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Message-ID: <20071027113916.GH8875@kernel.dk> Date: Sat, 27 Oct 2007 13:39:16 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Sebastian Siewior <lkml@...breakpoint.cc> Cc: linux-kernel@...r.kernel.org Subject: Re: [BUG] panic after umount (biscted) On Sat, Oct 27 2007, Sebastian Siewior wrote: > * Jens Axboe | 2007-10-26 13:42:30 [+0200]: > > >> [2] http://download.breakpoint.cc/bug/bug_rc1_patch_reboot.jpeg 171 KiB > > > >Ah, second BUG() for same issue. Try this one. This? > > > >diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c > >index 61fdaf0..57fde7b 100644 > >--- a/drivers/scsi/scsi_lib.c > >+++ b/drivers/scsi/scsi_lib.c > >@@ -1115,6 +1115,8 @@ static int scsi_init_io(struct scsi_cmnd *cmd) > > * kmapping pages) > > */ > > cmd->use_sg = req->nr_phys_segments; > >+ if (!cmd->use_sg) > >+ return 0; > > > > /* > > * If sg table allocation fails, requeue request later. > >@@ -1191,7 +1193,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req) > > if (req->bio) { > > int ret; > > > >- BUG_ON(!req->nr_phys_segments); > >+ BUG_ON(!req->nr_phys_segments && req->bio->bi_size); > > > > ret = scsi_init_io(cmd); > > if (unlikely(ret)) > >@@ -1236,9 +1238,10 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req) > > if (ret != BLKPREP_OK) > > return ret; > > /* > >- * Filesystem requests must transfer data. > >+ * Filesystem requests must transfer data, unless it's an empty > >+ * barrier. > > */ > >- BUG_ON(!req->nr_phys_segments); > >+ BUG_ON(!req->nr_phys_segments && !bio_empty_barrier(req->bio)); > > > > cmd = scsi_get_cmd_from_req(sdev, req); > > if (unlikely(!cmd)) > > > > I'm afraid you did not make it to the next level. I hope you have > another man :). [1] shows the result. I double checked it, it seems to > be the same bug() with the second patch. > > [1] http://download.breakpoint.cc/bug/bug_patch2.jpeg 134 KiB OK, can you see what this produces? diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 61fdaf0..4042269 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1115,6 +1115,8 @@ static int scsi_init_io(struct scsi_cmnd *cmd) * kmapping pages) */ cmd->use_sg = req->nr_phys_segments; + if (!cmd->use_sg) + return 0; /* * If sg table allocation fails, requeue request later. @@ -1191,7 +1193,7 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req) if (req->bio) { int ret; - BUG_ON(!req->nr_phys_segments); + BUG_ON(!req->nr_phys_segments && req->bio->bi_size); ret = scsi_init_io(cmd); if (unlikely(ret)) @@ -1236,9 +1238,11 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req) if (ret != BLKPREP_OK) return ret; /* - * Filesystem requests must transfer data. + * Filesystem requests must transfer data, unless it's an empty + * barrier. */ - BUG_ON(!req->nr_phys_segments); + if (!req->nr_phys_segments && !bio_empty_barrier(req->bio)) + blk_dump_rq_flags(req, "scsi"); cmd = scsi_get_cmd_from_req(sdev, req); if (unlikely(!cmd)) -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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