linux-kernel - Re: [PATCH v2] of: unittest: Disable interrupt node tests for old world MAC systems

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Message-ID: <20180927142730.GA27916@bogus>
Date:   Thu, 27 Sep 2018 09:27:30 -0500
From:   Rob Herring <robh@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Frank Rowand <frowand.list@...il.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] of: unittest: Disable interrupt node tests for old
 world MAC systems

On Tue, Sep 25, 2018 at 09:06:24PM -0700, Guenter Roeck wrote:
> On systems with OF_IMAP_OLDWORLD_MAC set in of_irq_workarounds, the
> devicetree interrupt parsing code is different, causing unit tests of
> devicetree interrupt nodes to fail. Due to a bug in unittest code, which
> tries to dereference an uninitialized pointer, this results in a crash.
> 
> OF: /testcase-data/phandle-tests/consumer-a: arguments longer than property
> Unable to handle kernel paging request for data at address 0x00bc616e
> Faulting instruction address: 0xc08e9468
> Oops: Kernel access of bad area, sig: 11 [#1]
> BE PREEMPT PowerMac
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper Not tainted 4.14.72-rc1-yocto-standard+ #1
> task: cf8e0000 task.stack: cf8da000
> NIP:  c08e9468 LR: c08ea5bc CTR: c08ea5ac
> REGS: cf8dbb50 TRAP: 0300   Not tainted  (4.14.72-rc1-yocto-standard+)
> MSR:  00001032 <ME,IR,DR,RI>  CR: 82004044  XER: 00000000
> DAR: 00bc616e DSISR: 40000000
> GPR00: c08ea5bc cf8dbc00 cf8e0000 c13ca517 c13ca517 c13ca8a0 00000066 00000002
> GPR08: 00000063 00bc614e c0b05865 000affff 82004048 00000000 c00047f0 00000000
> GPR16: c0a80000 c0a9cc34 c13ca517 c0ad1134 05ffffff 000affff c0b05860 c0abeef8
> GPR24: cecec278 cecec278 c0a8c4d0 c0a885e0 c13ca8a0 05ffffff c13ca8a0 c13ca517
> 
> NIP [c08e9468] device_node_gen_full_name+0x30/0x15c
> LR [c08ea5bc] device_node_string+0x190/0x3c8
> Call Trace:
> [cf8dbc00] [c007f670] trace_hardirqs_on_caller+0x118/0x1fc (unreliable)
> [cf8dbc40] [c08ea5bc] device_node_string+0x190/0x3c8
> [cf8dbcb0] [c08eb794] pointer+0x25c/0x4d0
> [cf8dbd00] [c08ebcbc] vsnprintf+0x2b4/0x5ec
> [cf8dbd60] [c08ec00c] vscnprintf+0x18/0x48
> [cf8dbd70] [c008e268] vprintk_store+0x4c/0x22c
> [cf8dbda0] [c008ecac] vprintk_emit+0x94/0x130
> [cf8dbdd0] [c008ff54] printk+0x5c/0x6c
> [cf8dbe10] [c0b8ddd4] of_unittest+0x2220/0x26f8
> [cf8dbea0] [c0004434] do_one_initcall+0x4c/0x184
> [cf8dbf00] [c0b4534c] kernel_init_freeable+0x13c/0x1d8
> [cf8dbf30] [c0004814] kernel_init+0x24/0x118
> [cf8dbf40] [c0013398] ret_from_kernel_thread+0x5c/0x64
> 
> The problem was observed when running a qemu test for the g3beige machine
> with devicetree unittests enabled.
> 
> Disable interrupt node tests on affected systems to avoid both false
> unittest failures and the crash.
> 
> With this patch in place, unittest on the affected system passes with
> the following message.
> 
> 	dt-test ### end of unittest - 144 passed, 0 failed
> 
> Fixes: 53a42093d96ef ("of: Add device tree selftests")
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v2: Do not use goto to skip tests.
>     Provide test log in commit message.
> 
>  drivers/of/unittest.c | 26 ++++++++++++++++++--------
>  1 file changed, 18 insertions(+), 8 deletions(-)

Applied.

Rob