BUG in JFFS2
Hello,
I've hit on bug in JFFS2, but I can not reproduce it easilly yet. I have
stess test which in general creates files, deletes them, creates
directories and deletes them, and so on so on. When I run this test nightly, I see the following error when I come at work in the morning:
kernel BUG at /tester/linux/linux-2.6.8-1.521up-custom-nopreempt/fs/jffs2/gc.c:1164! invalid operand: 0000 [#1]DEBUG_PAGEALLOC
Modules linked in: jffs2 nandsim zlib_deflate mtdchar nand mtdpart nand_ids mtdcore nand_ecc nfsd exportfs md5 ipv6 autofs4d CPU: 0 EIP: 0060:[<22aa58a0>] Not tainted EFLAGS: 00010206 (2.6.8-1.521up-custom-nopreempt)
EIP is at jffs2_garbage_collect_dnode+0x3f0/0x407 [jffs2]
eax: 003976f0 ebx: 00000000 ecx: 00397850 edx: 00000000
esi: 13fc3e00 edi: 13fc3e2c ebp: 07198ea8 esp: 07198e08
ds: 007b es: 007b ss: 0068
Process mkfile (pid: 11938, threadinfo=07198000 task=11dbc9f0)
Stack: 00000010 00000fff 07198e3c 0220c6e7 00398000 07198e2c 00000246 00000000
00397000 003976f0 0902edf8 00000000 13fc3e40 000aa8f5 07198e48
023660b4
07198e7c 00000000 00000000 00000000 00000000 00000000 00000000
00000000
Call Trace:
[<02107c7a>] show_stack+0x7a/0x90
[<02107df7>] show_registers+0x147/0x1f0
[<0210801e>] die+0xee/0x270
[<021084da>] do_invalid_op+0x9a/0xa0
[<ffff3454>] 0xffff3454
[<22aa4131>] jffs2_garbage_collect_live+0x2c1/0x4f0 [jffs2]
[<22aa351c>] jffs2_garbage_collect_pass+0x93c/0x1290 [jffs2]
[<22aab132>] jffs2_flush_wbuf_gc+0xa2/0x140 [jffs2]
[<22a9a7ca>] jffs2_fsync+0x1a/0x20 [jffs2]
[<0217d0c4>] sys_fsync+0xb4/0xf0
[<ffff3200>] 0xffff3200
Code: 0f 0b 8c 04 b4 ed aa 22 eb c5 0f 0b 28 04 b4 ed aa 22 e9 d5May be somebody may comment this without having the test which can easilly reproduce this bug?
P.S. My kernel is 2.6.8.1, UP, Preemption is disabled.
P.P.S. I observed this several times.
Signature · 3 lines
Best Regards, Artem B. Bityuckiy, St.-Petersburg, Russia.
Quoted 9 lines · Artem B. Bityuckiy
Hello,
I've hit on bug in JFFS2, but I can not reproduce it easilly yet. I have
stess test which in general creates files, deletes them, creates
directories and deletes them, and so on so on. When I run this test nightly, I see the following error when I come at work in the morning:kernel BUG at /tester/linux/linux-2.6.8-1.521up-custom-nopreempt/fs/jffs2/gc.c:1164!
In my copy of v1.137 there's three instances of BUG_ON() around there, but none at line 1164. They're at lines 116[123].
Start by changing it from a simple BUG_ON() to a printk saying precisely what went wrong and giving all the other information which might be relevant. If you can just trap into a debugger when it happens, that's even better.
Signature · 1 line
dwmw2
Quoted 8 lines · David Woodhouse
Quoted 6 lines · Artem B. Bityuckiy
Hello,
I've hit on bug in JFFS2, but I can not reproduce it easilly yet. I have
stess test which in general creates files, deletes them, creates
directories and deletes them, and so on so on. When I run this test nightly, I see the following error when I come at work in the morning:
Quoted 5 lines
Quoted 1 line
kernel BUG at /tester/linux/linux-2.6.8-1.521up-custom-nopreempt/fs/jffs2/gc.c:1164!
In my copy of v1.137 there's three instances of
BUG_ON()around there, but none at line 1164. They're at lines 116[123].
I have the lastest MTD snapshot, v1.140. This is BUG_ON(end > JFFS2_F_I_SIZE(f));
Quoted 5 lines
Start by changing it from a simple
BUG_ON()to a printk saying precisely what went wrong and giving all the other information which might be relevant. If you can just trap into a debugger when it happens, that's even better.
I'll do this as soos as I have done other pending JFFS2 tasks :-) I think I'll insert useful printkeyss there since now I have no configured environment to use debugger.
Signature · 3 lines
Best Regards, Artem B. Bityuckiy, St.-Petersburg, Russia.