On Wed, 2014-04-09 at 07:35 -0600, Jens Axboe wrote: > On 04/08/2014 10:44 PM, Benjamin Herrenschmidt wrote: > > Hi folks ! > > > > While testing a branch of fixes before I send it to Linus, which > > happens to be based on 18a1a7a1d862ae0794a0179473d08a414dd49234, > > I hit this: > > > > kernel BUG at /home/benh/linux-powerpc-test/block/cfq-iosched.c:3145! > > cpu 0x3c: Vector: 700 (Program Check) at [c000003ca69bb190] > > pc: c00000000033b05c: .cfq_dispatch_requests+0x90/0x99c > > lr: c00000000033b038: .cfq_dispatch_requests+0x6c/0x99c > > sp: c000003ca69bb410 > > msr: 9000000000029032 > > current = 0xc000003ca63d32a0 > > paca = 0xc00000000ffef000 softe: 0 irq_happened: 0x01 > > pid = 3487, comm = smartd > > kernel BUG at /home/benh/linux-powerpc-test/block/cfq-iosched.c:3145! > > enter ? for help > > [c000003ca69bb4c0] c00000000032000c .elv_drain_elevator+0x70/0xc8 > > [c000003ca69bb540] c000000000320140 .__elv_add_request+0xdc/0x27c > > [c000003ca69bb5e0] c0000000003286f8 .blk_execute_rq_nowait+0xc0/0xf8 > > [c000003ca69bb670] c0000000003287ec .blk_execute_rq+0xbc/0xe8 > > [c000003ca69bb810] c000000000332350 .sg_io+0x218/0x39c > > [c000003ca69bb930] c000000000332c3c .scsi_cmd_ioctl+0x270/0x4ac > > [c000003ca69bba70] c0000000005d559c .sd_ioctl+0xa4/0xd8 > > [c000003ca69bbb20] c00000000032eb1c .__blkdev_driver_ioctl+0x34/0x54 > > [c000003ca69bbb90] c00000000032f83c .blkdev_ioctl+0x7b8/0x850 > > [c000003ca69bbc40] c00000000018d6e0 .block_ioctl+0x4c/0x60 > > [c000003ca69bbcb0] c0000000001691cc .do_vfs_ioctl+0x5cc/0x670 > > [c000003ca69bbd90] c0000000001692b4 .SyS_ioctl+0x44/0x70 > > [c000003ca69bbe30] c00000000000a024 syscall_exit+0x0/0x98 > > --- Exception: c00 (System Call) at 00003fffb5240ee0 > > > > The storage driver is our usual IBM "IPR". > > > > Is that a known issue ? > > Nope, that's not a known issue. This must be related to the FIFO > changes... How reproducible is this?
Dunno yet, haven't had a chance to dig. I'll try to grab that machine later today and reproduce &| bisect. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
