Date: Fri, 29 Oct 2021 10:02:14 +0530 From: "Kamal R. Prasad" <kamalpr@gmail.com> To: freebsd-arm <freebsd-arm@freebsd.org> Subject: bug in mmc driver Message-ID: <CAK=yUG%2Bu9K3=9yHKeabBkyKx%2B6=mGy3_cKXaJeTa75OQ%2BbTJYg@mail.gmail.com>
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hello, if i run a stress test on a freebsd system booted from a micron mmc device, and run a script which in a loop opens the same mmc device in read-only mode, it causes a problem in acquiring the bus and panics the box. both the stress test and a script to open the mmc device in read only mode are in user space and so kernel should not have panic'ed. Pl see stack trace from our freebsd derived os. thanks -kamal -------------- panic: mmc: host bridge didn't serialize us. cpuid = 2 time = 1635445326 KDB: stack backtrace: db_trace_self() at db_trace_self_wrapper+0x28 pc = 0xffff00000032d114 lr = 0xffff0000000757cc sp = 0xffff00006a09b590 fp = 0xffff00006a09b790 db_trace_self_wrapper() at kdb_backtrace+0x38 pc = 0xffff0000000757cc lr = 0xffff000000200d04 sp = 0xffff00006a09b7a0 fp = 0xffff00006a09b850 kdb_backtrace() at vpanic+0x18c pc = 0xffff000000200d04 lr = 0xffff0000001baf6c sp = 0xffff00006a09b860 fp = 0xffff00006a09b8b0 vpanic() at panic+0x44 pc = 0xffff0000001baf6c lr = 0xffff0000001bad24 sp = 0xffff00006a09b8c0 fp = 0xffff00006a09b970 panic() at mmc_acquire_bus+0x524 pc = 0xffff0000001bad24 lr = 0xffff00000008ad1c sp = 0xffff00006a09b980 fp = 0xffff00006a09b9c0 mmc_acquire_bus() at mmcsd_task+0x184 pc = 0xffff00000008ad1c lr = 0xffff000000092f54 sp = 0xffff00006a09b9d0 fp = 0xffff00006a09baf0 mmcsd_task() at fork_exit+0xb4 pc = 0xffff000000092f54 lr = 0xffff000000182460 sp = 0xffff00006a09bb00 fp = 0xffff00006a09bb60 fork_exit() at fork_trampoline+0x10 pc = 0xffff000000182460 lr = 0xffff000000349b6c sp = 0xffff00006a09bb70 fp = 0x0000000000000000 KDB: Current process: mmcsd0: mmc/sd card KDB: enter: kdb_dbbe 0xffff000001094088, kdb_active 0 KDB: enter: panic ###Entering boot mastership relinquish phase [ thread pid 35 tid 100092 ] Stopped at 0 db>
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