https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=296001
Bug ID: 296001
Summary: hwpmc: panic: [amd,526] pmc6,cpu15: Starting active
PMC "K8-L3-0"
Product: Base System
Version: 16.0-CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
I get this cryptic panic whenever I try to start hwpmc to measure l3_misses on
my AMD Ryzen system. I can instantly reproduce it.
Environment
===========
FreeBSD 16.0-CURRENT at c289291a673 (main branch as of 9-June-2026)
AMD Ryzen 9 5950X 16-Core Processor
Steps to Reproduce
==================
sudo kldload hwpmc
sudo -E pmcstat -P l3_misses -d -O /tmp/cache_misses.log cargo build
Stack Trace
===========
#0 __curthread ()
at
/usr/home/somers/src/freebsd.org/src/main/sys/amd64/include/pcpu_aux.h:57
#1 doadump (textdump=textdump@entry=0)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_shutdown.c:399
#2 0xffffffff804c665a in db_dump (dummy=<optimized out>,
dummy2=<optimized out>, dummy3=<optimized out>, dummy4=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_command.c:596
#3 0xffffffff804c650a in db_command (last_cmdp=<optimized out>,
cmd_table=<optimized out>, dopager=true)
at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_command.c:508
#4 0xffffffff804c612d in db_command_loop ()
at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_command.c:555
#5 0xffffffff804c9d60 in db_trap (type=<optimized out>, code=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/ddb/db_main.c:267
#6 0xffffffff80c5ba2f in kdb_trap (type=type@entry=3, code=code@entry=0,
tf=tf@entry=0xfffffe0165dcc6b0)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_kdb.c:790
#7 0xffffffff8118e3c8 in trap (frame=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/amd64/amd64/trap.c:697
#8 <signal handler called>
#9 kdb_enter (why=<optimized out>, msg=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_kdb.c:556
#10 0xffffffff80c05be9 in vpanic (fmt=<optimized out>,
ap=ap@entry=0xfffffe0165dcc8e0)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_shutdown.c:962
#11 0xffffffff80c05a63 in panic (
fmt=0xffffffff81da2270 <cnputs_mtx> "8\020(\201\377\377\377\377")
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_shutdown.c:887
#12 0xffffffff83866802 in amd_start_pmc (cpu=15, ri=6, pm=0xfffff8000d3da300)
at /usr/home/somers/src/freebsd.org/src/main/sys/dev/hwpmc/hwpmc_amd.c:525
#13 0xffffffff8385c059 in pmc_process_csw_in (td=0xfffff80031581780)
at /usr/home/somers/src/freebsd.org/src/main/sys/dev/hwpmc/hwpmc_mod.c:1585
#14 pmc_hook_handler (td=0xfffff80031581780, function=<optimized out>,
arg=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/dev/hwpmc/hwpmc_mod.c:2171
#15 0xffffffff80c3e039 in sched_ule_sswitch (td=0xfffff80031581780,
flags=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/sched_ule.c:2415
#16 0xffffffff80c12f82 in mi_switch (flags=flags@entry=259)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_synch.c:526
#17 0xffffffff80c6f049 in sleepq_switch (wchan=wchan@entry=0xfffff80034b4e780,
pri=pri@entry=0)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_sleepqueue.c:608
#18 0xffffffff80c6f426 in sleepq_catch_signals (wchan=0xfffff80034b4e780,
pri=0)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_sleepqueue.c:523
#19 0xffffffff80c6f179 in sleepq_wait_sig (
wchan=0xffffffff81da2270 <cnputs_mtx>, pri=1708967472)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/subr_sleepqueue.c:671
#20 0xffffffff80c12497 in _sleep (ident=ident@entry=0xfffff80034b4e780,
lock=lock@entry=0xffffffff81de9740 <umtxq_chains+15840>,
priority=priority@entry=768,
wmesg=wmesg@entry=0xffffffff8131b9be "urdlck", sbt=sbt@entry=0,
pr=pr@entry=0, flags=0)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_synch.c:220
#21 0xffffffff80c28952 in umtxq_sleep (uq=uq@entry=0xfffff80034b4e780,
wmesg=0xffffffff8131b9be "urdlck", timo=timo@entry=0x0)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:843
#22 0xffffffff80c3288a in do_rw_rdlock (td=0xfffff80031581780,
rwlock=0x33d86e023b00, fflag=<optimized out>, timeout=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:3217
#23 0xffffffff80c2ae79 in kern__umtx_op (td=0xffffffff81da2270 <cnputs_mtx>,
obj=<optimized out>, val=18, uaddr1=0x0, uaddr2=<optimized out>,
ops=0xffffffff813b3e80, op=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:4994
#24 sys__umtx_op (td=0xffffffff81da2270 <cnputs_mtx>, uap=<optimized out>)
at /usr/home/somers/src/freebsd.org/src/main/sys/kern/kern_umtx.c:5019
#25 0xffffffff8118f269 in syscallenter (td=0xfffff80031581780)
at
/usr/home/somers/src/freebsd.org/src/main/sys/amd64/amd64/../../kern/subr_syscall.c:193
#26 amd64_syscall (td=0xfffff80031581780, traced=0)
at /usr/home/somers/src/freebsd.org/src/main/sys/amd64/amd64/trap.c:1257
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