Hi,my code get Segmentation fault when using librbd to do sync read IO. From the trace, I can say there are several read IOs get successfully, but the last read IO (2015-10-31 08:56:34.804383) can not be returned and my code got segmentation fault. I used rbd_read interface and malloc a buffer for read data buffer.
Anybody can help this? Thanks.
2015-10-31 08:56:34.750411 7f04bcbdc7c0 20 librbd: read 0x17896d0 off = 0 len = 4096
2015-10-31 08:56:34.750436 7f04bcbdc7c0 20 librbd: aio_read 0x17896d0 completion 0x1799440 [0,4096]
2015-10-31 08:56:34.750442 7f04bcbdc7c0 20 librbd: ictx_check 0x17896d0
2015-10-31 08:56:34.750451 7f04bcbdc7c0 20 librbd::AsyncOperation: 0x1799570 start_op
2015-10-31 08:56:34.750453 7f04bcbdc7c0 20 librbd: oid rb.0.8597.2ae8944a.000000000000 0~4096 from [0,4096]
2015-10-31 08:56:34.750457 7f04bcbdc7c0 10 librbd::ImageCtx: prune_parent_extents image overlap 0, object overlap 0 from image extents []
2015-10-31 08:56:34.750462 7f04bcbdc7c0 20 librbd::AioRequest: send 0x1799c60 rb.0.8597.2ae8944a.000000000000 0~4096
2015-10-31 08:56:34.750498 7f04bcbdc7c0 1 -- 192.168.90.240:0/1006544 --> 192.168.90.253:6801/2041 -- osd_op(client.34253.0:92 rb.0.8597.2ae8944a.000000000000 [sparse-read 0~4096] 2.7cf90552 ack+read+known_if_redirected e30) v5 -- ?+0 0x179b890 con 0x17877b0
2015-10-31 08:56:34.750526 7f04bcbdc7c0 20 librbd::AioCompletion: AioCompletion::finish_adding_requests 0x1799440 pending 1
2015-10-31 08:56:34.780308 7f04b0bb5700 1 -- 192.168.90.240:0/1006544 <== osd.0 192.168.90.253:6801/2041 5 ==== osd_op_reply(92 rb.0.8597.2ae8944a.000000000000 [sparse-read 0~4096] v0'0 uv8 _ondisk_ = 0) v6 ==== 198+0+4120 (3153096351 0 1287205638) 0x7f0494001ce0 con 0x17877b0
2015-10-31 08:56:34.780408 7f04b14b7700 20 librbd::AioRequest: should_complete 0x1799c60 rb.0.8597.2ae8944a.000000000000 0~4096 r = 0
2015-10-31 08:56:34.780418 7f04b14b7700 20 librbd::AioRequest: should_complete 0x1799c60 READ_FLAT
2015-10-31 08:56:34.780420 7f04b14b7700 20 librbd::AioRequest: complete 0x1799c60
2015-10-31 08:56:34.780421 7f04b14b7700 10 librbd::AioCompletion: C_AioRead::finish() 0x1793710 r = 0
2015-10-31 08:56:34.780422 7f04b14b7700 10 librbd::AioCompletion: got {0=4096} for [0,4096] bl 4096
2015-10-31 08:56:34.780432 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::complete_request() 0x1799440 complete_cb=0x7f04ba2b1240 pending 1
2015-10-31 08:56:34.780434 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::finalize() 0x1799440 rval 4096 read_buf 0x179a5e0 read_bl 0
2015-10-31 08:56:34.780440 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::finalize() copied resulting 4096 bytes to 0x179a5e0
2015-10-31 08:56:34.780442 7f04b14b7700 20 librbd::AsyncOperation: 0x1799570 finish_op
2015-10-31 08:56:34.780766 7f04bcbdc7c0 20 librbd: read 0x17896d0 off = 4096 len = 4096
2015-10-31 08:56:34.780778 7f04bcbdc7c0 20 librbd: aio_read 0x17896d0 completion 0x1799440 [4096,4096]
2015-10-31 08:56:34.780781 7f04bcbdc7c0 20 librbd: ictx_check 0x17896d0
2015-10-31 08:56:34.780786 7f04bcbdc7c0 20 librbd::AsyncOperation: 0x1799570 start_op
2015-10-31 08:56:34.780788 7f04bcbdc7c0 20 librbd: oid rb.0.8597.2ae8944a.000000000000 4096~4096 from [0,4096]
2015-10-31 08:56:34.780790 7f04bcbdc7c0 10 librbd::ImageCtx: prune_parent_extents image overlap 0, object overlap 0 from image extents []
2015-10-31 08:56:34.780793 7f04bcbdc7c0 20 librbd::AioRequest: send 0x179bcc0 rb.0.8597.2ae8944a.000000000000 4096~4096
2015-10-31 08:56:34.780813 7f04bcbdc7c0 1 -- 192.168.90.240:0/1006544 --> 192.168.90.253:6801/2041 -- osd_op(client.34253.0:93 rb.0.8597.2ae8944a.000000000000 [sparse-read 4096~4096] 2.7cf90552 ack+read+known_if_redirected e30) v5 -- ?+0 0x179b5f0 con 0x17877b0
2015-10-31 08:56:34.780833 7f04bcbdc7c0 20 librbd::AioCompletion: AioCompletion::finish_adding_requests 0x1799440 pending 1
2015-10-31 08:56:34.800847 7f04b0bb5700 1 -- 192.168.90.240:0/1006544 <== osd.0 192.168.90.253:6801/2041 6 ==== osd_op_reply(93 rb.0.8597.2ae8944a.000000000000 [sparse-read 4096~4096] v0'0 uv8 _ondisk_ = 0) v6 ==== 198+0+4120 (2253638743 0 3057087703) 0x7f0494001ce0 con 0x17877b0
2015-10-31 08:56:34.800947 7f04b14b7700 20 librbd::AioRequest: should_complete 0x179bcc0 rb.0.8597.2ae8944a.000000000000 4096~4096 r = 0
2015-10-31 08:56:34.800956 7f04b14b7700 20 librbd::AioRequest: should_complete 0x179bcc0 READ_FLAT
2015-10-31 08:56:34.800957 7f04b14b7700 20 librbd::AioRequest: complete 0x179bcc0
2015-10-31 08:56:34.800958 7f04b14b7700 10 librbd::AioCompletion: C_AioRead::finish() 0x1796c90 r = 0
2015-10-31 08:56:34.800959 7f04b14b7700 10 librbd::AioCompletion: got {4096=4096} for [0,4096] bl 4096
2015-10-31 08:56:34.800963 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::complete_request() 0x1799440 complete_cb=0x7f04ba2b1240 pending 1
2015-10-31 08:56:34.800965 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::finalize() 0x1799440 rval 4096 read_buf 0x179a5e0 read_bl 0
2015-10-31 08:56:34.800969 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::finalize() copied resulting 4096 bytes to 0x179a5e0
2015-10-31 08:56:34.800971 7f04b14b7700 20 librbd::AsyncOperation: 0x1799570 finish_op
2015-10-31 08:56:34.801281 7f04bcbdc7c0 20 librbd: read 0x17896d0 off = 12288 len = 4096
2015-10-31 08:56:34.801292 7f04bcbdc7c0 20 librbd: aio_read 0x17896d0 completion 0x1799440 [12288,4096]
2015-10-31 08:56:34.801295 7f04bcbdc7c0 20 librbd: ictx_check 0x17896d0
2015-10-31 08:56:34.801300 7f04bcbdc7c0 20 librbd::AsyncOperation: 0x1799570 start_op
2015-10-31 08:56:34.801301 7f04bcbdc7c0 20 librbd: oid rb.0.8597.2ae8944a.000000000000 12288~4096 from [0,4096]
2015-10-31 08:56:34.801304 7f04bcbdc7c0 10 librbd::ImageCtx: prune_parent_extents image overlap 0, object overlap 0 from image extents []
2015-10-31 08:56:34.801306 7f04bcbdc7c0 20 librbd::AioRequest: send 0x179bcc0 rb.0.8597.2ae8944a.000000000000 12288~4096
2015-10-31 08:56:34.801323 7f04bcbdc7c0 1 -- 192.168.90.240:0/1006544 --> 192.168.90.253:6801/2041 -- osd_op(client.34253.0:94 rb.0.8597.2ae8944a.000000000000 [sparse-read 12288~4096] 2.7cf90552 ack+read+known_if_redirected e30) v5 -- ?+0 0x179b5f0 con 0x17877b0
2015-10-31 08:56:34.801342 7f04bcbdc7c0 20 librbd::AioCompletion: AioCompletion::finish_adding_requests 0x1799440 pending 1
2015-10-31 08:56:34.802176 7f04b0bb5700 1 -- 192.168.90.240:0/1006544 <== osd.0 192.168.90.253:6801/2041 7 ==== osd_op_reply(94 rb.0.8597.2ae8944a.000000000000 [sparse-read 12288~4096] v0'0 uv8 _ondisk_ = 0) v6 ==== 198+0+4120 (4245981639 0 251894080) 0x7f0494001ce0 con 0x17877b0
2015-10-31 08:56:34.802218 7f04b14b7700 20 librbd::AioRequest: should_complete 0x179bcc0 rb.0.8597.2ae8944a.000000000000 12288~4096 r = 0
2015-10-31 08:56:34.802225 7f04b14b7700 20 librbd::AioRequest: should_complete 0x179bcc0 READ_FLAT
2015-10-31 08:56:34.802231 7f04b14b7700 20 librbd::AioRequest: complete 0x179bcc0
2015-10-31 08:56:34.802232 7f04b14b7700 10 librbd::AioCompletion: C_AioRead::finish() 0x1793710 r = 0
2015-10-31 08:56:34.802233 7f04b14b7700 10 librbd::AioCompletion: got {12288=4096} for [0,4096] bl 4096
2015-10-31 08:56:34.802237 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::complete_request() 0x1799440 complete_cb=0x7f04ba2b1240 pending 1
2015-10-31 08:56:34.802239 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::finalize() 0x1799440 rval 4096 read_buf 0x179a5e0 read_bl 0
2015-10-31 08:56:34.802243 7f04b14b7700 20 librbd::AioCompletion: AioCompletion::finalize() copied resulting 4096 bytes to 0x179a5e0
2015-10-31 08:56:34.802245 7f04b14b7700 20 librbd::AsyncOperation: 0x1799570 finish_op
2015-10-31 08:56:34.804372 7f04bcbdc7c0 20 librbd: read 0x17896d0 off = 1073676288 len = 4096
2015-10-31 08:56:34.804383 7f04bcbdc7c0 20 librbd: aio_read 0x17896d0 completion 0x177c390 [1073676288,4096]2015-10-31 09:00:46.602936 7f98ad11d7c0 1 -- :/0 messenger.start
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