So I'm trying to get the kernel to drop into ddb when it spews witness
stuff.. stuff like:
Aug 18 23:22:28 blarf kernel: ../../../vm/uma_core.c:1332: could sleep with "process
lock" locked from ../../../kern/kern_exec.c:360
Aug 18 23:22:28 blarf last message repeated 2 times
Aug 18 23:28:12 blarf kernel: ../../../vm/uma_core.c:1332: could sleep with "process
lock" locked from ../../../kern/kern_exec.c:360
Aug 18 23:28:12 blarf last message repeated 2 times
Aug 18 23:44:09 blarf kernel: ../../../vm/uma_core.c:1332: could sleep with "process
lock" locked from ../../../kern/kern_exec.c:360
Aug 18 23:44:09 blarf last message repeated 2 times
So I set debug.witness_ddb to 1. I see the above when I exit from X. No
ddb. Hmm. I go into the debugger manually and get a useless trace (duh).
Some more head scratching while world builds, then I get this:
../../../kern/kern_synch.c:454: sleeping with "mntvnode" locked from
../../../kern/vfs_subr.c:2789
panic: from debugger
cpuid = 0; lapic.id = 00000000
-------
GNU gdb 5.2.0 (FreeBSD) 20020627
This GDB was configured as "i386-undermydesk-freebsd"...
panic: bremfree: bp 0xc424acdc not locked
panic messages:
---
panic: from debugger
cpuid = 0; lapic.id = 00000000
syncing disks... panic: bremfree: bp 0xc424acdc not locked
cpuid = 0; lapic.id = 00000000
Uptime: 22h19m59s
Dumping 127 MB
ata0: resetting devices ..
done
16 32 48 64 80 96 112
---
#0 doadump () at ../../../kern/kern_shutdown.c:213
213 dumping++;
(kgdb) bt
#0 doadump () at ../../../kern/kern_shutdown.c:213
#1 0xc02216b1 in boot (howto=260) at ../../../kern/kern_shutdown.c:345
#2 0xc02218d3 in panic () at ../../../kern/kern_shutdown.c:493
#3 0xc0255f71 in bremfree (bp=0xc424acdc) at ../../../kern/vfs_bio.c:633
#4 0xc02576e6 in vfs_bio_awrite (bp=0xc424acdc)
at ../../../kern/vfs_bio.c:1627
#5 0xc01fafdc in spec_fsync (ap=0xc9c17814)
at ../../../fs/specfs/spec_vnops.c:406
#6 0xc01faba7 in spec_vnoperate (ap=0x0)
at ../../../fs/specfs/spec_vnops.c:124
#7 0xc02e12a2 in ffs_sync (mp=0xc1b09a00, waitfor=2, cred=0xc0bace80,
td=0xc03eda40) at vnode_if.h:545
#8 0xc0265860 in sync (td=0xc03eda40, uap=0x0)
at ../../../kern/vfs_syscalls.c:129
#9 0xc022131e in boot (howto=256) at ../../../kern/kern_shutdown.c:254
#10 0xc02218d3 in panic () at ../../../kern/kern_shutdown.c:493
#11 0xc016d1ed in db_panic () at ../../../ddb/db_command.c:449
#12 0xc016d18c in db_command (last_cmdp=0xc03c4440, cmd_table=0x0,
aux_cmd_tablep=0xc03bb4f0, aux_cmd_tablep_end=0xc03bb4f4)
at ../../../ddb/db_command.c:345
#13 0xc016d25b in db_command_loop () at ../../../ddb/db_command.c:471
#14 0xc016f692 in db_trap (type=3, code=0) at ../../../ddb/db_trap.c:72
#15 0xc03257a8 in kdb_trap (type=3, code=0, regs=0xc9c17a28)
at ../../../i386/i386/db_interface.c:161
#16 0xc0339fcc in trap (frame=
{tf_fs = -1071448040, tf_es = -1070006256, tf_ds = 16, tf_edi = 1, tf_esi = 0,
tf_ebp = -910067092, tf_isp = -910067116, tf_ebx = 0, tf_edx = 0, tf_ecx = 0, tf_eax =
26, tf_trapno = 3, tf_err = 0, tf_eip = -1070441902, tf_cs = 8, tf_eflags = 642,
tf_esp = -1, tf_ss = -910067060}) at ../../../i386/i386/trap.c:605
#17 0xc0326bc8 in calltrap () at /var/tmp//ccTCRbXy.s:99
#18 0xc023bb23 in witness_sleep (check_only=0, lock=0xc042bbe0,
file=0xc038d8ee "../../../kern/kern_synch.c", line=454)
at ../../../kern/subr_witness.c:927
#19 0xc022653c in msleep (ident=0xc223a7b8, mtx=0xc042bbe0, priority=72,
wmesg=0x0, timo=0) at ../../../kern/kern_synch.c:454
#20 0xc0217497 in acquire (lkp=0xc223a7b8, extflags=16777280, wanted=1536)
at ../../../kern/kern_lock.c:168
#21 0xc02177d0 in lockmgr (lkp=0xc223a7b8, flags=16842754, interlkp=0x1000040,
td=0xc2667480) at ../../../kern/kern_lock.c:381
#22 0xc025c758 in vop_stdlock (ap=0x0) at ../../../kern/vfs_default.c:279
#23 0xc02ee573 in ufs_vnoperate (ap=0x0) at ../../../ufs/ufs/ufs_vnops.c:2770
#24 0xc026c36a in vn_lock (vp=0xc223a6f0, flags=65538, td=0xc2667480)
at vnode_if.h:871
#25 0xc0263665 in vrele (vp=0xc223a6f0) at ../../../kern/vfs_subr.c:1963
#26 0xc0264a5a in sysctl_vnode (oidp=0xc03f9aa0, arg1=0x0, arg2=0,
req=0xc9c17c08) at ../../../kern/vfs_subr.c:2835
#27 0xc0228826 in sysctl_root (oidp=0x0, arg1=0xc9c17cb4, arg2=2,
req=0xc9c17c08) at ../../../kern/kern_sysctl.c:1147
#28 0xc02289e4 in userland_sysctl (td=0x0, name=0xc9c17cb4, namelen=2,
old=0xc9c17c60, oldlenp=0xa, inkernel=0, new=0xc9c17c30, newlen=0,
retval=0xc9c17cb0) at ../../../kern/kern_sysctl.c:1242
#29 0xc02288a9 in __sysctl (td=0xc2667480, uap=0xc9c17d14)
at ../../../kern/kern_sysctl.c:1181
#30 0xc033a7a4 in syscall (frame=
{tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = -1077939888, tf_esi = 2, tf_ebp =
-1079200088, tf_isp = -910066316, tf_ebx = -1079200048, tf_edx = -1077937728, tf_ecx =
-1077939912, tf_eax = 202, tf_trapno = 12, tf_err = 2, tf_eip = 134575943, tf_cs = 31,
tf_eflags = 658, tf_esp = -1079200132, tf_ss = 47})
at ../../../i386/i386/trap.c:1050
#31 0xc0326c1d in Xint0x80_syscall () at /var/tmp//ccTCRbXy.s:141
---Can't read userspace from dump, or kernel process---
(kgdb) quit
Anything I can do here to help?
- alex
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