Hi, On Thu, Nov 7, 2013 at 9:53 AM, Axel Lin <axel....@ingics.com> wrote: > Hi, > I got below oops while debugging a sd controller driver: > > [ 4.032026] ------------[ cut here ]------------ > [ 4.036730] kernel BUG at kernel/kallsyms.c:222! > [ 4.041501] Internal error: Oops - BUG: 0 [#1] ARM > [ 4.046847] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted > 3.12.0-00061-g0835d93-dirty #1657 > > I can avoid the oops by either revert commit f6537f2f0eba4eba > "scripts/kallsyms: filter symbols not in kernel address space", > or comment out below line in drivers/mmc/core/sdio.c. > dev_dbg(&card->dev, "calling %pF\n", f->vendor_fixup); > > The f->vendor_fixup points to add_quirk_for_sdio_devices. > It looks like the symbol add_quirk_for_sdio_devices is missing. > > So I revert commit f6537f2f and check /proc/kallsyms: > ~ # grep add_quirk_for_sdio_devices /proc/kallsyms > 00157bf8 t add_quirk_for_sdio_devices > > If I don't revert commit f6537f2f and just comment out above dev_dbg line, > Checking /proc/kallsyms then I got: > ~ # grep add_quirk_for_sdio_devices /proc/kallsyms > [sched_delayed] sched: RT throttling activated > BUG: soft lockup - CPU#0 stuck for 21s! [grep:59] > > CPU: 0 PID: 59 Comm: grep Not tainted 3.12.0-00061-g0835d93-dirty #1675 > task: 01d36320 ti: 008be000 task.ti: 008be000 > > BTW, I'm testing it on a noMMU platform (arm7tdmi).
Could you share what is the value of CONFIG_PAGE_OFFSET on your noMMU platform? Thanks, -- Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/