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Date: Fri, 19 Apr 2013 15:21:55 -0700
From: Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
To: Rob Herring <robherring2@...il.com>
Cc: netdev@...r.kernel.org, Matt Carlson <mcarlson@...adcom.com>,
Michael Chan <mchan@...adcom.com>,
Grant Likely <grant.likely@...retlab.ca>,
linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: tg3: possible irq lock inversion dependency detected
Hi Rob,
On 19.04.2013 [14:23:21 -0500], Rob Herring wrote:
> On 04/19/2013 02:01 PM, Nishanth Aravamudan wrote:
> > Running 3.9-rc7-ish, tripped the following (also being seen in FC19
> > alpha) on ppc64:
> >
> > [ 117.026196] =========================================================
> > [ 117.026216] [ INFO: possible irq lock inversion dependency detected ]
> > [ 117.026238] 3.9.0-rc7+ #8 Not tainted
> > [ 117.026251] ---------------------------------------------------------
> > [ 117.026271] swapper/7/0 just changed the state of lock:
> > [ 117.026286] (&(&tp->lock)->rlock){+.-...}, at: [<c00000000064effc>] .tg3_timer+0x9c/0x10f0
> > [ 117.026334] but this lock took another, SOFTIRQ-unsafe lock in the past:
> > [ 117.026353] (devtree_lock){+.+...}
> >
> > and interrupts could create inverse lock ordering between them.
> >
> > [ 117.026389]
> > other info that might help us debug this:
> > [ 117.026409] Chain exists of:
> > &(&tp->lock)->rlock --> pci_lock --> devtree_lock
> >
> > [ 117.026452] Possible interrupt unsafe locking scenario:
> >
> > [ 117.026472] CPU0 CPU1
> > [ 117.026488] ---- ----
> > [ 117.026503] lock(devtree_lock);
> > [ 117.026521] local_irq_disable();
> > [ 117.026540] lock(&(&tp->lock)->rlock);
> > [ 117.026567] lock(pci_lock);
> > [ 117.026591] <Interrupt>
> > [ 117.026600] lock(&(&tp->lock)->rlock);
> > [ 117.026621]
> > *** DEADLOCK ***
> >
> > [ 117.026644] 1 lock held by swapper/7/0:
> > [ 117.026657] #0: ((&tp->timer)){+.-...}, at: [<c0000000000bbc50>] .call_timer_fn+0x0/0x3e0
> > [ 117.026698]
> > the shortest dependencies between 2nd lock and 1st lock:
> > [ 117.026722] -> (devtree_lock){+.+...} ops: 13864154431488 {
> > [ 117.026758] HARDIRQ-ON-W at:
> > [ 117.026772] SOFTIRQ-ON-W at:
> > [ 117.026786] INITIAL USE at:
> > [ 117.026799] }
> > [ 117.026809] ... key at: [<c00000000159b208>] devtree_lock+0x18/0x48
> > [ 117.026835] ... acquired at:
> >
> > [ 117.026857] -> (pci_lock){......} ops: 3955664879616 {
> > [ 117.026893] INITIAL USE at:
> > [ 117.026906] }
> > [ 117.026915] ... key at: [<c00000000157abe8>] pci_lock+0x18/0x48
> > [ 117.026942] ... acquired at:
> >
> > [ 117.026963] -> (&(&tp->lock)->rlock){+.-...} ops: 154618822656 {
> > [ 117.027001] HARDIRQ-ON-W at:
> > [ 117.027015] IN-SOFTIRQ-W at:
> > [ 117.027029] INITIAL USE at:
> > [ 117.027042] }
> > [ 117.027051] ... key at: [<c0000000023a0311>] __key.48770+0x0/0x8
> > [ 117.027078] ... acquired at:
> >
> > [ 117.027100]
> > stack backtrace:
> > [ 117.027116] Call Trace:
> > [ 117.027129] [c0000003a7c7ad10] [c000000000016ee0] .show_stack+0xd0/0x1f0 (unreliable)
> > [ 117.027161] [c0000003a7c7ade0] [c000000000137d78] .print_irq_inversion_bug+0x298/0x2f0
> > [ 117.027189] [c0000003a7c7ae80] [c000000000137e70] .check_usage_forwards+0xa0/0x150
> > [ 117.027217] [c0000003a7c7af70] [c000000000138b68] .mark_lock+0x258/0x7b0
> > [ 117.027242] [c0000003a7c7b030] [c0000000001396f8] .__lock_acquire+0x638/0x1c20
> > [ 117.027270] [c0000003a7c7b1b0] [c00000000013b480] .lock_acquire+0xb0/0x250
> > [ 117.027296] [c0000003a7c7b290] [c00000000093a1cc] ._raw_spin_lock+0x5c/0xc0
> > [ 117.027321] [c0000003a7c7b320] [c00000000064effc] .tg3_timer+0x9c/0x10f0
> > [ 117.027345] [c0000003a7c7b3d0] [c0000000000bbd0c] .call_timer_fn+0xbc/0x3e0
> > [ 117.027369] [c0000003a7c7b4b0] [c0000000000bc328] .run_timer_softirq+0x2f8/0x440
> > [ 117.027398] [c0000003a7c7b5c0] [c0000000000afef8] .__do_softirq+0x1b8/0x540
> > [ 117.027423] [c0000003a7c7b6f0] [c0000000000b04e8] .irq_exit+0xe8/0x100
> > [ 117.027448] [c0000003a7c7b770] [c000000000020464] .timer_interrupt+0x174/0x510
> > [ 117.027477] [c0000003a7c7b830] [c0000000000024f4] decrementer_common+0x174/0x180
> > [ 117.027509] --- Exception: 901 at .plpar_hcall_norets+0x84/0xd4
> > LR = .check_and_cede_processor+0x48/0x80
> > [ 117.027544] [c0000003a7c7bb20] [c000000000085168] .check_and_cede_processor+0x18/0x80 (unreliable)
> > [ 117.027577] [c0000003a7c7bb90] [c000000000085258] .dedicated_cede_loop+0x88/0x150
> > [ 117.027606] [c0000003a7c7bc50] [c00000000075808c] .cpuidle_enter+0x2c/0x40
> > [ 117.027632] [c0000003a7c7bcc0] [c0000000007589bc] .cpuidle_idle_call+0xfc/0x4e0
> > [ 117.027660] [c0000003a7c7bd70] [c000000000074be8] .pSeries_idle+0x18/0x40
> > [ 117.027685] [c0000003a7c7bde0] [c000000000018ec0] .cpu_idle+0x180/0x360
> > [ 117.027711] [c0000003a7c7bea0] [c00000000095391c] .start_secondary+0x534/0x53c
> > [ 117.027739] [c0000003a7c7bf90] [c0000000000097fc] .start_secondary_prolog+0x10/0x14
> >
>
> It might be related to this commit. Can you revert and try it.
With commit d6d3c4e656513dcea61ce900f0ecb9ca820ee7cd reverted, I do not see the
message above, but I do see:
[ 1.457095] BUG: spinlock bad magic on CPU#0, swapper/0/1
[ 1.457150] lock: devtree_lock+0x0/0x48, .magic: deaf1eed, .owner: swapper/0/1, .owner_cpu: 0
[ 1.457199] Call Trace:
[ 1.457234] [c0000003a7983710] [c000000000016ee0] .show_stack+0xd0/0x1f0 (unreliable)
[ 1.457302] [c0000003a79837e0] [c00000000094f284] .spin_dump+0x94/0xb0
[ 1.457362] [c0000003a7983860] [c00000000049f104] .do_raw_spin_unlock+0x94/0xf0
[ 1.457426] [c0000003a79838e0] [c00000000093b2b4] ._raw_spin_unlock_irqrestore+0x44/0xd0
[ 1.457487] [c0000003a7983970] [c00000000077ddc8] .of_device_is_available+0x58/0x80
[ 1.457551] [c0000003a7983a00] [c00000000007f4f8] .pseries_eeh_of_probe+0x48/0x350
[ 1.457612] [c0000003a7983af0] [c00000000003f084] .traverse_pci_devices+0xa4/0x170
[ 1.457678] [c0000003a7983b90] [c000000000ccd4a0] .eeh_init+0x104/0x170
[ 1.457734] [c0000003a7983c20] [c00000000000b5d4] .do_one_initcall+0x174/0x1f0
[ 1.457798] [c0000003a7983cd0] [c000000000cb502c] .kernel_init_freeable+0x224/0x314
[ 1.457860] [c0000003a7983db0] [c00000000000bd94] .kernel_init+0x24/0x130
[ 1.457917] [c0000003a7983e30] [c00000000000a1f0] .ret_from_kernel_thread+0x64/0x74
Thanks,
Nish
> Author: Thomas Gleixner <tglx@...utronix.de>
> Date: Wed Feb 6 15:30:56 2013 -0500
>
> OF: convert devtree lock from rw_lock to raw spinlock
>
> With the locking cleanup in place (from "OF: Fixup resursive
> locking code paths"), we can now do the conversion from the
> rw_lock to a raw spinlock as required for preempt-rt.
>
> The previous cleanup and this conversion were originally
> separate since they predated when mainline got raw spinlock (in
> commit c2f21ce2e31286a "locking: Implement new raw_spinlock").
>
> So, at that point in time, the cleanup was considered plausible
> for mainline, but not this conversion. In any case, we've kept
> them separate as it makes for easier review and better bisection.
>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> [PG: taken from preempt-rt, update subject & add a commit log]
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> Signed-off-by: Rob Herring <rob.herring@...xeda.com>
>
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