On 10/12/13 14:44 +0100, Gerald Schaefer wrote: > Hi, > > During network stress test with CONFIG_DMA_API_DEBUG=y we get the following > message on the server side: > > [57523.955982] mlx4_core 0000:00:00.0: DMA-API: device driver tries to sync > DMA memory it has not allocated [device address=0x0000000143d2c202] > [size=1526 bytes] > [57523.956018] ------------[ cut here ]------------ > [57523.956021] WARNING: at > /home/dailybuild/builder/packages/BUILD/linux-3.12.3-20131209/lib/dma-debug.c:986 > [57523.956022] Modules linked in: mlx4_en dm_multipath scsi_dh mlx4_core > eadm_sch dm_mod lcs autofs4 > [57523.956034] CPU: 3 PID: 20 Comm: ksoftirqd/3 Not tainted > 3.12.3-65.x.20131209-s390xdefault #1 > [57523.956037] task: 000000026f47cb60 ti: 000000026f484000 task.ti: > 000000026f484000 > [57523.956044] Krnl PSW : 0404e00180000000 00000000004a0422 > (check_sync+0xf2/0x52c) > [57523.956047] R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 > EA:3 > [57523.956047] Krnl GPRS: 0000000000000111 000000008b767e9c 0000000000000092 > 0000000000000000 > [57523.956051] 00000000004a041e 0000000000000000 00000000000005f6 > 0000000143d2c202 > [57523.956053] 000000026f487a98 0000000000000001 0000000000a71144 > 000000026f10dd60 > [57523.956055] 0000000000000000 000000000075bb18 00000000004a041e > 000000026f487980 > [57523.956064] Krnl Code: 00000000004a0412: c020002143d7 larl > %r2,8c8bc0 > [57523.956064] 00000000004a0418: c0e50012717a brasl > %r14,6ee70c > [57523.956064] #00000000004a041e: a7f40001 brc > 15,4a0420 > [57523.956064] >00000000004a0422: e330a0000012 lt > %r3,0(%r10) > [57523.956064] 00000000004a0428: a7740201 brc > 7,4a082a > [57523.956064] 00000000004a042c: a7f401f3 brc > 15,4a0812 > [57523.956064] 00000000004a0430: d5078030c030 clc > 48(8,%r8),48(%r12) > [57523.956064] 00000000004a0436: a7c40070 brc > 12,4a0516 > [57523.956081] Call Trace: > [57523.956084] ([<00000000004a041e>] check_sync+0xee/0x52c) > [57523.956087] [<00000000004a0a26>] debug_dma_sync_single_for_cpu+0x66/0x74 > [57523.956094] [<000003ff801fcae0>] mlx4_en_complete_rx_desc+0x15c/0x240 > [mlx4_en] > [57523.956098] [<000003ff801fe1fa>] mlx4_en_process_rx_cq+0x56a/0xb58 > [mlx4_en] > [57523.956101] [<000003ff801fe8ea>] mlx4_en_poll_rx_cq+0x92/0xf8 [mlx4_en] > [57523.956105] [<00000000005d558c>] net_rx_action+0xa0/0x2f0 > [57523.956109] [<000000000013cd10>] __do_softirq+0x1e8/0x480 > [57523.956111] [<000000000013cfe4>] run_ksoftirqd+0x3c/0x80 > [57523.956114] [<000000000016f496>] smpboot_thread_fn+0x2c6/0x2e8 > [57523.956118] [<0000000000163834>] kthread+0xd0/0xe4 > [57523.956123] [<00000000006ff19e>] kernel_thread_starter+0x6/0xc > [57523.956125] [<00000000006ff198>] kernel_thread_starter+0x0/0xc > [57523.956127] 1 lock held by ksoftirqd/3/20: > [57523.956129] #0: (&(&dma_entry_hash[i].lock)->rlock){-.-...}, at: > [<000000000049f1d6>] get_hash_bucket+0x4a/0x64 > [57523.956135] Last Breaking-Event-Address: > [57523.956137] [<00000000004a041e>] check_sync+0xee/0x52c > [57523.956139] ---[ end trace ec82af84e1d16c5f ]--- > > --
Hi Gerald, It seems that I missed this mail. I didn't see this warning in our lab in x86 platform. Is it reproduced easily on PPC? Any hints how to reproduce it in our lab? Do you have a 'good' version that didn't have the warning? Thanks, Amir -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/