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Date:      Fri, 12 Feb 2021 09:00:27 +0000
From:      bugzilla-noreply@freebsd.org
To:        fs@FreeBSD.org
Subject:   [Bug 253158] Panic: snapacct_ufs2: bad block - Non-suJ mksnap_ffs(8) crash
Message-ID:  <bug-253158-3630-vMeSDf7ZMu@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-253158-3630@https.bugs.freebsd.org/bugzilla/>
References:  <bug-253158-3630@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D253158

--- Comment #9 from Harald Schmalzbauer <bugzilla.freebsd@omnilan.de> ---
Thank you very much for further analysis and fix.
Unfortunately, this seems to introduce a new problem:

/sbin/mksnap_ffs /.snap/.test2

/usr/sbin/fstyp /.snap/.test2

Repdiducable panic:
Fatal trap 12: page fault while in kernel mode
current process: fstyp

  #7 ... uiomove_fromphys+
 #8 ... vn_io_fault_uiomove+
 #9 ... ffs_read+
#10 ... VOP_READ_APV+
#11 ... vn_read+
#12 ... vn_io_doio+
#13 ... vn_io_fault1+
#14 ... vn_io_fault+
#15 ... dofileread+
#16 ... sys_read+
#17 ... amd64_syscall+

Unfortunately I can't test on debug environment currently, the crash happens
with produtcion deployment tests without serial console, su just trinscribe=
d a
stacktrace snippet.

Thanks,
-harry

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