Sachin Sant wrote:
Tejun Heo wrote:
Ah... sorry about that. Sachin, is it possible for you to build the
kernel with debug info and ask gdb where the stalling NIP is in the c
file?
<6>NET: Registered protocol family 10
<3>BUG: soft lockup - CPU#2 stuck for 61s! [modprobe:1865]
<4>Modules linked in: ipv6(+) fuse loop dm_mod sg sd_mod crc_t10dif
ibmvscsic scsi_transport_srp scsi_tgt scsi_mod
<4>NIP: c00000000004198c LR: c00000000015dac8 CTR: 0000000000000040
<4>REGS: c0000000fbdbb6f0 TRAP: 0901 Not tainted (2.6.31-git5)
<4>MSR: 8000000000009032 <EE,ME,IR,DR> CR: 44224420 XER: 20000001
<4>TASK = c0000000fbd57840[1865] 'modprobe' THREAD: c0000000fbdb8000
CPU: 2
<4>GPR00: 0000000000000040 c0000000fbdbb970 c000000000a96d08
d00007fffff00000
<4>GPR04: 0000000000000000 0000000000000000 d00007fffff00000
d00007fffff00000
<4>GPR08: 0000000000000000 c000000001020180 c000000000b6b4e8
00000000000003c0
<4>GPR12: 0000000048224428 c000000000b82a00
<4>NIP [c00000000004198c] .memset+0x60/0xfc
<4>LR [c00000000015dac8] .pcpu_alloc+0x758/0x960
<4>Call Trace:
<4>[c0000000fbdbb970] [c00000000015da58] .pcpu_alloc+0x6e8/0x960
(unreliable)
<4>[c0000000fbdbba90] [c000000000565664] .snmp_mib_init+0x34/0x9c
<4>[c0000000fbdbbb20] [d00000000212e130] .ipv6_add_dev+0x1cc/0x3dc [ipv6]
<4>[c0000000fbdbbbc0] [d0000000021598ac] .addrconf_init+0x6c/0x194 [ipv6]
<4>[c0000000fbdbbc50] [d00000000215967c] .inet6_init+0x1bc/0x34c [ipv6]
<4>[c0000000fbdbbce0] [c0000000000097a4] .do_one_initcall+0x88/0x1bc
<4>[c0000000fbdbbd90] [c0000000000c84dc] .SyS_init_module+0x11c/0x29c
<4>[c0000000fbdbbe30] [c0000000000085b4] syscall_exit+0x0/0x40
<4>Instruction dump:
<4>98860000 38c60001 409e000c b0860000 38c60002 409d000c 90860000
38c60004
<4>78a0d183 78a506a0 7c0903a6 4182002c <f8860000> f8860008 f8860010
f8860018
Latest git (2.6.31-git9:78f28b7c555359c67c2a0d23f7436e915329421e)
still has this bug.
Thanks
-Sachin
2:mon> r
R00 = 0000000000000040 R07 = d00007fffff00000
R01 = c0000000fbdbb970 R08 = 0000000000000000
R02 = c000000000a96d08 R09 = c000000001020180
R03 = d00007fffff00000 R10 = c000000000b6b4e8
R04 = 0000000000000000 R11 = 00000000000003c0
R05 = 0000000000000000 R12 = 0000000048224428
R06 = d00007fffff00000 R13 = c000000000b82a00
pc = c00000000004198c .memset+0x60/0xfc
lr = c00000000015dac8 .pcpu_alloc+0x758/0x960
msr = 8000000000009032 cr = 44224420
ctr = 0000000000000040 xer = 0000000020000001 trap = 501
2:mon>
The corresponding c code is :
pcpu_populate_chunk():
/home/sachin/work/linux-2.6.31/mm/percpu.c:978
/* commit new bitmap */
bitmap_copy(chunk->populated, populated, pcpu_unit_pages);
clear:
for_each_possible_cpu(cpu)
memset((void *)pcpu_chunk_addr(chunk, cpu, 0) + off, 0,
size);
1aa0: e9 3f 00 38 ld r9,56(r31)
1aa4: 7b a0 1f 24 rldicr r0,r29,3,60
1aa8: e8 7b 00 18 ld r3,24(r27)
1aac: 38 80 00 00 li r4,0
1ab0: e8 a1 00 88 ld r5,136(r1)
1ab4: 7c 09 00 2a ldx r0,r9,r0
1ab8: 7c 63 02 14 add r3,r3,r0
1abc: 7c 63 b2 14 add r3,r3,r22
1ac0: 48 00 00 01 bl 1ac0 <.pcpu_alloc+0x754>
1ac4: 60 00 00 00 nop
Thanks
-Sachin
--
---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------
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