linux-ext4 - Re: found a scenario for BUG at fs/ext4/super.c:804!

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Date:	Sat, 03 Aug 2013 17:36:38 +0200
From:	Toralf Förster <toralf.foerster@....de>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	linux-ext4@...r.kernel.org, trinity@...r.kernel.org
Subject: Re: found a scenario for BUG at fs/ext4/super.c:804!

forget to attach the back trace of the uML of an EXT3 est case :

tfoerste@n22 ~ $ gdb --core=/mnt/ramdisk/core /usr/local/bin/linux-v3.11-rc3-288-gabe0308 -n -batch -ex bt
                                                                                                                                                       
warning: core file may not match specified executable file.                                                                                            
[New LWP 8384]                                                                                                                                         
Core was generated by `/usr/local/bin/linux-v3.11-rc3-288-gabe0308 earlyprintk ubda=/home/tfoerste/vir'.                                               
Program terminated with signal 6, Aborted.                                                                                                             
#0  0xb7735424 in __kernel_vsyscall ()                                                                                                                 
#0  0xb7735424 in __kernel_vsyscall ()                                                                                                                 
#1  0x083a3185 in kill ()                                                                                                                              
#2  0x0807163d in uml_abort () at arch/um/os-Linux/util.c:93                                                                                           
#3  0x08071925 in os_dump_core () at arch/um/os-Linux/util.c:138
#4  0x080613a7 in panic_exit (self=0x85a1518 <panic_exit_notifier>, unused1=0, unused2=0x85d6ce0 <buf.15904>) at arch/um/kernel/um_arch.c:240
#5  0x0809a388 in notifier_call_chain (nl=0x0, val=0, v=0x85d6ce0 <buf.15904>, nr_to_call=-2, nr_calls=0x0) at kernel/notifier.c:93
#6  0x0809a4d3 in __atomic_notifier_call_chain (nr_calls=<optimized out>, nr_to_call=<optimized out>, v=<optimized out>, val=<optimized out>, nh=<optimized out>) at kernel/notifier.c:182
#7  atomic_notifier_call_chain (nh=0x85d6cc4 <panic_notifier_list>, val=0, v=0x85d6ce0 <buf.15904>) at kernel/notifier.c:191
#8  0x08400968 in panic (fmt=0x0) at kernel/panic.c:128
#9  0x08168632 in ext3_put_super (sb=0x650e0f50) at fs/ext3/super.c:453
#10 0x08101092 in generic_shutdown_super (sb=0x650e0f50) at fs/super.c:418
#11 0x0810205a in kill_block_super (sb=0x0) at fs/super.c:1028
#12 0x08100f2a in deactivate_locked_super (s=0x650e0f50) at fs/super.c:299
#13 0x08100fc1 in deactivate_super (s=0x650e0f50) at fs/super.c:324
#14 0x08118dec in mntfree (mnt=<optimized out>) at fs/namespace.c:891
#15 mntput_no_expire (mnt=0x0) at fs/namespace.c:929
#16 0x0811a2d5 in SYSC_umount (flags=<optimized out>, name=<optimized out>) at fs/namespace.c:1335
#17 SyS_umount (name=134543744, flags=0) at fs/namespace.c:1305
#18 0x0811a349 in SYSC_oldumount (name=<optimized out>) at fs/namespace.c:1347
#19 SyS_oldumount (name=134543744) at fs/namespace.c:1345
#20 0x080618e2 in handle_syscall (r=0x663f6bd4) at arch/um/kernel/skas/syscall.c:35
#21 0x08073c0d in handle_trap (local_using_sysemu=<optimized out>, regs=<optimized out>, pid=<optimized out>) at arch/um/os-Linux/skas/process.c:198
#22 userspace (regs=0x663f6bd4) at arch/um/os-Linux/skas/process.c:431
#23 0x0805e65c in fork_handler () at arch/um/kernel/process.c:160
#24 0x5a5a5a5a in ?? ()


-- 
MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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