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Message-ID: <87r3tkfw3b.fsf@kamboji.qca.qualcomm.com> Date: Fri, 20 Feb 2015 17:20:40 +0200 From: Kalle Valo <kvalo@....qualcomm.com> To: Josh Cartwright <joshc@...com> CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "John W. Linville" <linville@...driver.com>, <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>, Jason Liu <r64343@...escale.com> Subject: Re: [PATCH -stable] ath6kl: fix struct hif_scatter_req list handling Josh Cartwright <joshc@...com> writes: > From: Kalle Valo <kvalo@....qualcomm.com> > > commit 31b9cc9a873dcab161999622314f98a75d838975 upstream. > > Jason noticed that with Yocto GCC 4.8.1 ath6kl crashes with this iperf command: > > iperf -c $TARGET_IP -i 5 -t 50 -w 1M > > The crash was: > > Unable to handle kernel paging request at virtual address 1a480000 > pgd = 80004000 > [1a480000] *pgd=00000000 > Internal error: Oops: 805 [#1] SMP ARM > Modules linked in: ath6kl_sdio ath6kl_core [last unloaded: ath6kl_core] > CPU: 0 PID: 1953 Comm: kworker/u4:0 Not tainted 3.10.9-1.0.0_alpha+dbf364b #1 > Workqueue: ath6kl ath6kl_sdio_write_async_work [ath6kl_sdio] > task: dcc9a680 ti: dc9ae000 task.ti: dc9ae000 > PC is at v7_dma_clean_range+0x20/0x38 > LR is at dma_cache_maint_page+0x50/0x54 > pc : [<8001a6f8>] lr : [<800170fc>] psr: 20000093 > sp : dc9afcf8 ip : 8001a748 fp : 00000004 > r10: 00000000 r9 : 00000001 r8 : 00000000 > r7 : 00000001 r6 : 00000000 r5 : 80cb7000 r4 : 03f9a480 > r3 : 0000001f r2 : 00000020 r1 : 1a480000 r0 : 1a480000 > Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel > Control: 10c53c7d Table: 6cc5004a DAC: 00000015 > Process kworker/u4:0 (pid: 1953, stack limit = 0xdc9ae238) > Stack: (0xdc9afcf8 to 0xdc9b0000) > fce0: 80c9b29c 00000000 > fd00: 00000000 80017134 8001a748 dc302ac0 00000000 00000000 dc454a00 80c12ed8 > fd20: dc115410 80017238 00000000 dc454a10 00000001 80017588 00000001 00000000 > fd40: 00000000 dc302ac0 dc9afe38 dc9afe68 00000004 80c12ed8 00000000 dc454a00 > fd60: 00000004 80436f88 00000000 00000000 00000600 0000ffff 0000000c 80c113c4 > fd80: 80c9b29c 00000001 00000004 dc115470 60000013 dc302ac0 dc46e000 dc302800 > fda0: dc9afe10 dc302b78 60000013 dc302ac0 dc46e000 00000035 dc46e5b0 80438c90 > fdc0: dc9afe10 dc302800 dc302800 dc9afe68 dc9afe38 80424cb4 00000005 dc9afe10 > fde0: dc9afe20 80424de8 dc9afe10 dc302800 dc46e910 80424e90 dc473c00 dc454f00 > fe00: 000001b5 7f619d64 dcc7c830 00000000 00000000 dc9afe38 dc9afe68 00000000 > fe20: 00000000 00000000 dc9afe28 dc9afe28 80424d80 00000000 00000035 9cac0034 > fe40: 00000000 00000000 00000000 00000000 000001b5 00000000 00000000 00000000 > fe60: dc9afe68 dc9afe10 3b9aca00 00000000 00000080 00000034 00000000 00000100 > fe80: 00000000 00000000 dc9afe10 00000004 dc454a00 00000000 dc46e010 dc46e96c > fea0: dc46e000 dc46e964 00200200 00100100 dc46e910 7f619ec0 00000600 80c0e770 > fec0: dc15a900 dcc7c838 00000000 dc46e954 8042d434 dcc44680 dc46e954 dc004400 > fee0: dc454500 00000000 00000000 dc9ae038 dc004400 8003c450 dcc44680 dc004414 > ff00: dc46e954 dc454500 00000001 dcc44680 dc004414 dcc44698 dc9ae000 dc9ae030 > ff20: 00000001 dc9ae000 dc004400 8003d158 8003d020 00000000 00000000 80c53941 > ff40: dc9aff64 dcb71ea0 00000000 dcc44680 8003d020 00000000 00000000 00000000 > ff60: 00000000 80042480 00000000 00000000 000000f8 dcc44680 00000000 00000000 > ff80: dc9aff80 dc9aff80 00000000 00000000 dc9aff90 dc9aff90 dc9affac dcb71ea0 > ffa0: 800423cc 00000000 00000000 8000e018 00000000 00000000 00000000 00000000 > ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000 > [<8001a6f8>] (v7_dma_clean_range+0x20/0x38) from [<800170fc>] (dma_cache_maint_page+0x50/0x54) > [<800170fc>] (dma_cache_maint_page+0x50/0x54) from [<80017134>] (__dma_page_cpu_to_dev+0x34/0x9c) > [<80017134>] (__dma_page_cpu_to_dev+0x34/0x9c) from [<80017238>] (arm_dma_map_page+0x64/0x68) > [<80017238>] (arm_dma_map_page+0x64/0x68) from [<80017588>] (arm_dma_map_sg+0x7c/0xf4) > [<80017588>] (arm_dma_map_sg+0x7c/0xf4) from [<80436f88>] (sdhci_send_command+0x894/0xe00) > [<80436f88>] (sdhci_send_command+0x894/0xe00) from [<80438c90>] (sdhci_request+0xc0/0x1ec) > [<80438c90>] (sdhci_request+0xc0/0x1ec) from [<80424cb4>] (mmc_start_request+0xb8/0xd4) > [<80424cb4>] (mmc_start_request+0xb8/0xd4) from [<80424de8>] (__mmc_start_req+0x60/0x84) > [<80424de8>] (__mmc_start_req+0x60/0x84) from [<80424e90>] (mmc_wait_for_req+0x10/0x20) > [<80424e90>] (mmc_wait_for_req+0x10/0x20) from [<7f619d64>] (ath6kl_sdio_scat_rw.isra.10+0x1dc/0x240 [ath6kl_sdio]) > [<7f619d64>] (ath6kl_sdio_scat_rw.isra.10+0x1dc/0x240 [ath6kl_sdio]) from [<7f619ec0>] (ath6kl_sdio_write_async_work+0x5c/0x104 [ath6kl_sdio]) > [<7f619ec0>] (ath6kl_sdio_write_async_work+0x5c/0x104 [ath6kl_sdio]) from [<8003c450>] (process_one_work+0x10c/0x370) > [<8003c450>] (process_one_work+0x10c/0x370) from [<8003d158>] (worker_thread+0x138/0x3fc) > [<8003d158>] (worker_thread+0x138/0x3fc) from [<80042480>] (kthread+0xb4/0xb8) > [<80042480>] (kthread+0xb4/0xb8) from [<8000e018>] (ret_from_fork+0x14/0x3c) > Code: e1a02312 e2423001 e1c00003 f57ff04f (ee070f3a) > ---[ end trace 0c038f0b8e0b67a3 ]--- > Kernel panic - not syncing: Fatal exception > > Jason's analysis: > > "The GCC 4.8.1 compiler will not do the for-loop till scat_entries, instead, > it only run one round loop. This may be caused by that the GCC 4.8.1 thought > that the scat_list only have one item and then no need to do full iteration, > but this is simply wrong by looking at the assebly code. This will cause the sg > buffer not get set when scat_entries > 1 and thus lead to kernel panic. > > Note: This issue not observed with GCC 4.7.2, only found on the GCC 4.8.1)" > > Fix this by using the normal [0] style for defining unknown number of list > entries following the struct. This also fixes corruption with scat_q_depth, which > was mistankely added to the end of struct and overwritten if there were more > than item in the scat list. > > Reported-by: Jason Liu <r64343@...escale.com> > Tested-by: Jason Liu <r64343@...escale.com> > Signed-off-by: Kalle Valo <kvalo@....qualcomm.com> > --- > We ran into this issue in the 3.14.y stable tree which has been fixed upstream > since 3.16. Please consider pulling it back to 3.14.y at least; it may be > relevant further back, but it isn't clear when the issue first cropped up. I'm > hoping Kalle can comment. I agree, it would be good to get this to stable. -- Kalle Valo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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