Date: Fri, 20 Jul 2001 11:51:51 -0700 (PDT) From: Matthew Jacob <mjacob@feral.com> To: smp@freebsd.org Subject: total confusion... Message-ID: <Pine.BSF.4.21.0107201148331.88617-100000@beppo>
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I thought that by default Giant is held in calls through specfs to devices.
I still got a panic as in:
sa2:isp2:0:4:0): Retrying Command
panic: mutex Giant not owned at ../../../dev/isp/isp_freebsd.c:1753
cpuid = 0; panic
Stopped at Debugger+0x34: zapnot v0,#0xf,a0 <v0=0x0,a0=0x6>
db> t
Debugger() at Debugger+0x34
panic() at panic+0x178
_mtx_assert() at _mtx_assert+0x64
isp_action() at isp_action+0x140
xpt_run_dev_sendq() at xpt_run_dev_sendq+0x2e8
xpt_action() at xpt_action+0x460
cam_periph_runccb() at cam_periph_runccb+0x70
sawritefilemarks() at sawritefilemarks+0xe0
sacheckeod() at sacheckeod+0x30
saclose() at saclose+0x204
spec_close() at spec_close+0x10c
spec_vnoperate() at spec_vnoperate+0x2c
vn_close() at vn_close+0x60
vn_closefile() at vn_closefile+0x30
fdrop() at fdrop+0xf8
closef() at closef+0xbc
fdfree() at fdfree+0x74
exit1() at exit1+0x874
sigexit() at sigexit+0x450
postsig() at postsig+0x174
userret() at userret+0x1a8
syscall() at syscall+0x7e0
XentSys() at XentSys+0x64
--- syscall (5, FreeBSD ELF, open) ---
The line in question is:
ccb->ccb_h.sim_priv.entries[0].field = 0;
ccb->ccb_h.sim_priv.entries[1].ptr = isp;
if (isp->isp_state != ISP_RUNSTATE &&
ccb->ccb_h.func_code == XPT_SCSI_IO) {
>>> CAMLOCK_2_ISPLOCK(isp);
isp_init(isp);
where it releases Giant and grabs the ISP lock (which also
is *wierd* because this codew shouldn't have been entered
anyway at this time).
So, I'm sorely confused at the very least.
At any rate- if anyone has a notion, let me know. I'm off to Sacramento
for the rest of the day, so I'll return to this tomorrow.
-matt
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