On Wed, 4 Mar 2009, Thomas Gleixner wrote: Instrumented the code and the result of the failing request is below. Looks like the function which sets up the request gets nr_phys_segments wrong by one. If you need further trace data feel free to ask. Thanks, tglx bvprv: bvec_to_phys(bvprv) bvec: bvec_to_phys(bvec) max_segment_size is 65536 scsi_init_sgtable: ISG: nr_seg 9 nents 9 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: new segment 1: bvec 0x6a8cd000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8cd000 bvec 0x6a8ce000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8ce000 bvec 0x6a8cf000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8cf000 bvec 0x6a8d0000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d0000 bvec 0x6a8d1000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d1000 bvec 0x6a8d2000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d2000 bvec 0x6a8d3000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d3000 bvec 0x6a8d4000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d4000 bvec 0x6a8d5000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d5000 bvec 0x6a8d6000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d6000 bvec 0x6a8d7000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d7000 bvec 0x6a8d8000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d8000 bvec 0x6a8d9000 sg->length 49152 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8d9000 bvec 0x6a8da000 sg->length 53248 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8da000 bvec 0x6a8db000 sg->length 57344 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8db000 bvec 0x6a8dc000 sg->length 61440 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8dc000 bvec 0x6a8dd000 sg->length 65536 blk_rq_map_sg: MSG: new segment 2: bvec 0x6a8dd000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8dd000 bvec 0x6a8de000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8de000 bvec 0x6a8df000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8df000 bvec 0x6a8e0000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e0000 bvec 0x6a8e1000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e1000 bvec 0x6a8e2000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e2000 bvec 0x6a8e3000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e3000 bvec 0x6a8e4000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e4000 bvec 0x6a8e5000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e5000 bvec 0x6a8e6000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e6000 bvec 0x6a8e7000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e7000 bvec 0x6a8e8000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e8000 bvec 0x6a8e9000 sg->length 49152 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8e9000 bvec 0x6a8ea000 sg->length 53248 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8ea000 bvec 0x6a8eb000 sg->length 57344 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8eb000 bvec 0x6a8ec000 sg->length 61440 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8ec000 bvec 0x6a8ed000 sg->length 65536 blk_rq_map_sg: MSG: new segment 3: bvec 0x6a8ed000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8ed000 bvec 0x6a8ee000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8ee000 bvec 0x6a8ef000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8ef000 bvec 0x6a8f0000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f0000 bvec 0x6a8f1000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f1000 bvec 0x6a8f2000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f2000 bvec 0x6a8f3000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f3000 bvec 0x6a8f4000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f4000 bvec 0x6a8f5000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f5000 bvec 0x6a8f6000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f6000 bvec 0x6a8f7000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f7000 bvec 0x6a8f8000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f8000 bvec 0x6a8f9000 sg->length 49152 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8f9000 bvec 0x6a8fa000 sg->length 53248 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8fa000 bvec 0x6a8fb000 sg->length 57344 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8fb000 bvec 0x6a8fc000 sg->length 61440 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8fc000 bvec 0x6a8fd000 sg->length 65536 blk_rq_map_sg: MSG: new segment 4: bvec 0x6a8fd000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8fd000 bvec 0x6a8fe000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8fe000 bvec 0x6a8ff000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6a8ff000 bvec 0x6ac80000 sg->length 12288 blk_rq_map_sg: MSG: new segment 5: bvec 0x6ac80000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac80000 bvec 0x6ac81000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac81000 bvec 0x6ac82000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac82000 bvec 0x6ac83000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac83000 bvec 0x6ac84000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac84000 bvec 0x6ac85000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac85000 bvec 0x6ac86000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac86000 bvec 0x6ac87000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac87000 bvec 0x6ac88000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac88000 bvec 0x6ac89000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac89000 bvec 0x6ac8a000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac8a000 bvec 0x6ac8b000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac8b000 bvec 0x6ac8c000 sg->length 49152 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ac8c000 bvec 0x6accd000 sg->length 53248 blk_rq_map_sg: MSG: new segment 6: bvec 0x6accd000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6accd000 bvec 0x6acce000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acce000 bvec 0x6accf000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6accf000 bvec 0x6acd0000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd0000 bvec 0x6acd1000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd1000 bvec 0x6acd2000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd2000 bvec 0x6acd3000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd3000 bvec 0x6acd4000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd4000 bvec 0x6acd5000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd5000 bvec 0x6acd6000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd6000 bvec 0x6acd7000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd7000 bvec 0x6acd8000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd8000 bvec 0x6acd9000 sg->length 49152 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acd9000 bvec 0x6acda000 sg->length 53248 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acda000 bvec 0x6acdb000 sg->length 57344 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acdb000 bvec 0x6acdc000 sg->length 61440 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acdc000 bvec 0x6acdd000 sg->length 65536 blk_rq_map_sg: MSG: new segment 7: bvec 0x6acdd000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acdd000 bvec 0x6acde000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acde000 bvec 0x6acdf000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acdf000 bvec 0x6ace0000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace0000 bvec 0x6ace1000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace1000 bvec 0x6ace2000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace2000 bvec 0x6ace3000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace3000 bvec 0x6ace4000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace4000 bvec 0x6ace5000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace5000 bvec 0x6ace6000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace6000 bvec 0x6ace7000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace7000 bvec 0x6ace8000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace8000 bvec 0x6ace9000 sg->length 49152 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6ace9000 bvec 0x6acea000 sg->length 53248 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acea000 bvec 0x6aceb000 sg->length 57344 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6aceb000 bvec 0x6acec000 sg->length 61440 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acec000 bvec 0x6aced000 sg->length 65536 blk_rq_map_sg: MSG: new segment 8: bvec 0x6aced000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6aced000 bvec 0x6acee000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acee000 bvec 0x6acef000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acef000 bvec 0x6acf0000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf0000 bvec 0x6acf1000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf1000 bvec 0x6acf2000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf2000 bvec 0x6acf3000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf3000 bvec 0x6acf4000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf4000 bvec 0x6acf5000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf5000 bvec 0x6acf6000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf6000 bvec 0x6acf7000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf7000 bvec 0x6acf8000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf8000 bvec 0x6acf9000 sg->length 49152 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acf9000 bvec 0x6acfa000 sg->length 53248 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acfa000 bvec 0x6acfb000 sg->length 57344 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acfb000 bvec 0x6acfc000 sg->length 61440 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acfc000 bvec 0x6acfd000 sg->length 65536 blk_rq_map_sg: MSG: new segment 9: bvec 0x6acfd000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acfd000 bvec 0x6acfe000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acfe000 bvec 0x6acff000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6acff000 bvec 0x6b080000 sg->length 12288 blk_rq_map_sg: MSG: new segment 10: bvec 0x6b080000 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b080000 bvec 0x6b081000 sg->length 4096 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b081000 bvec 0x6b082000 sg->length 8192 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b082000 bvec 0x6b083000 sg->length 12288 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b083000 bvec 0x6b084000 sg->length 16384 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b084000 bvec 0x6b085000 sg->length 20480 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b085000 bvec 0x6b086000 sg->length 24576 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b086000 bvec 0x6b087000 sg->length 28672 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b087000 bvec 0x6b088000 sg->length 32768 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b088000 bvec 0x6b089000 sg->length 36864 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b089000 bvec 0x6b08a000 sg->length 40960 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b08a000 bvec 0x6b08b000 sg->length 45056 blk_rq_map_sg: MSG: nbytes 4096 blk_rq_map_sg: MSG: bvprv 0x6b08b000 bvec 0x6b08c000 sg->length 49152 scsi_init_sgtable: ISG: count 10 -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
