[Xenomai-help] Ipipe causes PCI / USB crash

[Xenomai-help] Ipipe causes PCI / USB crash

[Steven A. Falco]

I have a Sequoia (PPC440EPx) evaluation board, with an Agere USB interface
plugged into the PCI bus.  The kernel is DENX 2.6.26.1 with Ipipe 2.2-04
from the xenomai-2.4.5 release.

If Ipipe is included in my .config, then when I plug in a Sandisk flash
device, I get the crash shown below.  If I remove Ipipe from the .config,
then the flash device works correctly.

Please let me know if additional information is needed to help diagnose this.

	Thanks,
	Steve


Badness at c012c190 [verbose debug info unavailable]
NIP: c012c190 LR: c012c250 CTR: 00000000
REGS: cec8fa80 TRAP: 0700   Not tainted  (2.6.26.1-00044-g93df51c-dirty)
MSR: 00029000 <EE,ME>  CR: 24082048  XER: 20000004
TASK = cf8c6d60[933] 'usb-stor-scan' THREAD: cec8e000
GPR00: 00000001 cec8fb30 cf8c6d60 cf3bc810 00000000 cf3c3708 00000001 c012c2a0
GPR08: 00000000 c0330000 ced0e060 cec8fb5c 44082042 00000000 00000000 cec8fe09
GPR16: 00000024 cec8fe00 c02d2ea8 c02d300c cec9ee00 c02d3050 cec8fc70 cecfb400
GPR24: cec9ea00 00001d4c ced0eb40 cf3bc810 00000001 cf3bc810 00000000 cf3c3708
NIP [c012c190] blk_execute_rq_nowait+0x40/0x90
LR [c012c250] blk_execute_rq+0x70/0xc0
Call Trace:
[cec8fb30] [00029000] 0x29000 (unreliable)
[cec8fb50] [c012c250] blk_execute_rq+0x70/0xc0
[cec8fbe0] [c01835e4] scsi_execute+0xdc/0x128
[cec8fc10] [c01836b4] scsi_execute_req+0x84/0xcc
[cec8fc50] [c018a258] sd_revalidate_disk+0x2a4/0x144c
[cec8fcd0] [c018bf90] sd_probe+0x20c/0x39c
[cec8fd10] [c01634dc] driver_probe_device+0xb8/0x1e8
[cec8fd30] [c0162680] bus_for_each_drv+0x70/0xac
[cec8fd60] [c016375c] device_attach+0x84/0xa8
[cec8fd80] [c0162474] bus_attach_device+0x6c/0x78
[cec8fd90] [c0160f1c] device_add+0x400/0x53c
[cec8fdd0] [c0187fa8] scsi_sysfs_add_sdev+0x4c/0x24c
[cec8fdf0] [c01859e8] scsi_probe_and_add_lun+0x9ec/0xa4c
[cec8fe80] [c0185d68] __scsi_scan_target+0xec/0x680
[cec8ff40] [c0186380] scsi_scan_channel+0x84/0xa4
[cec8ff60] [c01864b0] scsi_scan_host_selected+0x110/0x184
[cec8ff90] [c01dd100] usb_stor_scan_thread+0x5c/0x134
[cec8ffd0] [c0036e74] kthread+0x48/0x84
[cec8fff0] [c000df2c] kernel_thread+0x44/0x60
Instruction dump:
90850064 80050014 90e500bc 60000040 90050014 3d20c033 80096898 7cc60034
54c6d97e 540007fe 38c60001 7c7d1b78 <0f000000> 3d60c033 392b6898 38000001

Re: [Xenomai-help] Ipipe causes PCI / USB crash

[Steven A. Falco]

Steven A. Falco wrote:
> I have a Sequoia (PPC440EPx) evaluation board, with an Agere USB interface
> plugged into the PCI bus.  The kernel is DENX 2.6.26.1 with Ipipe 2.2-04
> from the xenomai-2.4.5 release.

I tried turning on more debugging, and captured the following crash.  Line 1290
of buffer.c is in the following routine:

static inline void check_irqs_on(void)
{
#ifdef irqs_disabled
	BUG_ON(irqs_disabled());     <----- line 1290
#endif
}

where irqs_disabled() is defined as __ipipe_test_root()


kernel BUG at /n/maytag/proj/hydra/sw/sfalco/linux-2.6-denx/fs/buffer.c:1290!
Oops: Exception in kernel mode, sig: 5 [#1]
Hydra_temp
Modules linked in:
NIP: c00d7b48 LR: c00d7d7c CTR: c010701c
REGS: ced5da40 TRAP: 0700   Not tainted  (2.6.26.1-00044-g93df51c-dirty)
MSR: 00029000 <EE,ME>  CR: 44028082  XER: 20000000
TASK = cf8c79c0[967] 'snmpd' THREAD: ced5c000
GPR00: 00000001 ced5daf0 cf8c79c0 cf410680 00000001 00000000 00017201 00000400
GPR08: cec87a00 c0380000 0000000b 00017201 44028082 10213ff4 cf5b2b80 1f9eef0f
GPR16: 00000040 bfd60d24 ced5de8c ced5dd88 cf5a73f8 cf5a73f8 00000000 00017201
GPR24: cf410680 ced5dc70 24028084 00000400 cf5a73f8 00000000 c037a898 cf5b2b80
NIP [c00d7b48] __find_get_block+0x28/0x238
LR [c00d7d7c] __getblk+0x24/0x2b0
Call Trace:
[ced5daf0] [ced5dba0] 0xced5dba0 (unreliable)
[ced5db40] [c00d7d7c] __getblk+0x24/0x2b0
[ced5dba0] [c0100ab4] ext3_getblk+0xcc/0x204
[ced5dc00] [c0101d00] ext3_bread+0x18/0xb8
[ced5dc20] [c0104b48] dx_probe+0x58/0x378
[ced5dc50] [c01050e0] ext3_find_entry+0x278/0x634
[ced5dd10] [c0107064] ext3_lookup+0x48/0x128
[ced5dd40] [c00b8868] do_lookup+0x16c/0x1f0
[ced5dd70] [c00ba45c] __link_path_walk+0x57c/0xda8
[ced5dde0] [c00bacd0] path_walk+0x48/0xc8
[ced5de10] [c00baf4c] do_path_lookup+0x68/0x16c
[ced5de40] [c00bbc30] __path_lookup_intent_open+0x58/0xc4
[ced5de70] [c00bbfc8] do_filp_open+0x88/0x7d0
[ced5df20] [c00adac8] do_sys_open+0x5c/0xfc
[ced5df40] [c000ea4c] ret_from_syscall+0x0/0x3c
Instruction dump:
813f000c 4bffffac 9421ffb0 7c0802a6 7d800026 bf210034 90010054 91810030
3d20c038 8009a898 3bc9a898 540007fe <0f000000> 38000008 7c0903a6 3d20c03c
---[ end trace 8408831a88b0a69c ]---