might_sleep warnings in gereric_make_request
Hi:
I want to call genric_make_request in bio->bi_end_io function. But it incurs might_sleep warnings! I wonder this method is safe in the kernel? Thanks a lot!
cfq: depth 4 reached, tagging now on
Debug: sleeping function called from invalid context at drivers/block/ll_rw_blk.c:2878 in_atomic():1, irqs_disabled():0
[<c0279467>] generic_make_request+0x1e/0x23a [<c011ad1a>] recalc_task_prio+0xc1/0x150 [<c011adff>] activate_task+0x56/0x65 [<e0a35dfb>] raid1_end_sync_read+0x245/0x364 [raid1] [<c011be66>] __wake_up_common+0x39/0x59 [<e0a35bb6>] raid1_end_sync_read+0x0/0x364 [raid1] [<c0181f29>] bio_endio+0x3d/0x68 [<c015576c>] mempool_free+0x67/0x1ca [<c0279a25>] __end_that_request_first+0xc1/0x1f5 [<c0274a70>] elv_queue_empty+0x12/0x1b [<e0821e45>] scsi_end_request+0x1e/0x210 [scsi_mod] [<c015576c>] mempool_free+0x67/0x1ca [<c02e5460>] ip_local_deliver+0x60/0x1a2 [<e082231b>] scsi_io_completion+0x16c/0x4c2 [scsi_mod] [<c011ad1a>] recalc_task_prio+0xc1/0x150 [<c011ad1a>] recalc_task_prio+0xc1/0x150 [<e0869fe2>] sd_rw_intr+0x137/0x3b1 [sd_mod] [<e081b3a9>] scsi_finish_command+0x8e/0xc1 [scsi_mod] [<c0103c0e>] common_interrupt+0x1a/0x20 [<e081b2d0>] scsi_softirq+0x9e/0xc3 [scsi_mod] [<c0127f1e>] __do_softirq+0x3e/0x8a [<c0105c29>] do_softirq+0x3e/0x42 ======================= [<c0105b24>] do_IRQ+0x51/0x82 [<c0105b24>] do_IRQ+0x51/0x82 [<c0103c0e>] common_interrupt+0x1a/0x20 [<c010101a>] default_idle+0x0/0x29 [<c0101040>] default_idle+0x26/0x29 [<c01010a6>] cpu_idle+0x34/0x4c [<c03be71f>] start_kernel+0x154/0x1ab [<c03be2fe>] unknown_bootoption+0x0/0x1cd cfq: depth 4 reached, tagging now on Debug: sleeping function called from invalid context at drivers/block/ll_rw_blk.c:2878 in_atomic():1, irqs_disabled():0 [<c0279467>] generic_make_request+0x1e/0x23a [<c015576c>] mempool_free+0x67/0x1ca [<c0276e35>] __generic_unplug_device+0x31/0x33 [<c011be66>] __wake_up_common+0x39/0x59 [<e0a35dfb>] raid1_end_sync_read+0x245/0x364 [raid1] [<e08f67a3>] raid_done_sync+0x2b/0x4a [raid] [<c02cbae7>] skb_checksum+0x55/0x2cc [<e0a35bb6>] raid1_end_sync_read+0x0/0x364 [raid1] [<c0181f29>] bio_endio+0x3d/0x68 [<c015576c>] mempool_free+0x67/0x1ca [<c0279a25>] __end_that_request_first+0xc1/0x1f5 [<c0274a70>] elv_queue_empty+0x12/0x1b [<e0821e45>] scsi_end_request+0x1e/0x210 [scsi_mod] [<c015576c>] mempool_free+0x67/0x1ca [<c02e5460>] ip_local_deliver+0x60/0x1a2 [<e082231b>] scsi_io_completion+0x16c/0x4c2 [scsi_mod] [<e0869fe2>] sd_rw_intr+0x137/0x3b1 [sd_mod] [<c012c59e>] cascade+0x21/0x3b [<e081b3a9>] scsi_finish_command+0x8e/0xc1 [scsi_mod] [<c0103c0e>] common_interrupt+0x1a/0x20 [<e081b2d0>] scsi_softirq+0x9e/0xc3 [scsi_mod] [<c0127f1e>] __do_softirq+0x3e/0x8a [<c0105c29>] do_softirq+0x3e/0x42 ======================= [<c0105b24>] do_IRQ+0x51/0x82 [<c0105b24>] do_IRQ+0x51/0x82 [<c0103c0e>] common_interrupt+0x1a/0x20 [<c010101a>] default_idle+0x0/0x29 [<c0101040>] default_idle+0x26/0x29 [<c01010a6>] cpu_idle+0x34/0x4c [<c03be71f>] start_kernel+0x154/0x1ab [<c03be2fe>] unknown_bootoption+0x0/0x1cd
Quoted 7 lines · Zhikun Wang
Hi:
I want to call genric_make_request in bio->bi_end_io function. But it incurs might_sleep warnings! I wonder this method is safe in the kernel? Thanks a lot!cfq: depth 4 reached, tagging now on
Debug: sleeping function called from invalid context atdrivers/block/ll_rw_blk.c:2878in_atomic():1, irqs_disabled():0
You can't call generic_make_request() from interrupt context. What are you trying to do?
A message that is not in the archive (sent off-list or not yet received): [email protected]
Quoted 3 lines · Zhikun Wang
I want to write one disk data to another disk. So i call
generic_make_requestin firstbio->bi_end_io! Would you please suggest another approach?
Thanks!
Like raid-1? Maybe drivers/md/raid1.c would give you some useful hints.