[Bug 253158] Panic: snapacct_ufs2: bad block - Non-suJ mksnap_ffs(8) crash

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253158

--- Comment #30 from Cy Schubert <cy at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #27)
Since building with -O0 -g, the panic now occurs in the bcopy() two statements
before the reported panic.

Again at frame 12:

(kgdb) frame 12
#12 0xffffffff8166a738 in ffs_read (ap=0xfffffe0087e5a598)
    at /opt/src/vm64/sys/ufs/ffs/ffs_vnops.c:789
789                             error = vn_io_fault_pgmove(bp->b_pages,
blkoffset,
(kgdb) p bp->b_pages[0]
Cannot access memory at address 0xfffffdfff7529e58
(kgdb) p bp->b_pages[1]
Cannot access memory at address 0xfffffdfff7529e60
(kgdb) p bp->b_pages[2]
Cannot access memory at address 0xfffffdfff7529e68
(kgdb) p bp->b_pages[3]
Cannot access memory at address 0xfffffdfff7529e70
(kgdb) p bp->b_pages[4]
Cannot access memory at address 0xfffffdfff7529e78
(kgdb) p bp->b_pages[5]
Cannot access memory at address 0xfffffdfff7529e80
(kgdb) p bp->b_pages[6]
Cannot access memory at address 0xfffffdfff7529e88
(kgdb) p bp->b_pages[7]
Cannot access memory at address 0xfffffdfff7529e90
(kgdb)

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