Date: Sun, 17 Nov 2002 01:50:25 -0800 From: "Joel M. Baldwin" <qumqats@outel.org> To: current@freebsd.org Subject: more info from panic from running dnet on SMP kernel ( lock order reversal, recursed on non-recursive lock ) Message-ID: <211086306.1037497825@[192.168.1.20]>
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running dnet on a SMP kernel causes the kernel to panic.
lock order reversal
1st 0xc2c803e8 process lock (process lock) @=20
../../../kern/kern_fork.c:571
2nd 0xc03cfce0 proctree (proctree) @ ../../../kern/kern_fork.c:596
recursed on non-recursive lock (sleep mutex) process lock @=20
../../../kern/kern_fork.c:599
first acquired @ ../../../kern/kern_fork.c:571
panic: recurse
cpuid =3D 1; lapic.id =3D 01000000
Debugger("panic")
Stopped at Debugger+0x55: xchgl %ebx,in_Debugger.0
db> t
Debugger(c03926fa,1000000,c0395ada,d26f5c08,1) at Debugger+0x55
panic(c0395ada,c038feab,23b,c038feab,257) at panic+0x11f
witness_lock(c2c803e8,8,c038feab,257,0) at witness_lock+0x3e6
_mtx_lock_flags(c2c803e8,0,c038feab,257,d26f5cb8) at=20
_mtx_lock_flags+0xb2
fork1(c2773d00,6050,0,d26f5cd4,c2c803e8) at fork1+0xbfc
rfork(c2773d00,d26f5d10,c03b07a2,407,1) at rfork+0x65
syscall(2f,2f,2f,0,80ddf10) at syscall+0x28e
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (251, FreeBSD ELF32, rfork), eip =3D 0x8087d14, esp =3D=20
0xbfbff4a8, ebp =3D 0xbfbff524 ---
db> ps
pid proc addr uid ppid pgrp flag stat wmesg wchan=20
cmd
6217 c2b98e00 d28a7000 0 6215 6216 0000000 newpanic: unknown=20
thread state
cpuid =3D 1; lapic.id =3D 01000000
boot() called on cpu#1
Uptime: 1h43m39s
pfs_vncache_unload(): 1 entries remaining
Dumping 255 MB
16 32 48 64 80 96 112 128 144 160 176 192 208 224 240
Dump complete
Automatic reboot in 15 seconds - press a key on the console to abort
Rebooting...
cpu_reset called on cpu#1
cpu_reset: Restarting BSP
cpu_reset_proxy: Stopped CPU 1
And then when the system came back up and I took a closer
look at the core dump.
(kgdb) where
#0 doadump () at ../../../kern/kern_shutdown.c:232
#1 0xc02114ad in boot (howto=3D260) at =
../../../kern/kern_shutdown.c:364
#2 0xc0211767 in panic () at ../../../kern/kern_shutdown.c:517
#3 0xc014f2bc in db_ps (dummy1=3D-1070342907, dummy2=3D0, dummy3=3D-1, =
dummy4=3D0xd26f5a24 "")
at ../../../ddb/db_ps.c:169
#4 0xc014d142 in db_command (last_cmdp=3D0xc03be920, cmd_table=3D0x0,=20
aux_cmd_tablep=3D0xc03b5540,
aux_cmd_tablep_end=3D0xc03b5558) at ../../../ddb/db_command.c:346
#5 0xc014d256 in db_command_loop () at ../../../ddb/db_command.c:472
#6 0xc014feea in db_trap (type=3D3, code=3D0) at =
../../../ddb/db_trap.c:72
#7 0xc033da10 in kdb_trap (type=3D3, code=3D0, regs=3D0xd26f5b80)
at ../../../i386/i386/db_interface.c:166
#8 0xc0356a3f in trap (frame=3D
{tf_fs =3D -1069481960, tf_es =3D 16, tf_ds =3D 16, tf_edi =3D=20
-1032372992, tf_esi =3D 256, tf_ebp =3D -764453940, tf_isp =3D =
-764453972,=20
tf_ebx =3D 0, tf_edx =3D 0, tf_ecx =3D 1, tf_eax =3D 18, tf_trapno =3D =
3, tf_err=20
=3D 0, tf_eip =3D -1070342907, tf_cs =3D 8, tf_eflags =3D 662, tf_esp =
=3D=20
-1069883258, tf_ss =3D -1069996294}) at ../../../i386/i386/trap.c:603
#9 0xc033f238 in calltrap () at {standard input}:99
#10 0xc021174f in panic (fmt=3D0x0) at =
../../../kern/kern_shutdown.c:503
#11 0xc02333d6 in witness_lock (lock=3D0xc2c803e8, flags=3D8,
file=3D0xc038feab "../../../kern/kern_fork.c", line=3D599) at=20
../../../kern/subr_witness.c:609
#12 0xc02079c2 in _mtx_lock_flags (m=3D0xc03cf4c0, opts=3D0,=20
file=3D0xc042cfd4 "=E8\003=C8=C2=AB=FE8=C0;\002",
line=3D-1027079192) at ../../../kern/kern_mutex.c:328
#13 0xc01fd3ec in fork1 (td=3D0xc2773d00, flags=3D24656, pages=3D0,=20
procp=3D0xd26f5cd4)
at ../../../kern/kern_fork.c:599
#14 0xc01fc6c5 in rfork (td=3D0xc2773d00, uap=3D0xd26f5d10) at=20
../../../kern/kern_fork.c:168
#15 0xc035739e in syscall (frame=3D
{tf_fs =3D 47, tf_es =3D 47, tf_ds =3D 47, tf_edi =3D 0, tf_esi =
=3D=20
135126800, tf_ebp =3D -1077938908, tf_isp =3D -764453516, tf_ebx =3D 2, =
tf_edx =3D 135381248, tf_ecx =3D 135381248, tf_eax =3D 251, tf_trapno =
=3D 0,=20
tf_err =3D 2, tf_eip =3D 134774036, tf_cs =3D 31, tf_eflags =3D 659, =
tf_esp =3D=20
-1077939032, tf_ss =3D 47})
at ../../../i386/i386/trap.c:1033
#16 0xc033f28d in Xint0x80_syscall () at {standard input}:141
---Can't read userspace from dump, or kernel process---
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