https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254177
Bug ID: 254177
Summary: When ZFS is recognized, An i386 machine with a lot of
memory hangs.
Product: Base System
Version: 13.0-STABLE
Hardware: i386
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: bugs at FreeBSD.org
Reporter: btrenchd at yahoo.co.jp
When ZFS is recognized, An i386 machine with a lot of memory hangs on FreeBSD
13.0-RC1 (git 60e8939aa85b07f3271dcc01730727dda04c8bf6).
It occurs on line 799th of /usr/src/sys/contrib/openzfs/module/zfs/dbuf.c
while (hsize * zfs_arc_average_blocksize < physmem * PAGESIZE)
hsize <<= 1;
My machine has 24GB of memory, so `physmem' is 0x59B9AD and `PAGESIZE' is
0x1000, but `physmem * PAGESIZE' overflows to 0x9B9AD000. Then the condition
of the while statement may always be true, and this statement goes into an
eternal loop.
To fix that immediately, that line will be changed to
while (hsize * zfs_arc_average_blocksize < (uint64_t)physmem *
PAGESIZE)
or
while (hsize / PAGESIZE * zfs_arc_average_blocksize < physmem)
On the other hand, that problem comes from the type of the variable `physmem'
which is declared on line 65th of /usr/src/sys/sys/systm.h for kernel,
extern long physmem; /* physical memory */
and on line 54th of /usr/src/sys/contrib/openzfs/lib/libzpool/kernel.c for
userland.
uint64_t physmem;
That problem does not occur on amd64, because the sizeof(long) is different.
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