From: Michael Ellerman <mpe@ellerman.id.au>
To: Andreas Schwab <schwab@linux-m68k.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
maple-tree@lists.infradead.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2 1/2] maple_tree: Disable mas_wr_append() when other readers are possible
Date: Thu, 31 Aug 2023 15:37:02 +1000 [thread overview]
Message-ID: <87y1hr22o1.fsf@mail.lhotse> (raw)
In-Reply-To: <87bkeotin8.fsf@igel.home>
Andreas Schwab <schwab@linux-m68k.org> writes:
> This breaks booting on ppc32:
Does enabling CONFIG_DEBUG_ATOMIC_SLEEP fix the crash? It did for me on
qemu.
cheers
> Kernel attemptd to writ user page (1ff0) - exploit attempt? (uid: 0)
> BUG: Unable to handle kernel data access on write at 0x00001ff0
> Faulting instruction address: 0xc0009554
> Vector: 300 (Data Access) at [c0b09d10]
> pc: c0009554: do_softirq_own_stack+0x18/0x30
> lr: c004f480: __irq_exit_rcu+0x70/0xc0
> sp: c0b09dd0
> msr: 1032
> dar: 1ff0
> dsisr: 42000000
> current = 0xc0a08360
> pid = 0, comm = swapper
> Linux version 6.5.0 ...
> enter ? for help
> [c0b09de0] c00ff480 __irq_exit_rcu+0x70/0xc0
> [c0b09df0] c0005a98 Decrementer_virt+0x108/0x10c
> --- Exception: 900 (Decrementer) at c06cfa0c __schedule+0x4fc/0x510
> [c0b09ec0] c06cf75c __schedule+0x1cc/0x510 (unreliable)
> [c0b09ef0] c06cfc90 __cond_resched+0x2c/0x54
> [c0b09f00] c06d07f8 mutex_lock_killable+0x18/0x5c
> [c0b09f10] c013c404 pcpu_alloc+0x110/0x4dc
> [c0b09f70] c000cc34 alloc_descr.isra.18+0x48/0x144
> [c0b09f90] c0988aa0 early_irq_init+0x64/0x8c
> [c0b09fa0] c097a5a4 start_kernel+0x5b4/0x7b0
> [c0b09ff0] 00003dc0
> mon>
>
> --
> Andreas Schwab, schwab@linux-m68k.org
> GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1
> "And now for something completely different."
next prev parent reply other threads:[~2023-08-31 5:37 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-19 0:43 [PATCH v2 0/2] maple_tree: mas_wr_append() fix ups Liam R. Howlett
2023-08-19 0:43 ` [PATCH v2 1/2] maple_tree: Disable mas_wr_append() when other readers are possible Liam R. Howlett
2023-08-29 16:42 ` Geert Uytterhoeven
2023-08-31 5:39 ` Michael Ellerman
2023-08-31 8:25 ` Geert Uytterhoeven
2023-08-31 8:45 ` Peng Zhang
2023-08-31 9:43 ` Geert Uytterhoeven
2023-09-06 15:23 ` Liam R. Howlett
2023-09-06 17:23 ` Paul E. McKenney
2023-09-06 17:29 ` Liam R. Howlett
2023-09-06 18:02 ` Paul E. McKenney
2023-09-11 23:54 ` Liam R. Howlett
2023-09-12 8:14 ` Paul E. McKenney
2023-09-12 8:23 ` Geert Uytterhoeven
2023-09-12 8:30 ` Paul E. McKenney
2023-09-12 8:34 ` Geert Uytterhoeven
2023-09-12 10:00 ` Paul E. McKenney
2023-09-12 13:56 ` Liam R. Howlett
2023-09-12 14:29 ` Liam R. Howlett
2023-09-12 15:08 ` Paul E. McKenney
2023-09-12 15:27 ` Christophe Leroy
2023-09-12 15:49 ` Liam R. Howlett
2023-09-12 15:07 ` Paul E. McKenney
2023-09-12 15:44 ` Liam R. Howlett
2023-09-12 16:49 ` Paul E. McKenney
2023-09-12 17:02 ` Christophe Leroy
2023-09-12 17:09 ` Christophe Leroy
2023-09-12 17:38 ` Liam R. Howlett
2023-09-13 13:14 ` Geert Uytterhoeven
2023-09-13 13:24 ` Liam R. Howlett
2023-09-13 13:26 ` Geert Uytterhoeven
2023-09-12 14:37 ` Christophe Leroy
2023-09-12 14:10 ` Matthew Wilcox
2023-09-12 14:17 ` Liam R. Howlett
2023-09-06 19:06 ` Geert Uytterhoeven
2023-09-11 12:27 ` Linux regression tracking #adding (Thorsten Leemhuis)
2023-10-16 8:29 ` Linux regression tracking #update (Thorsten Leemhuis)
2023-08-30 19:49 ` Andreas Schwab
2023-08-31 5:37 ` Michael Ellerman [this message]
2023-08-31 19:01 ` Andreas Schwab
2023-09-12 18:15 ` Andreas Schwab
2023-09-12 19:09 ` Liam R. Howlett
2023-09-12 20:01 ` Andreas Schwab
2023-08-19 0:43 ` [PATCH v2 2/2] maple_tree: Clean up mas_wr_append() Liam R. Howlett
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