alephan |
07-21-2011 07:49 AM |
blkio crashes at rmdir when using fork
Hello to all.
I have a simple code:
[...]
1. Mount blkio
2. Create 2 subgroups: test1 test2 in blkio cgroup
3. Fork()
child:
puts his pid in test1/task
writes 500 in test1/blkio.weight
does a dd
parent:
puts his pid in test2/task
writes 500 in test1/blkio.weight
does a dd
Everything works ok as expected using blkio.weight file variable.
The problem is that when everything is done, the bash command:
rmdir cgroup/test1 dies like:
Code:
[ 664.087694] Unable to handle kernel paging request at virtual address 4ff60bec
[ 664.102142] pgd = 9a128000
[ 664.107583] [4ff60bec] *pgd=00000000
[ 664.114719] Internal error: Oops: 5 [#1] PREEMPT SMP
[ 664.124615] last sysfs file: /sys/devices/virtual/tty/tty9/uevent
[ 664.136766] Modules linked in: ipv6
[ 664.143737] CPU: 0 Not tainted (2.6.36.2-standard #1)
[ 664.156244] PC is at throtl_unlink_blkio_group+0x10/0x44
[ 664.166852] LR is at blkiocg_destroy+0x90/0x158
[ 664.175886] pc : [<802a9c4c>] lr : [<802a8940>] psr: 20000013
[ 664.175891] sp : 9a00dec8 ip : 9a04a010 fp : 00000001
[ 664.198797] r10: 0000009c r9 : 9a00c000 r8 : 9abdb000
[ 664.209215] r7 : 9a24b520 r6 : 9a24b520 r5 : 806d7ab8 r4 : 9abdb000
[ 664.222234] r3 : 4ff609b8 r2 : 00000000 r1 : 9a24b520 r0 : 9abdb000
[ 664.235254] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 664.249485] Control: 10c53c7d Table: 1a12804a DAC: 00000015
[ 664.260942]
[ 664.260944] PC: 0x802a9bcc:
[ 664.269459] 9bcc eafffffc ebfffff3 e5950234 eb09b89f e5947000 ea000003 e1a01007 e1a00004
[ 664.285861] 9bec ebfffd77 e1a07006 e2570000 0a000004 e4906018 ebfffc14 e3500000 1afffff8
[ 664.302264] 9c0c eafffff4 e5946214 e5950234 eb09b770 e3560000 0a000000 ebf80ffd e1a00005
[ 664.318667] 9c2c ebffffdc e1a00004 e8bd41f0 eaf8b07b e92d4070 e5903208 e1a04000 e1a06001
[ 664.335070] 9c4c e5930234 eb09b87f e3560000 12461018 01a01006 e1a05000 e1a00004 ebfffd58
[ 664.351473] 9c6c e5943208 e1a01005 e5930234 e8bd4070 ea09b767 e92d4070 e59045ec e1a05000
[ 664.367876] 9c8c e1a06001 e5942210 e594320c e0823003 e3530000 d8bd8070 e2840f8a ebf7432e
[ 664.384279] 9cac e3500000 0a000002 e3a00000 e2841f86 eb001303 e1a00005 e2841f86 e1a02006
[ 664.400683]
[ 664.400685] LR: 0x802a88c0:
[ 664.409200] 88c0 e3c3303f e5932004 e2822001 e5832004 e2846014 e1a00006 eb09bd5d e594301c
[ 664.425603] 88e0 e3530000 e1a05000 1a000006 e1a00006 e1a01005 e1a05004 eb09bc48 e5b53020
[ 664.442006] 8900 e5936000 ea000023 e2437004 e5138004 e1a00007 ebfffc9c e1a01005 e1a00006
[ 664.458411] 8920 eb09bc3e e59f00c4 eb09bd70 e59f30c0 e593508c ea000002 e1a0e00f e595f008
[ 664.474816] 8940 e5955000 e5953000 f5d3f000 e59f30a4 e1a00008 e1a01007 e1550003 1afffff5
[ 664.491219] 8960 e59f0088 eb09bc41 eaffffd9 e5932000 e5931004 e59fc080 e5812000 e5821004
[ 664.507622] 8980 e59f2078 e583c000 e5832004 ebf8b526 e1a03006 e5966000 e1530005 e1a00003
[ 664.524025] 89a0 1afffff1 e59f0048 e1a01004 ebf7ddf0 e1a0200d e3c23d7f e3c3303f e5932004
[ 664.540429]
[ 664.540431] SP: 0x9a00de48:
[ 664.548946] de48 9a6ecf70 9a6ec778 9a6ec778 00000000 9a029140 800f04e4 9a00deb8 00000000
[ 664.565349] de68 9a029140 ffffffff 9a00deb4 9a24b520 9a24b520 80034b6c 9abdb000 9a24b520
[ 664.581752] de88 00000000 4ff609b8 9abdb000 806d7ab8 9a24b520 9a24b520 9abdb000 9a00c000
[ 664.598155] dea8 0000009c 00000001 9a04a010 9a00dec8 802a8940 802a9c4c 20000013 ffffffff
[ 664.614558] dec8 9a0e57a0 806d7ab8 9a0e57b4 802a8940 9a155480 806d7138 9a6451c8 00000028
[ 664.630961] dee8 800351c4 800a1514 9a6001a0 9a6451c8 7ecf5e14 800efaf8 00000000 00000000
[ 664.647366] df08 00000b9c 9a6001a0 9a6001a8 800efb64 9a6001d0 9a6001a0 9a6001a8 800f0624
[ 664.663769] df28 9a6001a0 00000000 7ecf5e14 800eb460 9a05a9c0 9a029140 9a485090 1375a948
[ 664.680173]
[ 664.680175] IP: 0x9a049f90:
[ 664.688689] 9f90 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.705092] 9fb0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.721495] 9fd0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.737898] 9ff0 00000000 00000000 00000000 00000000 9a02ba00 00000080 00000009 00000080
[ 664.754303] a010 806d7198 806d7198 00000002 00000010 9a04a020 9a04a020 9a0e74e8 9abfdbc8
[ 664.770706] a030 00000000 9a485090 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.787109] a050 00000000 806d71cc 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.803512] a070 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.819916]
[ 664.819918] R0: 0x9abdaf80:
[ 664.828433] af80 00616473 00000008 00000000 841e0080 00004909 0c060800 40280220 08008901
[ 664.844836] afa0 636f6c62 9abd006b 00000001 00000001 00000010 142d0800 00002400 02d18808
[ 664.861239] afc0 65776f70 9abd0072 00000001 00000001 024a8050 72202600 26808013 90100200
[ 664.877642] afe0 00616473 00000024 00000000 26852026 06440121 48004000 c190402f 00004800
[ 664.894045] b000 9a00b830 00000000 00000000 00000000 fffffa8d 00000000 007dc940 00000000
[ 664.910448] b020 00000000 00000000 9abdb029 00000000 00000000 00000000 007dd140 00000000
[ 664.926853] b040 000003e8 00000000 00000000 00000003 00000000 00000000 00000000 00000000
[ 664.943256] b060 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.959660]
[ 664.959662] R1: 0x9a24b4a0:
[ 664.968177] b4a0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 664.984580] b4c0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.000983] b4e0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.017386] b500 00000000 00000000 00000000 00000000 00000000 00000002 00000000 00000000
[ 665.033791] b520 9abdb000 9a1d7c1c 00000000 742f0000 31747365 00000000 00000000 00000000
[ 665.050194] b540 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.066597] b560 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.083000] b580 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.099404]
[ 665.099406] R4: 0x9abdaf80:
[ 665.107920] af80 00616473 00000008 00000000 841e0080 00004909 0c060800 40280220 08008901
[ 665.124323] afa0 636f6c62 9abd006b 00000001 00000001 00000010 142d0800 00002400 02d18808
[ 665.140728] afc0 65776f70 9abd0072 00000001 00000001 024a8050 72202600 26808013 90100200
[ 665.157131] afe0 00616473 00000024 00000000 26852026 06440121 48004000 c190402f 00004800
[ 665.173534] b000 9a00b830 00000000 00000000 00000000 fffffa8d 00000000 007dc940 00000000
[ 665.189937] b020 00000000 00000000 9abdb029 00000000 00000000 00000000 007dd140 00000000
[ 665.206340] b040 000003e8 00000000 00000000 00000003 00000000 00000000 00000000 00000000
[ 665.222743] b060 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.239147]
[ 665.239149] R5: 0x806d7a38:
[ 665.247663] 7a38 74735f74 00737461 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.264066] 7a58 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.280469] 7a78 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.296872] 7a98 00000000 802a7e58 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.313275] 7ab8 806d7bb8 806d71c4 802a9c3c 00000000 802a9dd8 802a9d74 802a9d24 802a9cd4
[ 665.329678] 7ad8 00000001 806d7b4c 806d6e0c 00000000 00000000 802aa3f8 00000000 00000000
[ 665.346081] 7af8 802aa4c8 802aa414 00000000 00000000 802aa434 00000000 802aa450 802aa468
[ 665.362484] 7b18 00000000 00000000 00000000 802aa4a0 802aa480 00000000 00000000 706f6f6e
[ 665.378890]
[ 665.378892] R6: 0x9a24b4a0:
[ 665.387406] b4a0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.403809] b4c0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.420212] b4e0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.436615] b500 00000000 00000000 00000000 00000000 00000000 00000002 00000000 00000000
[ 665.453018] b520 9abdb000 9a1d7c1c 00000000 742f0000 31747365 00000000 00000000 00000000
[ 665.469421] b540 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.485824] b560 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.502227] b580 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.518631]
[ 665.518633] R7: 0x9a24b4a0:
[ 665.527148] b4a0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.543551] b4c0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.559954] b4e0 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.576357] b500 00000000 00000000 00000000 00000000 00000000 00000002 00000000 00000000
[ 665.592760] b520 9abdb000 9a1d7c1c 00000000 742f0000 31747365 00000000 00000000 00000000
[ 665.609163] b540 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.625566] b560 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.641969] b580 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.658373]
[ 665.658375] R8: 0x9abdaf80:
[ 665.666889] af80 00616473 00000008 00000000 841e0080 00004909 0c060800 40280220 08008901
[ 665.683294] afa0 636f6c62 9abd006b 00000001 00000001 00000010 142d0800 00002400 02d18808
[ 665.699697] afc0 65776f70 9abd0072 00000001 00000001 024a8050 72202600 26808013 90100200
[ 665.716100] afe0 00616473 00000024 00000000 26852026 06440121 48004000 c190402f 00004800
[ 665.732503] b000 9a00b830 00000000 00000000 00000000 fffffa8d 00000000 007dc940 00000000
[ 665.748906] b020 00000000 00000000 9abdb029 00000000 00000000 00000000 007dd140 00000000
[ 665.765309] b040 000003e8 00000000 00000000 00000003 00000000 00000000 00000000 00000000
[ 665.781712] b060 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.798116]
[ 665.798118] R9: 0x9a00bf80:
[ 665.806633] bf80 ff9e63df c7e7feb7 fbae7bbf ffffeeff f7aafff7 7eff9dff 9bf7feff fbacc13f
[ 665.823035] bfa0 7bffab2f ddfffffe 0159f972 dfae3ffd fff37fdb ddabef7f af7e3b5f 5bb0fefb
[ 665.839440] bfc0 fddb0df7 5fffffef b3ff7d3f bfa7ffff fdf5fffc f94b8f3b fffdbef3 dfb3fb5d
[ 665.855845] bfe0 fe7e7f5f 799dee66 e5dfdcf6 3fb77fff f6ff6efd 1d9ff3bf e7ff64fa f7eadd7f
[ 665.872248] c000 00000002 00000004 00000000 9a013640 806cdb48 00000000 00000017 9a013640
[ 665.888651] c020 80ab4f20 806bf180 00000000 9a0138bc 00000002 9a060200 9a00dd8c 9a00dd20
[ 665.905054] c040 80515b14 00000000 00000000 00000000 00000000 00000000 01000000 00000000
[ 665.921457] c060 2ab5a6d0 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 665.937863] Process rmdir (pid: 272, stack limit = 0x9a00c2f0)
[ 665.949494] Stack: (0x9a00dec8 to 0x9a00e000)
[ 665.958180] dec0: 9a0e57a0 806d7ab8 9a0e57b4 802a8940 9a155480 806d7138
[ 665.974495] dee0: 9a6451c8 00000028 800351c4 800a1514 9a6001a0 9a6451c8 7ecf5e14 800efaf8
[ 665.990810] df00: 00000000 00000000 00000b9c 9a6001a0 9a6001a8 800efb64 9a6001d0 9a6001a0
[ 666.007125] df20: 9a6001a8 800f0624 9a6001a0 00000000 7ecf5e14 800eb460 9a05a9c0 9a029140
[ 666.023439] df40: 9a485090 1375a948 00000005 9a263007 00000000 00000014 00000000 00000000
[ 666.039756] df60: 00000000 9a060d94 00035000 802b6a2c 00035000 00035000 9a060d94 00014000
[ 666.056071] df80: 00035000 9a00c000 00021000 800c9d70 00014000 9a263000 00021000 7ecf5f03
[ 666.072386] dfa0: 000133b0 80035040 7ecf5f03 000133b0 7ecf5f03 0000ad44 ffff7994 00000001
[ 666.088701] dfc0: 7ecf5f03 000133b0 7ecf5e14 00000028 00013489 00000000 0000009c 00000001
[ 666.105015] dfe0: 00000002 7ecf5c78 00008eb0 2acbe5ac 60000010 7ecf5f03 00000000 00000000
[ 666.121339] [<802a9c4c>] (throtl_unlink_blkio_group+0x10/0x44) from [<802a8940>] (blkiocg_destroy+)
[ 666.141141] [<802a8940>] (blkiocg_destroy+0x90/0x158) from [<800a1514>] (cgroup_diput+0x4c/0xcc)
[ 666.158677] [<800a1514>] (cgroup_diput+0x4c/0xcc) from [<800efaf8>] (dentry_iput+0x9c/0xcc)
[ 666.175342] [<800efaf8>] (dentry_iput+0x9c/0xcc) from [<800efb64>] (d_kill+0x3c/0x64)
[ 666.190966] [<800efb64>] (d_kill+0x3c/0x64) from [<800f0624>] (dput+0x15c/0x178)
[ 666.205732] [<800f0624>] (dput+0x15c/0x178) from [<800eb460>] (do_rmdir+0xb0/0xe8)
[ 666.220847] [<800eb460>] (do_rmdir+0xb0/0xe8) from [<80035040>] (ret_fast_syscall+0x0/0x30)
[ 666.237512] Code: e92d4070 e5903208 e1a04000 e1a06001 (e5930234)
[ 666.250238] ---[ end trace 5c44fcc60b1d0750 ]---
[ 666.259463] note: rmdir[272] exited with preempt_count 2
[ 666.270100] BUG: scheduling while atomic: rmdir/272/0x40000003
[ 666.281752] Modules linked in: ipv6
[ 666.288758] [<8003a6e8>] (unwind_backtrace+0x0/0xec) from [<805153a4>] (schedule+0x90/0x8f0)
[ 666.305614] [<805153a4>] (schedule+0x90/0x8f0) from [<80065974>] (__cond_resched+0x24/0x34)
[ 666.322293] [<80065974>] (__cond_resched+0x24/0x34) from [<80515d18>] (_cond_resched+0x30/0x40)
[ 666.339675] [<80515d18>] (_cond_resched+0x30/0x40) from [<800c5c08>] (unmap_vmas+0x528/0x5ec)
[ 666.356830] [<800c5c08>] (unmap_vmas+0x528/0x5ec) from [<800c8584>] (exit_mmap+0xc4/0x178)
[ 666.373340] [<800c8584>] (exit_mmap+0xc4/0x178) from [<8006d930>] (mmput+0x3c/0xf8)
[ 666.388694] [<8006d930>] (mmput+0x3c/0xf8) from [<80071a6c>] (exit_mm+0x12c/0x130)
[ 666.403816] [<80071a6c>] (exit_mm+0x12c/0x130) from [<800730c0>] (do_exit+0x1d8/0x604)
[ 666.419629] [<800730c0>] (do_exit+0x1d8/0x604) from [<80038d5c>] (die+0x294/0x2d4)
[ 666.434746] [<80038d5c>] (die+0x294/0x2d4) from [<8003b66c>] (__do_kernel_fault+0x64/0x84)
[ 666.451252] [<8003b66c>] (__do_kernel_fault+0x64/0x84) from [<8003b868>] (do_page_fault+0x1dc/0x1f)
[ 666.469490] [<8003b868>] (do_page_fault+0x1dc/0x1f0) from [<80034494>] (do_DataAbort+0x34/0x94)
[ 666.486971] [<80034494>] (do_DataAbort+0x34/0x94) from [<80034b6c>] (__dabt_svc+0x4c/0x60)
[ 666.503467] Exception stack(0x9a00de80 to 0x9a00dec8)
[ 666.513598] de80: 9abdb000 9a24b520 00000000 4ff609b8 9abdb000 806d7ab8 9a24b520 9a24b520
[ 666.529928] dea0: 9abdb000 9a00c000 0000009c 00000001 9a04a010 9a00dec8 802a8940 802a9c4c
[ 666.546252] dec0: 20000013 ffffffff
[ 666.553210] [<80034b6c>] (__dabt_svc+0x4c/0x60) from [<802a9c4c>] (throtl_unlink_blkio_group+0x10/)
[ 666.571974] [<802a9c4c>] (throtl_unlink_blkio_group+0x10/0x44) from [<802a8940>] (blkiocg_destroy+)
[ 666.591780] [<802a8940>] (blkiocg_destroy+0x90/0x158) from [<800a1514>] (cgroup_diput+0x4c/0xcc)
[ 666.609430] [<800a1514>] (cgroup_diput+0x4c/0xcc) from [<800efaf8>] (dentry_iput+0x9c/0xcc)
[ 666.626173] [<800efaf8>] (dentry_iput+0x9c/0xcc) from [<800efb64>] (d_kill+0x3c/0x64)
[ 666.641849] [<800efb64>] (d_kill+0x3c/0x64) from [<800f0624>] (dput+0x15c/0x178)
[ 666.656622] [<800f0624>] (dput+0x15c/0x178) from [<800eb460>] (do_rmdir+0xb0/0xe8)
[ 666.671821] [<800eb460>] (do_rmdir+0xb0/0xe8) from [<80035040>] (ret_fast_syscall+0x0/0x30)
Segmentation fault
KERNEL: 2.6.36
|