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In the current implementation, the isp_kthread() threads never exit.
The target threads do have an exit mode from isp_attach(), but it is
not invoked from isp_detach().
Ensure isp_detach() notifies threads started for each channel, such
that they exit before their parent device softc detaches, and thus
before the module does. Otherwise, a page fault panic occurs later in:
sysctl_kern_proc
sysctl_out_proc
kern_proc_out
fill_kinfo_proc
fill_kinfo_thread
strlcpy(kp->ki_wmesg, td->td_wmesg, sizeof(kp->ki_wmesg));
For isp_kthread() (and isp(4) target threads), td->td_wmesg references
now-unmapped memory after the module has been unloaded. These threads
are typically msleep()ing at the time of unload, but they could also
attempt to execute now-unmapped code segments.
MFC after: 1 month
Sponsored by: Spectra Logic
MFSpectraBSD: r1070921 on 2014/06/22 13:01:17
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|---|---|---|
| .. | ||
| DriverManual.txt | ||
| Hardware.txt | ||
| isp.c | ||
| isp_freebsd.c | ||
| isp_freebsd.h | ||
| isp_ioctl.h | ||
| isp_library.c | ||
| isp_library.h | ||
| isp_pci.c | ||
| isp_sbus.c | ||
| isp_stds.h | ||
| isp_target.c | ||
| isp_target.h | ||
| ispmbox.h | ||
| ispreg.h | ||
| ispvar.h | ||