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Date: Tue, 31 Mar 2020 15:42:49 +0200 From: Sebastian Andrzej Siewior <bigeasy@...utronix.de> To: Geert Uytterhoeven <geert@...ux-m68k.org> Cc: Peter Zijlstra <peterz@...radead.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>, Will Deacon <will@...nel.org>, "Paul E . McKenney" <paulmck@...nel.org>, Joel Fernandes <joel@...lfernandes.org>, Steven Rostedt <rostedt@...dmis.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, Russell King <rmk+kernel@...linux.org.uk>, Catalin Marinas <catalin.marinas@....com> Subject: Re: [PATCH 6/9] lockdep: Introduce wait-type checks On 2020-03-31 15:25:21 [+0200], Geert Uytterhoeven wrote: > Hi all, Hi Geert, > On arm64 (e.g. R-Car H3 ES2.0): > > +============================= > +[ BUG: Invalid wait context ] > +5.6.0-salvator-x-09423-gb29514ba13a9c459-dirty #679 Not tainted > +----------------------------- > +swapper/5/0 is trying to lock: > +ffffff86ff76f398 (&pool->lock){..-.}-{3:3}, at: __queue_work+0x134/0x430 The pool->lock is not yet converted. … > On arm32 (e.g SH-Mobile AG5, using Cortex-A9 TWD): > > +============================= > +[ BUG: Invalid wait context ] > +5.6.0-kzm9g-09424-g2698719b4c4f35db-dirty #253 Not tainted > +----------------------------- > +swapper/0/0 is trying to lock: > +dfbc5250 (&pool->lock){..-.}-{3:3}, at: __queue_work+0x14c/0x4d0 same issue. > I also see it on other arm32 platforms using Renesas-specific timers, > but I'll ignore those until the issues with "standard" ARM timers have > been resolved ;-) There are some known culprits, like the work infrastructure. The printk is another one. From Kconfig: | NOTE: There are known nesting problems. So if you enable this | option expect lockdep splats until these problems have been fully | addressed which is work in progress. This config switch allows to | identify and analyze these problems. It will be removed and the | check permanentely enabled once the main issues have been fixed. > Thanks! > > Gr{oetje,eeting}s, > > Geert > > Sebastian
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