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SubjectRe: [2.6.31] Memory leak in SCSI initialization?
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On Tue, 2009-09-22 at 13:18 +0900, Tetsuo Handa wrote:
> Hello.
>
> I can see below message appears for 15 times in
> /sys/kernel/debug/kmemleak after processing /init inside initramfs.
>
> unreferenced object 0xdeadb5c8 (size 32):
> comm "insmod", pid 543, jiffies 4294674766
> backtrace:
> [<c048a22c>] create_object+0x135/0x202
> [<c048a31e>] kmemleak_alloc+0x25/0x49
> [<c04865d9>] kmemleak_alloc_recursive+0x1c/0x22
> [<c0486d33>] __kmalloc+0x6c/0xb9
> [<c04f5675>] kvasprintf+0x2d/0x4a
> [<c04ef5af>] kobject_set_name_vargs+0x21/0x50
> [<c054bbd7>] dev_set_name+0x1a/0x1c
> [<e08dc1b7>] scsi_sysfs_device_initialize+0x8b/0xe4 [scsi_mod]
> [<e08d9bbf>] scsi_alloc_sdev+0x134/0x18f [scsi_mod]
> [<e08d9e7a>] scsi_probe_and_add_lun+0x107/0xa98 [scsi_mod]
> [<e08da946>] __scsi_scan_target+0x70/0x4b1 [scsi_mod]
> [<e08dadbe>] scsi_scan_channel+0x37/0x60 [scsi_mod]
> [<e08dae9f>] scsi_scan_host_selected+0xb8/0xf1 [scsi_mod]
> [<e08daf2c>] do_scsi_scan_host+0x54/0x5d [scsi_mod]
> [<e08db2ef>] scsi_scan_host+0x14d/0x165 [scsi_mod]
> [<e0959771>] mptspi_probe+0x2cd/0x2f8 [mptspi]

I think this will fix it:

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 9ce5c34..284bcbe 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -957,7 +957,7 @@ static inline void scsi_destroy_sdev(struct scsi_device *sdev)
if (sdev->host->hostt->slave_destroy)
sdev->host->hostt->slave_destroy(sdev);
transport_destroy_device(&sdev->sdev_gendev);
- put_device(&sdev->sdev_gendev);
+ put_device(&sdev->sdev_dev);
}

#ifdef CONFIG_SCSI_LOGGING

sdev_dev has class == sdev_class. The release function for sdev_class is
scsi_device_cls_release(), and _that_ does a put on the sdev_gendev.

But someone who groks all that mess, er beauty ;D, should check that
makes sense.

cheers



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