* Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc [not found] <20170228041117.hbqqyczf5bnypqmc@wfg-t540p.sh.intel.com> @ 2017-02-28 7:48 ` Peter Zijlstra 2017-02-28 8:17 ` Peter Zijlstra 1 sibling, 0 replies; 6+ messages in thread From: Peter Zijlstra @ 2017-02-28 7:48 UTC (permalink / raw) To: Fengguang Wu; +Cc: linux-block, Omar Sandoval, Jens Axboe, LKP On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote: > Hello, > > FYI, an old blk_mq bug triggers new warnings on this commit. It's very > reproducible and you may try the attached reproduce-* script. > > https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master > > commit 29dee3c03abce04cd527878ef5f9e5f91b7b83f4 > Author: Peter Zijlstra <peterz@infradead.org> > AuthorDate: Fri Feb 10 16:27:52 2017 +0100 > Commit: Ingo Molnar <mingo@kernel.org> > CommitDate: Fri Feb 24 09:02:10 2017 +0100 > > locking/refcounts: Out-of-line everything > > Linus asked to please make this real C code. > > And since size then isn't an issue what so ever anymore, remove the > debug knob and make all WARN()s unconditional. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ I suspect that if you revert, but enable CONFIG_DEBUG_REFCOUNT you'd have gotten the same splats.. I'll go have a look though, something looks buggered. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc [not found] <20170228041117.hbqqyczf5bnypqmc@wfg-t540p.sh.intel.com> 2017-02-28 7:48 ` [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc Peter Zijlstra @ 2017-02-28 8:17 ` Peter Zijlstra 2017-02-28 8:35 ` Fengguang Wu 2017-02-28 8:38 ` Peter Zijlstra 1 sibling, 2 replies; 6+ messages in thread From: Peter Zijlstra @ 2017-02-28 8:17 UTC (permalink / raw) To: Fengguang Wu Cc: linux-block, Omar Sandoval, Jens Axboe, LKP, Greg Kroah-Hartman On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote: > Hello, > > FYI, an old blk_mq bug triggers new warnings on this commit. It's very > reproducible and you may try the attached reproduce-* script. > [ 4.447772] kobject (ffff88001c041f10): tried to init an initialized object, something is seriously wrong. > [ 4.453395] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-01216-g29dee3c #2 > [ 4.455534] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 > [ 4.458252] Workqueue: events_unbound async_run_entry_fn > [ 4.459708] Call Trace: > [ 4.460611] dump_stack+0x19/0x27 > [ 4.461652] kobject_init+0xda/0xf0 > [ 4.462731] blk_mq_register_dev+0x31/0x150 > [ 4.463990] blk_register_queue+0x205/0x250 > [ 4.465217] device_add_disk+0x1ab/0x710 > [ 4.466384] sd_probe_async+0x11c/0x1e0 > [ 4.467544] async_run_entry_fn+0xbd/0x220 > [ 4.468760] process_one_work+0x4a7/0x990 > [ 4.469938] ? process_one_work+0x348/0x990 > [ 4.471168] worker_thread+0x342/0x8a0 > [ 4.472300] ? process_one_work+0x990/0x990 > [ 4.473540] kthread+0x188/0x190 > [ 4.474557] ? kthread_create_on_node+0x40/0x40 > [ 4.475850] ret_from_fork+0x31/0x40 So this was pre-existing wreckage? If so, that needs to be sorted first. Because if the kobject stuff is broken, there's no way the refcount stuff can begin to work. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc 2017-02-28 8:17 ` Peter Zijlstra @ 2017-02-28 8:35 ` Fengguang Wu 2017-02-28 8:52 ` Omar Sandoval 2017-02-28 8:38 ` Peter Zijlstra 1 sibling, 1 reply; 6+ messages in thread From: Fengguang Wu @ 2017-02-28 8:35 UTC (permalink / raw) To: Peter Zijlstra Cc: linux-block, Omar Sandoval, Jens Axboe, LKP, Greg Kroah-Hartman On Tue, Feb 28, 2017 at 09:17:11AM +0100, Peter Zijlstra wrote: >On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote: >> Hello, >> >> FYI, an old blk_mq bug triggers new warnings on this commit. It's very >> reproducible and you may try the attached reproduce-* script. > >> [ 4.447772] kobject (ffff88001c041f10): tried to init an initialized object, something is seriously wrong. >> [ 4.453395] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-01216-g29dee3c #2 >> [ 4.455534] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 >> [ 4.458252] Workqueue: events_unbound async_run_entry_fn >> [ 4.459708] Call Trace: >> [ 4.460611] dump_stack+0x19/0x27 >> [ 4.461652] kobject_init+0xda/0xf0 >> [ 4.462731] blk_mq_register_dev+0x31/0x150 >> [ 4.463990] blk_register_queue+0x205/0x250 >> [ 4.465217] device_add_disk+0x1ab/0x710 >> [ 4.466384] sd_probe_async+0x11c/0x1e0 >> [ 4.467544] async_run_entry_fn+0xbd/0x220 >> [ 4.468760] process_one_work+0x4a7/0x990 >> [ 4.469938] ? process_one_work+0x348/0x990 >> [ 4.471168] worker_thread+0x342/0x8a0 >> [ 4.472300] ? process_one_work+0x990/0x990 >> [ 4.473540] kthread+0x188/0x190 >> [ 4.474557] ? kthread_create_on_node+0x40/0x40 >> [ 4.475850] ret_from_fork+0x31/0x40 > >So this was pre-existing wreckage? If so, that needs to be sorted first. >Because if the kobject stuff is broken, there's no way the refcount >stuff can begin to work. Yeah it's old bug that should have existed for quite some time. It's not quite related to the refcount work, just hoping the new warning might serve as new clues to help debugging the blk_mq bug. Thanks, Fengguang ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc 2017-02-28 8:35 ` Fengguang Wu @ 2017-02-28 8:52 ` Omar Sandoval 0 siblings, 0 replies; 6+ messages in thread From: Omar Sandoval @ 2017-02-28 8:52 UTC (permalink / raw) To: Fengguang Wu Cc: Peter Zijlstra, linux-block, Omar Sandoval, Jens Axboe, LKP, Greg Kroah-Hartman On Tue, Feb 28, 2017 at 04:35:08PM +0800, Fengguang Wu wrote: > On Tue, Feb 28, 2017 at 09:17:11AM +0100, Peter Zijlstra wrote: > > On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote: > > > Hello, > > > > > > FYI, an old blk_mq bug triggers new warnings on this commit. It's very > > > reproducible and you may try the attached reproduce-* script. > > > > > [ 4.447772] kobject (ffff88001c041f10): tried to init an initialized object, something is seriously wrong. > > > [ 4.453395] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-01216-g29dee3c #2 > > > [ 4.455534] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 > > > [ 4.458252] Workqueue: events_unbound async_run_entry_fn > > > [ 4.459708] Call Trace: > > > [ 4.460611] dump_stack+0x19/0x27 > > > [ 4.461652] kobject_init+0xda/0xf0 > > > [ 4.462731] blk_mq_register_dev+0x31/0x150 > > > [ 4.463990] blk_register_queue+0x205/0x250 > > > [ 4.465217] device_add_disk+0x1ab/0x710 > > > [ 4.466384] sd_probe_async+0x11c/0x1e0 > > > [ 4.467544] async_run_entry_fn+0xbd/0x220 > > > [ 4.468760] process_one_work+0x4a7/0x990 > > > [ 4.469938] ? process_one_work+0x348/0x990 > > > [ 4.471168] worker_thread+0x342/0x8a0 > > > [ 4.472300] ? process_one_work+0x990/0x990 > > > [ 4.473540] kthread+0x188/0x190 > > > [ 4.474557] ? kthread_create_on_node+0x40/0x40 > > > [ 4.475850] ret_from_fork+0x31/0x40 > > > > So this was pre-existing wreckage? If so, that needs to be sorted first. > > Because if the kobject stuff is broken, there's no way the refcount > > stuff can begin to work. > > Yeah it's old bug that should have existed for quite some time. > It's not quite related to the refcount work, just hoping the new > warning might serve as new clues to help debugging the blk_mq bug. > > Thanks, > Fengguang Ming Lei posted a series to fix this here [1]. I haven't gotten around to testing it, but it'd be great if you could try it, too. http://marc.info/?l=linux-block&m=148775846217069&w=2 ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc 2017-02-28 8:17 ` Peter Zijlstra 2017-02-28 8:35 ` Fengguang Wu @ 2017-02-28 8:38 ` Peter Zijlstra 2017-02-28 9:45 ` Peter Zijlstra 1 sibling, 1 reply; 6+ messages in thread From: Peter Zijlstra @ 2017-02-28 8:38 UTC (permalink / raw) To: Fengguang Wu Cc: linux-block, Omar Sandoval, Jens Axboe, LKP, Greg Kroah-Hartman On Tue, Feb 28, 2017 at 09:17:11AM +0100, Peter Zijlstra wrote: > On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote: > > Hello, > > > > FYI, an old blk_mq bug triggers new warnings on this commit. It's very > > reproducible and you may try the attached reproduce-* script. > > > [ 4.447772] kobject (ffff88001c041f10): tried to init an initialized object, something is seriously wrong. > > [ 4.453395] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-01216-g29dee3c #2 > > [ 4.455534] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 > > [ 4.458252] Workqueue: events_unbound async_run_entry_fn > > [ 4.459708] Call Trace: > > [ 4.460611] dump_stack+0x19/0x27 > > [ 4.461652] kobject_init+0xda/0xf0 > > [ 4.462731] blk_mq_register_dev+0x31/0x150 > > [ 4.463990] blk_register_queue+0x205/0x250 > > [ 4.465217] device_add_disk+0x1ab/0x710 > > [ 4.466384] sd_probe_async+0x11c/0x1e0 > > [ 4.467544] async_run_entry_fn+0xbd/0x220 > > [ 4.468760] process_one_work+0x4a7/0x990 > > [ 4.469938] ? process_one_work+0x348/0x990 > > [ 4.471168] worker_thread+0x342/0x8a0 > > [ 4.472300] ? process_one_work+0x990/0x990 > > [ 4.473540] kthread+0x188/0x190 > > [ 4.474557] ? kthread_create_on_node+0x40/0x40 > > [ 4.475850] ret_from_fork+0x31/0x40 > > So this was pre-existing wreckage? If so, that needs to be sorted first. > Because if the kobject stuff is broken, there's no way the refcount > stuff can begin to work. Google just found me: https://lkml.kernel.org/r/1487758442-5855-2-git-send-email-tom.leiming@gmail.com Let me see if that works. ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc 2017-02-28 8:38 ` Peter Zijlstra @ 2017-02-28 9:45 ` Peter Zijlstra 0 siblings, 0 replies; 6+ messages in thread From: Peter Zijlstra @ 2017-02-28 9:45 UTC (permalink / raw) To: Fengguang Wu Cc: linux-block, Omar Sandoval, Jens Axboe, LKP, Greg Kroah-Hartman On Tue, Feb 28, 2017 at 09:38:04AM +0100, Peter Zijlstra wrote: > On Tue, Feb 28, 2017 at 09:17:11AM +0100, Peter Zijlstra wrote: > > On Tue, Feb 28, 2017 at 12:11:17PM +0800, Fengguang Wu wrote: > > > Hello, > > > > > > FYI, an old blk_mq bug triggers new warnings on this commit. It's very > > > reproducible and you may try the attached reproduce-* script. > > > > > [ 4.447772] kobject (ffff88001c041f10): tried to init an initialized object, something is seriously wrong. > > > [ 4.453395] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted 4.10.0-01216-g29dee3c #2 > > > [ 4.455534] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 > > > [ 4.458252] Workqueue: events_unbound async_run_entry_fn > > > [ 4.459708] Call Trace: > > > [ 4.460611] dump_stack+0x19/0x27 > > > [ 4.461652] kobject_init+0xda/0xf0 > > > [ 4.462731] blk_mq_register_dev+0x31/0x150 > > > [ 4.463990] blk_register_queue+0x205/0x250 > > > [ 4.465217] device_add_disk+0x1ab/0x710 > > > [ 4.466384] sd_probe_async+0x11c/0x1e0 > > > [ 4.467544] async_run_entry_fn+0xbd/0x220 > > > [ 4.468760] process_one_work+0x4a7/0x990 > > > [ 4.469938] ? process_one_work+0x348/0x990 > > > [ 4.471168] worker_thread+0x342/0x8a0 > > > [ 4.472300] ? process_one_work+0x990/0x990 > > > [ 4.473540] kthread+0x188/0x190 > > > [ 4.474557] ? kthread_create_on_node+0x40/0x40 > > > [ 4.475850] ret_from_fork+0x31/0x40 > > > > So this was pre-existing wreckage? If so, that needs to be sorted first. > > Because if the kobject stuff is broken, there's no way the refcount > > stuff can begin to work. > > Google just found me: > > https://lkml.kernel.org/r/1487758442-5855-2-git-send-email-tom.leiming@gmail.com > > Let me see if that works. Yes, those patches cure the issue. ^ permalink raw reply [flat|nested] 6+ messages in thread
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2017-02-28 7:48 ` [blk_mq_register_hctx] 29dee3c03a WARNING: CPU: 0 PID: 5 at lib/refcount.c:114 refcount_inc Peter Zijlstra
2017-02-28 8:17 ` Peter Zijlstra
2017-02-28 8:35 ` Fengguang Wu
2017-02-28 8:52 ` Omar Sandoval
2017-02-28 8:38 ` Peter Zijlstra
2017-02-28 9:45 ` Peter Zijlstra
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