Bug 26896
| Summary: | Kernel panic during ktrace (vrele: negative ref cnt) | ||
|---|---|---|---|
| Product: | Base System | Reporter: | jfh <jfh> |
| Component: | kern | Assignee: | freebsd-bugs (Nobody) <bugs> |
| Status: | Closed FIXED | ||
| Severity: | Affects Only Me | ||
| Priority: | Normal | ||
| Version: | 4.3-STABLE | ||
| Hardware: | Any | ||
| OS: | Any | ||
State Changed From-To: open->closed Duplicate of 26878 State Changed From-To: closed->open Last close was bogus; even though the error message is the same, it seems to be a different problem. State Changed From-To: open->closed kern_ktrace 1.57 sounds like it fixes this problem: Fix ktrace enablement/disablement races that can result in a vnode ref count panic. Bug noticed by: ps Reviewed by: ps MFC after: 1 day If somehow this can still be reproduced, the PR can be reopened. |
Panic immediately after running "ktrace -C" to end a "ktrace -id -p <pid>" process. From the dump: (kgdb) where #0 dumpsys () at /usr/src/sys/kern/kern_shutdown.c:469 #1 0xc019d0d7 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:309 #2 0xc019d46d in panic (fmt=0xc03448dc "vrele: negative ref cnt") at /usr/src/sys/kern/kern_shutdown.c:556 #3 0xc01c9356 in vrele (vp=0xd2a37c80) at /usr/src/sys/kern/vfs_subr.c:1452 #4 0xc01975dd in ktrops (curp=0xd1f1aa00, p=0xd29912a0, ops=1, facs=254, vp=0x0) at /usr/src/sys/kern/kern_ktrace.c:411 #5 0xc019761a in ktrsetchildren (curp=0xd1f1aa00, top=0xd1f1de00, ops=1, facs=254, vp=0x0) at /usr/src/sys/kern/kern_ktrace.c:431 #6 0xc019742e in ktrace (curp=0xd1f1aa00, uap=0xd2962f80) at /usr/src/sys/kern/kern_ktrace.c:330 #7 0xc03042a9 in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = -1077938544, tf_esi = 1, tf_ebp = -1077938636, tf_isp = -761909292, tf_ebx = 1, tf_edx = -2012235704, tf_ecx = 11, tf_eax = 45, tf_trapno = 12, tf_err = 2, tf_eip = -2012608448, tf_cs = 31, tf_eflags = 582, tf_esp = -1077938808, tf_ss = 47}) at /usr/src/sys/i386/i386/trap.c:1150 #8 0xc02f5a45 in Xint0x80_syscall () #9 0x80487e5 in ?? () This is the second panic in vrele due to negative ref cnts in as many days at my site. kernel and dump are available if anyone needs them. Fix: Unknown How-To-Repeat: Unknown