From mboxrd@z Thu Jan 1 00:00:00 1970 From: b32955@freescale.com (Huang Shijie) Date: Fri, 6 Apr 2012 11:35:09 +0800 Subject: Bug in v7_coherent_kern_range() ? In-Reply-To: <20120402111240.GG19011@mudshark.cambridge.arm.com> References: <4F77C9A6.6080601@freescale.com> <20120402111240.GG19011@mudshark.cambridge.arm.com> Message-ID: <4F7E646D.6000302@freescale.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Will: > On Sun, Apr 01, 2012 at 04:21:10AM +0100, Huang Shijie wrote: >> But in some unknown situation, cacheflush() failed and one threads >> (assume A) may hung up in the following code: > [...] > >> multiqueue0:src D 804cd678 0 7328 5963 0x00000001 >> [<804cd678>] (__schedule+0x228/0x760) from [<804d0564>] >> (__down_read+0xa8/0xe0) >> [<804d0564>] (__down_read+0xa8/0xe0) from [<800478c4>] >> (do_page_fault+0xbc/0x480) >> [<800478c4>] (do_page_fault+0xbc/0x480) from [<8003841c>] >> (do_DataAbort+0x34/0x98) >> [<8003841c>] (do_DataAbort+0x34/0x98) from [<8003df10>] >> (__dabt_svc+0x70/0xa0) >> Exception stack(0xbae37ea8 to 0xbae37ef0) >> 7ea0: 31e05000 31e1d000 00000020 0000001f 31e05000 31e1d000 >> 7ec0: bfac86b8 31e05000 31e1d000 bae36000 08100075 31e056fc 31e08000 >> bae37ef0 >> 7ee0: 800424a8 8004a1fc 800f0013 ffffffff >> [<8003df10>] (__dabt_svc+0x70/0xa0) from [<8004a1fc>] >> (v7_coherent_kern_range+0x20/0x80) >> [<8004a1fc>] (v7_coherent_kern_range+0x20/0x80) from [<800424a8>] >> (arm_syscall+0x2a0/0x2c4) >> [<800424a8>] (arm_syscall+0x2a0/0x2c4) from [<8003e500>] >> (ret_fast_syscall+0x0/0x3c) > Please can you try the patch posted here:? > > http://lists.arm.linux.org.uk/lurker/message/20111107.173344.f738392e.en.html I tested this patch. It fixed this bug. This bug did not occur any more. But my system still hung at futex. I think the futex issue is another bug.(will this patch affect the futex?) So : Tested-by: Huang Shijie BR Huang Shijie > If it fixes your problem, please consider giving a tested-by. > > Will >