From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: John David Anglin <dave.anglin@bell.net>
Cc: Helge Deller <deller@gmx.de>,
linux-parisc List <linux-parisc@vger.kernel.org>
Subject: Re: SCSI bug
Date: Sat, 20 Feb 2016 19:47:04 -0800 [thread overview]
Message-ID: <1456026424.2268.5.camel@HansenPartnership.com> (raw)
In-Reply-To: <9C42B388-96D5-412A-BAC3-14E93415CA21@bell.net>
On Sat, 2016-02-20 at 21:52 -0500, John David Anglin wrote:
> On 2016-02-20, at 5:52 PM, John David Anglin wrote:
>
> > On 2016-02-20, at 4:59 PM, Helge Deller wrote:
> >
> > > On 20.02.2016 21:43, John David Anglin wrote:
> > > > On 2016-02-20, at 3:13 PM, John David Anglin wrote:
> > > >
> > > > > On 2016-01-23, at 1:00 PM, John David Anglin wrote:
> > > > >
> > > > > > WARNING: at block/blk-merge.c:454
> > > > >
> > > > > With linux-image-4.4.0-1-parisc64-smp on c3740, the above
> > > > > warning is the last message I see.
> > > > > Kernel seems to hang at that point. This is warning code:
> > > > >
> > > > > /*
> > > > > * Something must have been wrong if the figured number
> > > > > of
> > > > > * segment is bigger than number of req's physical
> > > > > segments
> > > > > */
> > > > > WARN_ON(nsegs > rq->nr_phys_segments);
> > > >
> > > > On Sep. 12, 2015, I reported the following problem:
> > > >
> > > > http://www.spinics.net/lists/linux-parisc/msg06327.html
> > >
> > > The problem is still, that this bug can only be reproduced at
> > > every boot when then
> > > scsi drivers are built as modules (and in an initrd). I could
> > > never reproduce it when
> > > I booted a kernel with built-in scsi drivers.
> > >
> > > The bug seems to be triggered by(*nsegs)++ command in
> > > __blk_segment_map_sg() in block/blk-merge.c.
> > > I'm testing with the 4.4.2 kernel from debian.
> > > I modified __blk_segment_map_sg() like that:
> > > static inline void
> > > __blk_segment_map_sg(struct request_queue *q, struct bio_vec
> > > *bvec,
> > > struct scatterlist *sglist, struct bio_vec
> > > *bvprv,
> > > struct scatterlist **sg, int *nsegs, int
> > > *cluster)
> > > {
> > >
> > > int nbytes = bvec->bv_len;
> > >
> > > if (*sg && *cluster) {
> > > if ((*sg)->length + nbytes >
> > > queue_max_segment_size(q))
> > > goto new_segment;
> > >
> > > if (!BIOVEC_PHYS_MERGEABLE(bvprv, bvec))
> > > goto new_segment;
> > > if (!BIOVEC_SEG_BOUNDARY(q, bvprv, bvec))
> > > goto new_segment;
> > >
> > > (*sg)->length += nbytes;
> > > } else {
> > > new_segment:
> > > if (*sg && *cluster) {
> > > printk("NEW SEGMENT sg = %p!!!\n", sg);
> > > printk("__blk_segment_map_sg: length = %d,
> > > nbytes = %d, sum = %d > %d\n", (*sg)->length, nbytes, (*sg)
> > > ->length + nbytes, queue_max_segment_size(q));
> > > printk("__blk_segment_map_sg:
> > > BIOVEC_PHYS_MERGEABLE = %d, BIOVEC_SEG_BOUNDARY = %d\n",
> > > BIOVEC_PHYS_MERGEABLE(bvprv, bvec), BIOVEC_SEG_BOUNDARY(q, bvprv,
> > > bvec) );
> > > }
> > > if (!*sg)
> > > *sg = sglist;
> > > else {
> > > /*
> > > * If the driver previously mapped a
> > > shorter
> > > * list, we could see a termination bit
> > > * prematurely unless it fully inits the sg
> > > * table on each mapping. We KNOW that
> > > there
> > > * must be more entries here or the driver
> > > * would be buggy, so force clear the
> > > * termination bit to avoid doing a full
> > > * sg_init_table() in drivers for each
> > > command.
> > > */
> > > sg_unmark_end(*sg);
> > > *sg = sg_next(*sg);
> > > }
> > >
> > > sg_set_page(*sg, bvec->bv_page, nbytes, bvec
> > > ->bv_offset);
> > > (*nsegs)++;
> > > }
> > > *bvprv = *bvec;
> > > }
> > >
> > > The boot log looks then like this:
> > > [ 43.044000] scsi_init_sgtable: count = 1, nents = 1
> > > (there are lots of those before it!)
> > > [ 43.164000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 43.164000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 43.280000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 43.280000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 43.396000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 43.396000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 43.512000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 43.512000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 43.628000] scsi_init_sgtable: nr_phys_segments = 3
> > > [ 43.628000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 43.628000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 43.628000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 43.628000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 43.628000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 43.628000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 43.628000] scsi_init_sgtable: count = 3, nents = 3
> > > [ 44.224000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 44.224000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 44.340000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 44.340000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 44.456000] scsi_init_sgtable: nr_phys_segments = 7
> > > [ 44.456000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 44.456000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 44.456000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 44.456000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 44.456000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 44.456000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 44.456000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 44.456000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 44.456000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 44.456000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 44.456000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 44.456000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 44.456000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 44.456000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 44.456000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 44.456000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 44.456000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 44.456000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 44.456000] scsi_init_sgtable: count = 7, nents = 7
> > > [ 44.456000] timer_interrupt(CPU 0): delayed! cycles 4527081F
> > > rem C6C21 next/now 14E153306E/14E146C44D
> > > [ 46.116000] scsi_init_sgtable: nr_phys_segments = 7
> > > [ 46.116000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 46.116000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 46.116000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 46.116000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 46.116000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 46.116000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 46.116000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 46.116000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 46.116000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 46.116000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 46.116000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 46.116000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 46.116000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 46.116000] __blk_segment_map_sg: length = 8192, nbytes =
> > > 4096, sum = 12288 > 65536
> > > [ 46.116000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 46.116000] NEW SEGMENT sg = 00000000bfca0f98!!!
> > > [ 46.116000] __blk_segment_map_sg: length = 16384, nbytes =
> > > 4096, sum = 20480 > 65536
> > > [ 46.116000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 46.116000] scsi_init_sgtable: count = 7, nents = 7
> > > [ 46.116000] timer_interrupt(CPU 0): delayed! cycles 453F0A77
> > > rem 223089 next/now 152BB6286E/152B93F7E5
> > > [ 47.780000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 47.780000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 47.896000] scsi_init_sgtable: nr_phys_segments = 6
> > > [ 47.896000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 47.896000] __blk_segment_map_sg: length = 61440, nbytes =
> > > 4096, sum = 65536 > 65536
> > > [ 47.896000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 47.896000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 47.896000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 47.896000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 47.896000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 47.896000] __blk_segment_map_sg: length = 4096, nbytes =
> > > 4096, sum = 8192 > 65536
> > > [ 47.896000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 47.896000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 47.896000] __blk_segment_map_sg: length = 8192, nbytes =
> > > 4096, sum = 12288 > 65536
> > > [ 47.896000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 47.896000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 47.896000] __blk_segment_map_sg: length = 8192, nbytes =
> > > 4096, sum = 12288 > 65536
> > > [ 47.896000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 47.896000] scsi_init_sgtable: count = 6, nents = 6
> > > [ 47.896000] timer_interrupt(CPU 0): delayed! cycles 3AB087E2
> > > rem 23E4DE next/now 1570BBD5EE/157097F110
> > > [ 49.324000] scsi_init_sgtable: nr_phys_segments = 1
> > > [ 49.324000] scsi_init_sgtable: count = 1, nents = 1
> > > [ 49.440000] scsi_init_sgtable: nr_phys_segments = 2
> > > [ 49.440000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 49.440000] __blk_segment_map_sg: length = 65536, nbytes =
> > > 4096, sum = 69632 > 65536
> > >
> > > (this is interesting! Here we reach a sum of > 65536 the first
> > > time)
> > >
> > > [ 49.440000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 1,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 49.440000] NEW SEGMENT sg = 000000007fa911e8!!!
> > > [ 49.440000] __blk_segment_map_sg: length = 16384, nbytes =
> > > 4096, sum = 20480 > 65536
> > > [ 49.440000] __blk_segment_map_sg: BIOVEC_PHYS_MERGEABLE = 0,
> > > BIOVEC_SEG_BOUNDARY = 1
> > > [ 49.440000] *** FIXIT *** HELGE: nsegs > rq->nr_phys_segments
> > > = 3 > 2
> > > [ 49.440000] scsi_init_sgtable: count = 3, nents = 2
> > > [ 50.116000] ------------[ cut here ]------------
> > > [ 50.172000] WARNING: at /build/linux-4.4/linux
> > > -4.4.2/drivers/scsi/scsi_lib.c:1104
> > >
> > > (this is usually a BUG(). I changed it to WARN() in the hope it
> > > would work anyway. It didn't.)
> > >
> > > [ 50.260000] Modules linked in: sd_mod sr_mod cdrom ata_generic
> > > ohci_pci ehci_pci ohci_hcd ehci_hcd pata_ns87415 sym53c8xx libata
> > > scsi_transport_spi scsi_mod usbcorep
> > > [ 50.456000] CPU: 0 PID: 70 Comm: systemd-udevd Not tainted
> > > 4.4.0-1-parisc64-smp #5 Debian 4.4.2-2
> > > [ 50.564000] task: 000000007f948b28 ti: 000000007fa90000
> > > task.ti: 000000007fa90000
> > > [ 50.652000]
> > > [ 50.672000] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
> > > [ 50.728000] PSW: 00001000000001001111100100001110 Not tainted
> > > [ 50.796000] r00-03 000000ff0804f90e 00000000409ea2e0
> > > 00000000003e2ee0 000000007fa91140
> > > [ 50.892000] r04-07 00000000003cd000 000000007f914300
> > > 000000007f914b10 0000000000000003
> > > [ 50.988000] r08-11 0000000000000000 000000007f918000
> > > 0000000040bdd6b0 00000000003cd800
> > > [ 51.084000] r12-15 0000000000000000 000000007fa90778
> > > 00000000003cd000 000000007f918000
> > > [ 51.180000] r16-19 0000000000001300 0000000040bdd6b8
> > > 0000000040bdd6bc 0000000040ba2420
> > > [ 51.276000] r20-23 0000000099116e92 0000000000000000
> > > 00000000000002a0 00000000000002ee
> > > [ 51.372000] r24-27 0000000000000000 000000000800000e
> > > 0000000040b60750 00000000409b3ae0
> > > [ 51.468000] r28-31 0000000000000002 000000007fa914f0
> > > 000000007fa911e0 0000000040ba2408
> > > [ 51.564000] sr00-03 0000000000015000 0000000000000000
> > > 0000000000000000 0000000000015000
> > > [ 51.660000] sr04-07 0000000000000000 0000000000000000
> > > 0000000000000000 0000000000000000
> > > [ 51.756000]
> > > [ 51.772000] IASQ: 0000000000000000 0000000000000000 IAOQ:
> > > 00000000003e2f24 00000000003e2f28
> > > [ 51.872000] IIR: 03ffe01f ISR: 0000000010340000 IOR:
> > > 000000fea4691528
> > > [ 51.956000] CPU: 0 CR30: 000000007fa90000 CR31:
> > > 00000000ffff7dff
> > > [ 52.040000] ORIG_R28: 0000000040b60718
> > > [ 52.084000] IAOQ[0]: scsi_init_sgtable+0xfc/0x1b8 [scsi_mod]
> > > [ 52.152000] IAOQ[1]: scsi_init_sgtable+0x100/0x1b8 [scsi_mod]
> > > [ 52.224000] RP(r2): scsi_init_sgtable+0xb8/0x1b8 [scsi_mod]
> > > [ 52.292000] Backtrace:
> > > [ 52.320000] [<00000000003e304c>] scsi_init_io+0x6c/0x258
> > > [scsi_mod]
> > > [ 52.396000] [<000000000087d078>] sd_init_command+0x70/0xec8
> > > [sd_mod]
> > >
> > > In general I think the bug is somehow in blk-merge.c.
> > > But I'm not an expert in that code.
> >
> > The warning was added in this patch sequence:
> > https://lkml.org/lkml/2015/11/23/996
> >
> > Possibly, but above seems to indicate that it could be driver issue
> > as well.
>
>
> I believe this bug was introduced by the following merge:
>
> commit 1081230b748de8f03f37f80c53dfa89feda9b8de
> Merge: df91039 2ca495a
> Author: Linus Torvalds <torvalds@linux-foundation.org>
> Date: Wed Sep 2 13:10:25 2015 -0700
>
> Merge branch 'for-4.3/core' of git://git.kernel.dk/linux-block
>
> Pull core block updates from Jens Axboe:
> "This first core part of the block IO changes contains:
>
> - Cleanup of the bio IO error signaling from Christoph. We
> used to
> rely on the uptodate bit and passing around of an error, now
> we
> store the error in the bio itself.
>
> - Improvement of the above from myself, by shrinking the bio
> size
> down again to fit in two cachelines on x86-64.
>
> - Revert of the max_hw_sectors cap removal from a revision
> again,
> from Jeff Moyer. This caused performance regressions in
> various
> tests. Reinstate the limit, bump it to a more reasonable
> size
> instead.
>
> - Make /sys/block/<dev>/queue/discard_max_bytes writeable, by
> me.
> Most devices have huge trim limits, which can cause nasty
> latencies
> when deleting files. Enable the admin to configure the size
> down.
> We will look into having a more sane default instead of
> UINT_MAX
> sectors.
>
> - Improvement of the SGP gaps logic from Keith Busch.
>
> - Enable the block core to handle arbitrarily sized bios,
> which
> enables a nice simplification of bio_add_page() (which is an
> IO hot
> path). From Kent.
>
> - Improvements to the partition io stats accounting, making it
> faster. From Ming Lei.
>
> - Also from Ming Lei, a basic fixup for overflow of the sysfs
> pending
> file in blk-mq, as well as a fix for a blk-mq timeout race
> condition.
>
> - Ming Lin has been carrying Kents above mentioned patches
> forward
> for a while, and testing them. Ming also did a few fixes
> around
> that.
>
> - Sasha Levin found and fixed a use-after-free problem
> introduced by
> the bio->bi_error changes from Christoph.
>
> - Small blk cgroup cleanup from Viresh Kumar"
>
> * 'for-4.3/core' of git://git.kernel.dk/linux-block: (26 commits)
> blk: Fix bio_io_vec index when checking bvec gaps
> block: Replace SG_GAPS with new queue limits mask
> block: bump BLK_DEF_MAX_SECTORS to 2560
> Revert "block: remove artifical max_hw_sectors cap"
> blk-mq: fix race between timeout and freeing request
> blk-mq: fix buffer overflow when reading sysfs file of
> 'pending'
> Documentation: update notes in biovecs about arbitrarily sized
> bios
> block: remove bio_get_nr_vecs()
> fs: use helper bio_add_page() instead of open coding on
> bi_io_vec
> block: kill merge_bvec_fn() completely
> md/raid5: get rid of bio_fits_rdev()
> md/raid5: split bio for chunk_aligned_read
> block: remove split code in blkdev_issue_{discard,write_same}
> btrfs: remove bio splitting and merge_bvec_fn() calls
> bcache: remove driver private bio splitting code
> block: simplify bio_add_page()
> block: make generic_make_request handle arbitrarily sized bios
> blk-cgroup: Drop unlikely before IS_ERR(_OR_NULL)
> block: don't access bio->bi_error after bio_put()
> block: shrink struct bio down to 2 cache lines again
> ...
If you can bisect it down to the exact commit, I might be able to work
out what's the problem. Otherwise, even in an all modular config, I
can't reproduce this on 4.5-rc4, so it may be fixed upstream (just not
backported).
James
next prev parent reply other threads:[~2016-02-21 3:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-23 18:00 SCSI bug John David Anglin
2016-02-20 20:13 ` John David Anglin
2016-02-20 20:43 ` John David Anglin
2016-02-20 21:59 ` Helge Deller
2016-02-20 22:52 ` John David Anglin
2016-02-21 2:52 ` John David Anglin
2016-02-21 3:47 ` James Bottomley [this message]
2016-02-21 14:45 ` John David Anglin
2016-02-21 18:10 ` James Bottomley
2016-02-21 18:09 ` John David Anglin
2016-02-21 18:13 ` James Bottomley
2016-02-21 18:43 ` John David Anglin
2016-02-21 19:07 ` James Bottomley
2016-02-21 19:36 ` Helge Deller
2016-02-21 20:28 ` James Bottomley
2016-02-21 21:09 ` John David Anglin
2016-02-21 21:17 ` Helge Deller
2016-02-21 21:49 ` James Bottomley
2016-02-21 22:08 ` John David Anglin
2016-02-22 0:53 ` John David Anglin
2016-02-22 3:24 ` John David Anglin
2016-02-23 3:04 ` John David Anglin
2016-02-23 18:06 ` Helge Deller
2016-02-23 19:10 ` John David Anglin
2016-02-21 20:42 ` John David Anglin
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