Wrong mailing list. copying to dm-devel@xxxxxxxxxx NeilBrown On Monday March 24, sam@xxxxxxxxxxx wrote: > On my laptop, doing heavy C++ compilations in parallel with -j3 (this > is a dual core) often generates the following trace: > > INFO: task g++:25119 blocked for more than 120 seconds. > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this > message. > g++ D c03916c0 0 25119 25118 > ecfef200 00200086 c038ef18 c03916c0 c03916c0 f77b2230 f77b2378 c17fa6c0 > 00000000 f89817bc f7486280 000000ff f7a1eb20 00000000 00000000 00000000 > c17fa6c0 00000000 d1401e9c c17f0408 c02a2aa1 d1401e94 c0147100 c02a2c93 > Call Trace: > [<f89817bc>] dm_table_unplug_all+0x1e/0x2e [dm_mod] > [<c02a2aa1>] io_schedule+0x1b/0x24 > [<c0147100>] sync_page+0x33/0x36 > [<c02a2c93>] __wait_on_bit+0x33/0x58 > [<c01470cd>] sync_page+0x0/0x36 > [<c01472fd>] wait_on_page_bit+0x59/0x60 > [<c012cf7b>] wake_bit_function+0x0/0x3c > [<c014e20d>] truncate_inode_pages_range+0x238/0x29f > [<c014e27d>] truncate_inode_pages+0x9/0xc > [<f8c67187>] ext2_delete_inode+0x12/0x6e [ext2] > [<f8c67175>] ext2_delete_inode+0x0/0x6e [ext2] > [<c0170ea5>] generic_delete_inode+0x8f/0xf3 > [<c0170819>] iput+0x60/0x62 > [<c0169aa5>] do_unlinkat+0xb7/0xf9 > [<c0113a3e>] do_page_fault+0x1fa/0x4dc > [<c0104822>] sysenter_past_esp+0x5f/0x85 > ======================= > > This is with 2.6.25-rc6 (SMP) and has been present, as far as I can > remember, since the beginning of the 2.6.25-rc series. It is not > always reproducible, but the trace is always the same. > > My filesystem is stored on a ext3 (rw,noatime) dm_crypt'd partition > leaving in a LVM volume. > > % lsmod | grep dm | grep -v ' 0 *$' > dm_crypt 14340 1 > crypto_blkcipher 18308 6 ecb,cbc,dm_crypt > dm_mod 53008 26 dm_crypt,dm_mirror,dm_snapshot > > Here is the code I have in dm-table.o: > > 00001042 <dm_table_unplug_all>: > 1042: 56 push %esi > 1043: 53 push %ebx > 1044: 8b 98 a0 00 00 00 mov 0xa0(%eax),%ebx > 104a: 8d b0 a0 00 00 00 lea 0xa0(%eax),%esi > 1050: eb 10 jmp 1062 <dm_table_unplug_all+0x20> > 1052: 8b 43 10 mov 0x10(%ebx),%eax > 1055: 8b 40 5c mov 0x5c(%eax),%eax > 1058: 8b 40 34 mov 0x34(%eax),%eax > 105b: e8 fc ff ff ff call 105c <dm_table_unplug_all+0x1a> > 1060: 8b 1b mov (%ebx),%ebx > 1062: 8b 03 mov (%ebx),%eax > 1064: 0f 1f 40 00 nopl 0x0(%eax) > 1068: 39 f3 cmp %esi,%ebx > 106a: 75 e6 jne 1052 <dm_table_unplug_all+0x10> > 106c: 5b pop %ebx > 106d: 5e pop %esi > 106e: c3 ret > > The symbol in 105b call is, after relocation, blk_unplug. > > It there anything else I can do to help debugging this? > > Sam > -- > Samuel Tardieu -- sam@xxxxxxxxxxx -- http://www.rfc1149.net/ > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
