurring on the host system, not the guest.

I have rebuilt the kernel with INVARIANTS in hopes of obtaining additional
info, but will also see about trying some older versions as you suggest.

It's not entirely clear to me that the reboot loop with the non -O2 kernel is
panicinn at the same place. I'm also seeing some startup time panics at line
760 of /usr/src/sys/ufs/ufs/ufs_lookup.c (ufs_dirbad: /v2: bad dir ino
270866706 at offset 1024: mangled entry) in the -O2 kernel. I speculate these
could be the result of a prior crash leaving the filesystem in an improper
state.

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