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List:       jfs-discussion
Subject:    [Jfs-discussion] Assertion jfs_logmgr.c:2333 assert(bp->l_flag & lbmRELEASE)
From:       Pedro Fonseca <pfonseca () mpi-sws ! org>
Date:       2014-03-27 12:58:38
Message-ID: 5334207E.1040007 () mpi-sws ! org
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Hi,

I've encountered a kernel bug that triggers an assertion in jfs_logmgr.c 
("assert(bp->l_flag & lbmRELEASE)") while running a custom test case on 
jfs (kernel 3.13.5), inside a QEMU based VM.

The assertion was triggered after doing two concurrent writes on 
different files located in the same directory.

Here's the system log output:
> [  244.458647] BUG at 
> /local/pfonseca/piking/kernel-build/linux-3.13.5-fs-static2/fs/jfs/jfs_logmgr.c:2333 
> assert(bp->l_flag & lbmRELEASE)
> [  244.458647] ------------[ cut here ]------------
> [  244.458647] kernel BUG at 
> /local/pfonseca/piking/kernel-build/linux-3.13.5-fs-static2/fs/jfs/jfs_logmgr.c:2333!
> [  244.458647] invalid opcode: 0000 [#1] SMP
> [  244.458647] Modules linked in: jfs loop rtc_cmos tpm_tis pcspkr 
> i2c_piix4
> [  244.458647] CPU: 1 PID: 2655 Comm: loop0 Not tainted 3.13.5 #2
> [  244.458647] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2007
> [  244.458647] task: c67645f0 ti: c6788000 task.ti: c6788000
> [  244.458647] EIP: 0060:[<e11bc4da>] EFLAGS: 00000046 CPU: 1
> [  244.458647] EIP is at lbmIODone+0x2c6/0x302 [jfs]
> [  244.458647] EAX: 0000007b EBX: cfb9bbc0 ECX: 00000093 EDX: 00000046
> [  244.458647] ESI: 00000297 EDI: c612a080 EBP: c6789ef8 ESP: c6789ecc
> [  244.458647]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> [  244.458647] CR0: 8005003b CR2: b775d000 CR3: 01adb000 CR4: 00000690
> [  244.458647] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [  244.458647] DR6: 00000000 DR7: 00000000
> [  244.458647] Stack:
> [  244.458647]  e11c57b4 e11c5764 0000091d e11c58d8 e0eed3a5 12a02000 
> 00000000 cfbd5200
> [  244.458647]  cfbd5200 00000000 00000000 c6789f00 c10c78f2 c6789f68 
> e0eee04a c612a0c8
> [  244.458647]  cfbd531c e0eed36b cfa11bc0 00000001 12a02000 00000000 
> c612a080 cfbd5200
> [  244.458647] Call Trace:
> [  244.458647]  [<e0eed3a5>] ? do_lo_send_direct_write+0x3a/0x44 [loop]
> [  244.458647]  [<c10c78f2>] bio_endio+0x25/0x27
> [  244.458647]  [<e0eee04a>] loop_thread+0x402/0x426 [loop]
> [  244.458647]  [<e0eed36b>] ? __do_lo_send_write+0xbc/0xbc [loop]
> [  244.458647]  [<e0eedc48>] ? loop_attr_do_show_autoclear+0x12/0x12 
> [loop]
> [  244.458647]  [<c103e88e>] kthread+0x82/0x87
> [  244.458647]  [<c16b2b77>] ret_from_kernel_thread+0x1b/0x28
> [  244.458647]  [<c103e80c>] ? __kthread_parkme+0x50/0x50
> [  244.458647] Code: eb 04 83 66 78 fe 8b 55 e4 8b 45 ec eb 4c a8 04 
> 75 1b 68 d8 58 1c e1 68 1d 09 00 00 68 64 57 1c e1 68 b4 57 1c e1 e8 
> f2 b8 4e e0 <0f> 0b a8 10 75 1b 68 f0 58 1c e1 68 1e 09 00 00 68 64 57 
> 1c e1
> [  244.458647] EIP: [<e11bc4da>] lbmIODone+0x2c6/0x302 [jfs] SS:ESP 
> 0068:c6789ecc
> [  244.458647] ---[ end trace b54a6d87b1fd064d ]---


Pedro




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