Hi Jaehoon, We have seen this before. see if the code in memory makes sense. We saw it was overwritten. Philip PS -- Did not find root cause. On Jul 11, 2011, at 9:23 PM, Jaehoon Chung wrote: > Hi > > When I tested MMC card with IOzone, i found this message.. > I tried to find what problem..but i didn't find yet.. > > So i want to get mailing's help..Have ever seen the below message? > (using SDHCI controller, eMMC 4.41 card, 8-bit buswidth) > > I didn't applied about post_req/pre_req in sdhci.c. > (using latest kernel in mmc-tree) > > Also i will try to debug for this problem. > > Plz let me know what is problem.. > > [ 103.605000] Unable to handle kernel NULL pointer dereference at virtual address 00000000 > [ 103.605000] pgd = c0004000 > [ 103.605000] [00000000] *pgd=00000000 > [ 103.605000] Internal error: Oops: 805 [#1] PREEMPT SMP > [ 103.605000] last sysfs file: /sys/devices/virtual/vc/vcsa1/dev > [ 103.605000] Modules linked in: > [ 103.605000] CPU: 0 Not tainted (2.6.39-rc7-00350-g0510951 #78) > [ 103.605000] PC is at wait_for_common+0x8c/0x174 > [ 103.605000] LR is at wait_for_common+0x64/0x174 > [ 103.605000] pc : [<c0290104>] lr : [<c02900dc>] psr: 40000093 > [ 103.605000] sp : ed9efee0 ip : 00000000 fp : ed9eff1c > [ 103.605000] r10: ed9efef0 r9 : ed928000 r8 : 00000002 > [ 103.605000] r7 : ed9f9868 r6 : ed9ee000 r5 : 7fffffff r4 : ed9f9864 > [ 103.605000] r3 : 00000000 r2 : 00000001 r1 : ed9f987c r0 : ed9efef8 > [ 103.605000] Flags: nZcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel > [ 103.605000] Control: 10c5387d Table: 6dbc004a DAC: 00000015 > [ 103.605000] Process mmcqd/0 (pid: 856, stack limit = 0xed9ee2f0) > [ 103.605000] Stack: (0xed9efee0 to 0xed9f0000) > [ 103.605000] fee0: 00000000 00000001 ed928000 c004a5d0 ed9f987c 00000000 edbb4438 ed9f8800 > [ 103.605000] ff00: ed9f9958 ed9f9958 ed9eff44 ed9f9800 00000000 edbb4438 edbb4438 c027b060 > [ 103.605000] ff20: ed9f9800 ed9f9818 ed9f9400 00000000 ed9f9800 c0283614 edb3ee68 00000000 > [ 103.605000] ff40: ed9f9800 ed9f9818 00000000 edbb4438 ed9f9400 ed9f9818 00000000 ed9f9800 > [ 103.605000] ff60: 00000000 edbb4438 00000000 c0283af8 ed9f9818 edbb4438 ed9f9818 ed9ee000 > [ 103.605000] ff80: ed9f9820 edb3eb20 edbb4a20 00000000 edbb4438 c0284558 00000000 ed855d8c > [ 103.605000] ffa0: ed9f9818 ed9effc0 c02844b8 00000000 00000000 c006ae6c 00000000 ed9f9818 > [ 103.605000] ffc0: 00000000 00000000 c002eb20 dead4ead ffffffff ffffffff ed9effd8 ed9effd8 > [ 103.605000] ffe0: 00000000 ed855d8c c006adec c002eb20 00000013 c002eb20 fcfcfcfc fcfcfcfc > [ 103.605000] [<c0290104>] (wait_for_common+0x8c/0x174) from [<c027b060>] (mmc_start_req+0x50/0xec) > [ 103.605000] [<c027b060>] (mmc_start_req+0x50/0xec) from [<c0283614>] (mmc_blk_issue_rw_rq+0x68/0x288) > [ 103.605000] [<c0283614>] (mmc_blk_issue_rw_rq+0x68/0x288) from [<c0283af8>] (mmc_blk_issue_rq+0x2c4/0x2e4) > [ 103.605000] [<c0283af8>] (mmc_blk_issue_rq+0x2c4/0x2e4) from [<c0284558>] (mmc_queue_thread+0xa0/0x110) > [ 103.605000] [<c0284558>] (mmc_queue_thread+0xa0/0x110) from [<c006ae6c>] (kthread+0x80/0x88) > [ 103.605000] [<c006ae6c>] (kthread+0x80/0x88) from [<c002eb20>] (kernel_thread_exit+0x0/0x8) > [ 103.605000] Code: e50b9034 e3822001 e50b2038 e584a01c (e583a000) > [ 103.830000] ---[ end trace 06e246d2b7931d3a ]--- > [ 103.835000] note: mmcqd/0[856] exited with preempt_count 1 > > Regards, > Jaehoon Chung -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
