more info from panic from running dnet on SMP kernel ( lockorder reversal, recursed on non-recursive lock )

[Joel M. Baldwin]

running dnet on a SMP kernel causes the kernel to panic.


lock order reversal
1st 0xc2c803e8 process lock (process lock) @ ../../../kern/kern_fork.c:571
2nd 0xc03cfce0 proctree (proctree) @ ../../../kern/kern_fork.c:596
recursed on non-recursive lock (sleep mutex) process lock @ ../../../kern/kern_fork.c:599
first acquired @ ../../../kern/kern_fork.c:571
panic: recurse
cpuid = 1; lapic.id = 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 _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 = 0x8087d14, esp = 0xbfbff4a8, ebp = 0xbfbff524 ---
db> ps
pid proc addr uid ppid pgrp flag stat wmesg wchan cmd
6217 c2b98e00 d28a7000 0 6215 6216 0000000 newpanic: unknown thread state
cpuid = 1; lapic.id = 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=260) at ../../../kern/kern_shutdown.c:364
#2 0xc0211767 in panic () at ../../../kern/kern_shutdown.c:517
#3 0xc014f2bc in db_ps (dummy1=-1070342907, dummy2=0, dummy3=-1, dummy4=0xd26f5a24 "")
at ../../../ddb/db_ps.c:169
#4 0xc014d142 in db_command (last_cmdp=0xc03be920, cmd_table=0x0, aux_cmd_tablep=0xc03b5540,
aux_cmd_tablep_end=0xc03b5558) at ../../../ddb/db_command.c:346
#5 0xc014d256 in db_command_loop () at ../../../ddb/db_command.c:472
#6 0xc014feea in db_trap (type=3, code=0) at ../../../ddb/db_trap.c:72
#7 0xc033da10 in kdb_trap (type=3, code=0, regs=0xd26f5b80)
at ../../../i386/i386/db_interface.c:166
#8 0xc0356a3f in trap (frame=
{tf_fs = -1069481960, tf_es = 16, tf_ds = 16, tf_edi = -1032372992, tf_esi = 256, tf_ebp = -764453940, tf_isp = -764453972, tf_ebx = 0, tf_edx = 0, tf_ecx = 1, tf_eax = 18, tf_trapno = 3, tf_err = 0, tf_eip = -1070342907, tf_cs = 8, tf_eflags = 662, tf_esp = -1069883258, tf_ss = -1069996294}) at ../../../i386/i386/trap.c:603
#9 0xc033f238 in calltrap () at {standard input}:99
#10 0xc021174f in panic (fmt=0x0) at ../../../kern/kern_shutdown.c:503
#11 0xc02333d6 in witness_lock (lock=0xc2c803e8, flags=8,
file=0xc038feab "../../../kern/kern_fork.c", line=599) at ../../../kern/subr_witness.c:609
#12 0xc02079c2 in _mtx_lock_flags (m=0xc03cf4c0, opts=0, file=0xc042cfd4 "è\003È«þ8À;\002",
line=-1027079192) at ../../../kern/kern_mutex.c:328
#13 0xc01fd3ec in fork1 (td=0xc2773d00, flags=24656, pages=0, procp=0xd26f5cd4)
at ../../../kern/kern_fork.c:599
#14 0xc01fc6c5 in rfork (td=0xc2773d00, uap=0xd26f5d10) at ../../../kern/kern_fork.c:168
#15 0xc035739e in syscall (frame=
{tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 0, tf_esi = 135126800, tf_ebp = -1077938908, tf_isp = -764453516, tf_ebx = 2, tf_edx = 135381248, tf_ecx = 135381248, tf_eax = 251, tf_trapno = 0, tf_err = 2, tf_eip = 134774036, tf_cs = 31, tf_eflags = 659, tf_esp = -1077939032, tf_ss = 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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