[Bug 255289] panic: mmc: host bridge didn't serialize us

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255289

Henri Hennebert <hlh@restart.be> changed:

           What    |Removed                     |Added
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                 CC|                            |hlh@restart.be

--- Comment #3 from Henri Hennebert <hlh@restart.be> ---
FreeBSD keystone.lab.bel 13.0-STABLE FreeBSD 13.0-STABLE #0
stable/13-n248012-b6b91760300b: Sun Nov  7 20:36:15 CET 2021    
root@keystone.lab.bel:/usr/obj/usr/src/arm64.aarch64/sys/ROCKPRO64  arm64

on a rockpro64

While running
/usr/sbin/watchdogd -s 30 -e /sbin/zpool import -w --softtimeout
--softtimeout-action printf,log -t 128 -x 256

When `make -s buildworld`, I get:

panic: mmc: host bridge didn't serialize us.
cpuid = 3
time = 1636356673
KDB: stack backtrace:
#0 0xffff0000003f50bc at kdb_backtrace+0x60
#1 0xffff00000039fb8c at vpanic+0x184
#2 0xffff00000039fa04 at panic+0x44
#3 0xffff000000190e3c at mmc_acquire_bus+0x5c4
#4 0xffff0000001997d0 at mmcsd_flush_cache+0x6c
#5 0xffff000000197f34 at mmcsd_close+0x20
#6 0xffff0000002ee354 at g_disk_access+0xd8
#7 0xffff0000002f4c3c at g_access+0x1c8
#8 0xffff0000002ebf7c at g_dev_close+0x284
#9 0xffff00000023d5d8 at devfs_close+0x810
#10 0xffff000000824738 at VOP_CLOSE_APV+0x2c
#11 0xffff0000004aa188 at vn_close1+0x170
#12 0xffff0000004a84c4 at vn_closefile+0x3c
#13 0xffff00000023e1bc at devfs_close_f+0x28
#14 0xffff000000330964 at _fdrop+0x18
#15 0xffff000000334d00 at closef+0x30c
#16 0xffff000000330db0 at closefp+0xa0
#17 0xffff0000007cd7b4 at do_el0_sync+0x6a0
Uptime: 18m51s
(da0:umass-sim0:0:0:0): Synchronize cache failed
Dumping 451 out of 3910 MB:Aborting dump due to I/O error.

If I run without watchdogd, `make -s buildworld` complete without problem...
:-O

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