[issue1781] lwkt mpsafing related panic

Sun Jun 13 04:40:21 PDT 2010

Am 13/06/2010 01:09 Î¼Î¼, schrieb Alex Hornung (via DragonFly issue tracker):
New submission from Alex Hornung<ahornung at gmail.com>:

Dump is in my ~/crash on leaf, it's kern.0/vmcore.0. It happend with the most
recent master as of now and doing an 'ls' after a branch switch in git.
Well, the last 3 tokrefs in td->td_toks_array are to the vm_token (this 
is OK, recursive acquisition is normal in this path) while the rest 29 
tokrefs are to proc_token (this is not OK, in-kernel recursion can't be 
that deep). Seems like something is wrong on some release path :)

I'd add a check for remaining tokrefs in ->td_toks_array just before 
returning to userland to narrow down the search. Matt and/or Venkatesh 
who did the token changes might already have some suspect path in mind :)

Aggelos

9:59:41 dragon:/var/crash
kgdb kern.0 vmcore.0
GNU gdb (GDB) 7.0
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This GDB was configured as "i386-dragonfly".
For bug reporting instructions, please see:
<http://bugs.dragonflybsd.org/>...
Reading symbols from /var/crash/kern.0...done.
Unread portion of the kernel message buffer:
panic: assertion: ref<  &td->td_toks_end in lwkt_gettoken
mp_lock = 00000002; cpuid = 2
Trace beginning at frame 0xd37b1b60
panic(ffffffff) at panic+0x14f
panic(c05cc483,c05e851f,c05ac87a,d38ee250,c1098650) at panic+0x14f
lwkt_gettoken(c0702698,d38ee250,c1098650,d37b1bc4,c04f6590) at lwkt_gettoken+0x36
vm_page_remove(c1098650,c1098650,c1098650,c1098650,d37b1bd4) at vm_page_remove+0x2a
vm_page_free_toq(c1098650,c1098650,d37b1bfc,c04f437e,c1098650) at
vm_page_free_toq+0xb7
vm_object_terminate_callback(c1098650,0,0,0,c0e0bea0) at
vm_object_terminate_callback+0x46
vm_page_rb_tree_RB_SCAN(d49ad6e0,0,c04f21d4,0,0) at vm_page_rb_tree_RB_SCAN+0xad
vm_object_terminate(d49ad6cc,d49ae618,d49ad6cc,284ce000,d37b1c78) at
vm_object_terminate+0x182
vm_object_deallocate(d49ad6cc) at vm_object_deallocate+0x2bb
vm_map_delete(d3a1ac70,284ca000,284ce000,d37b1c90,4) at vm_map_delete+0x2b2
vm_map_remove(d3a1ac70,284ca000,284ce000,d0bfd1d0,d47927e8) at vm_map_remove+0x52
sys_munmap(d37b1cf0,6,65e82,0,c0691aec) at sys_munmap+0x87
syscall2(d37b1d40) at syscall2+0x3ac
Xint0x80_syscall() at Xint0x80_syscall+0x36
Debugger("panic")
CPU2 stopping CPUs: 0x0000000b
  stopped
Physical memory: 1015 MB
Dumping 234 MB: 219 203 187 171 155 139 123 107 91 75 59 43 27 11
Reading symbols from /boot/modules/dsched_fq.ko...done.
Loaded symbols for /boot/modules/dsched_fq.ko
Reading symbols from /boot/modules/acpi.ko...done.
Loaded symbols for /boot/modules/acpi.ko
Reading symbols from /boot/modules/linux.ko...done.
Loaded symbols for /boot/modules/linux.ko
_get_mycpu (di=0xc06fce00) at ./machine/thread.h:83
83	    __asm ("movl %%fs:globaldata,%0" : "=r" (gd) : "m"(__mycpu__dummy));
(kgdb) bt
#0  _get_mycpu (di=0xc06fce00) at ./machine/thread.h:83
#1  md_dumpsys (di=0xc06fce00) at /usr/src/sys/platform/pc32/i386/dump_machdep.c:263
#2  0xc03204e9 in dumpsys () at /usr/src/sys/kern/kern_shutdown.c:838
#3  0xc017a455 in db_fncall (dummy1=2, dummy2=0, dummy3=-1068058868,
     dummy4=0xd37b1a08 "") at /usr/src/sys/ddb/db_command.c:542
#4  0xc017a946 in db_command () at /usr/src/sys/ddb/db_command.c:344
#5  db_command_loop () at /usr/src/sys/ddb/db_command.c:470
#6  0xc017cf84 in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_trap.c:71
#7  0xc056b92f in kdb_trap (type=3, code=0, regs=0xd37b1b10)
     at /usr/src/sys/platform/pc32/i386/db_interface.c:152
#8  0xc05849e3 in trap (frame=0xd37b1b10) at
/usr/src/sys/platform/pc32/i386/trap.c:837
#9  0xc056cce7 in calltrap () at /usr/src/sys/platform/pc32/i386/exception.s:785
#10 0xc056b70c in breakpoint (msg=0xc05e7d82 "panic") at ./cpu/cpufunc.h:73
#11 Debugger (msg=0xc05e7d82 "panic")
     at /usr/src/sys/platform/pc32/i386/db_interface.c:334
#12 0xc0321015 in panic (fmt=0xc05cc483 "assertion: %s in %s")
     at /usr/src/sys/kern/kern_shutdown.c:742
#13 0xc032c863 in lwkt_gettoken (tok=0xc077650c) at
/usr/src/sys/kern/lwkt_token.c:425
#14 0xc04f6113 in vm_page_remove (m=0xc1098650) at /usr/src/sys/vm/vm_page.c:439
#15 0xc04f6590 in vm_page_free_toq (m=0xc1098650) at /usr/src/sys/vm/vm_page.c:1030
#16 0xc04f221a in vm_page_free (p=0xc1098650, data=0x0) at
/usr/src/sys/vm/vm_page.h:613
#17 vm_object_terminate_callback (p=0xc1098650, data=0x0)
     at /usr/src/sys/vm/vm_object.c:493
#18 0xc04f437e in vm_page_rb_tree_RB_SCAN (head=0xd49ad6e0,
     scancmp=0xc04f4288<vm_page_rb_tree_SCANCMP_ALL>,
     callback=0xc04f21d4<vm_object_terminate_callback>, data=0x0)
     at /usr/src/sys/vm/vm_page.c:108
#19 0xc04f378c in vm_object_terminate (object=0xd49ad6cc)
     at /usr/src/sys/vm/vm_object.c:456
#20 0xc04f4265 in vm_object_deallocate (object=0xd49ad6cc)
     at /usr/src/sys/vm/vm_object.c:392
#21 0xc04ee19a in vm_map_delete (map=0xd3a1ac70, start=676110336, end=676126720,
     countp=0xd37b1c90) at /usr/src/sys/vm/vm_map.c:2571
#22 0xc04ee21d in vm_map_remove (map=0xd3a1ac70, start=676110336, end=676126720)
     at /usr/src/sys/vm/vm_map.c:2727
#23 0xc04f1b46 in sys_munmap (uap=0xd37b1cf0) at /usr/src/sys/vm/vm_mmap.c:566
#24 0xc0583d6a in syscall2 (frame=0xd37b1d40)
     at /usr/src/sys/platform/pc32/i386/trap.c:1319
#25 0xc056cd96 in Xint0x80_syscall () at
/usr/src/sys/platform/pc32/i386/exception.s:876
#26 0x0000001f in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
----------
messages: 8666
nosy: alexh
priority: urgent
status: unread
title: lwkt mpsafing related panic
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DragonFly issue tracker<bugs at lists.dragonflybsd.org>
<http://bugs.dragonflybsd.org/issue1781>
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