Am Dienstag, den 25.01.2005, 18:28 +0100 schrieb Michael Buesch: > I set up swap on an encrypted dmcrypt device. > While stressing swap usage with make -j200 in the > kernel tree, the machine crashes: > > Adding 1461872k swap on /dev/mapper/swap. Priority:-2 extents:1 > ------------[ cut here ]------------ > kernel BUG at drivers/block/ll_rw_blk.c:2193! > invalid operand: 0000 [#1] > SMP > Modules linked in: ipv6 ohci_hcd tuner tvaudio msp3400 bttv video_buf > firmware_class btcx_risc nvidia ehci_hcd uhci_hcd usbcore intel_agp agpgart > evdev > CPU: 0 > EIP: 0060:[<c0218b8a>] Tainted: P VLI > EFLAGS: 00210002 (2.6.10-ck4-defaultidle) > EIP is at __blk_put_request+0x87/0x91
This seems to be this BUG: BUG_ON(!list_empty(&req->queuelist)); in drivers/block/ll_rw_blk.c. I don't know how this could be non-empty since scsi_end_request calls if (blk_rq_tagged(req)) blk_queue_end_tag(q, req); just before calling end_that_request_last inside the same spinlock. I don't know anything about tagged request handling but I don't think this is the fault of the dm-crypt driver, perhaps it's stressing the queue in some unexpected way? I have no idea what's going on here.
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