Date: Thu, 11 Jun 2026 13:17:34 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 296001] hwpmc: panic: [amd,526] pmc6,cpu15: Starting active PMC "K8-L3-0" Message-ID: <bug-296001-227@https.bugs.freebsd.org/bugzilla/>
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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: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org 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 -- You are receiving this mail because: You are the assignee for the bug.home | help
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