[Bug runtime/4075] New: BUG: sleeping function called from invalid context, when running systemtap tests

[Bug runtime/4075] New: BUG: sleeping function called from invalid context, when running systemtap tests

[srinivasa at in dot ibm dot com]

My environment is kernel-2.6.20-rc6,elfutils-0.124,systemtap--20070217.

When I executed the tests on ppc64 system,I got the below error in dmesg. But
system didn't crashed and tests are still running.

But these messages are getting generated frequently,making the  system less
responsive.

=========================================================================


BUG: sleeping function called from invalid context at
/home/systemtap/tmp/stap_testing_200702191409/install/share/systemtap/runtime/string.c:78
in_atomic():0, irqs_disabled():1
Call Trace:
[C0000000010EF680] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C0000000010EF720] [C0000000000614F0] .__might_sleep+0xec/0x108
[C0000000010EF7A0] [D0000000008917A0] ._stp_text_str+0x330/0x340
[stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919]
[C0000000010EF850] [D000000000893AB0] .probe_1674+0x19c/0x1c0
[stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919]
[C0000000010EF8E0] [D000000000893088] .enter_begin_probe+0x134/0x24c
[stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919]
[C0000000010EF970] [D000000000895DC0] .systemtap_module_init+0x160/0x250
[stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919]
[C0000000010EFA20] [D000000000895EC0] .probe_start+0x10/0x2c
[stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919]
[C0000000010EFAA0] [D000000000895F4C] ._stp_handle_start+0x70/0x10c
[stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919]
[C0000000010EFBB0] [D0000000008961E8] ._stp_proc_write_cmd+0x200/0x984
[stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919]
[C0000000010EFCF0] [C0000000000E5778] .vfs_write+0x120/0x208
[C0000000010EFD90] [C0000000000E61F8] .sys_write+0x4c/0x8c
[C0000000010EFE30] [C0000000000086B4] syscall_exit+0x0/0x40
stap_f9e8bc0d73a7a5a7d310b3fb828e2e4b_3919: systemtap: 0.5.13, base:
d000000000890000, memory: 48756+32832+22208+2103296+666489
data+text+ctx+io+glob, probes: 12
stap_be9ef545e9a11360e6bfd9c4aaebdb2e_3839: systemtap: 0.5.13, base:
d000000000890000, memory: 48892+32824+22208+2103296+666489
data+text+ctx+io+glob, probes: 12
stap_f27f7719b34a104b4fa789db5d6f0abb_127631: systemtap: 0.5.13, base:
d000000000930000, memory: 325044+34768+22208+2103296+666455
data+text+ctx+io+glob, probes: 951
stap_09cfd6b65e8d6bce0560504dedf60e17_875: systemtap: 0.5.13, base:
d000000000890000, memory: 47212+29856+83648+2103296+666178
data+text+ctx+io+glob, probes: 1
stap_1009213fa0e29127b4e711b5f84f88ad_877: systemtap: 0.5.13, base:
d000000000890000, memory: 44940+29032+17088+2103296+666177
data+text+ctx+io+glob, probes: 1
stap_d7092c2a7bdc5f0b07d1a4d263215e01_1327: systemtap: 0.5.13, base:
d000000000890000, memory: 51324+32816+115008+2103296+666177
data+text+ctx+io+glob, probes: 1
stap_5e614b993b60fcbc273c6b4c80153f79_1336: systemtap: 0.5.13, base:
d000000000890000, memory: 54708+34480+42688+2103296+666177
data+text+ctx+io+glob, probes: 1
stap_bededda0bf09215ade9700a615bb7e15_2879: systemtap: 0.5.13, base:
d0000000008a0000, memory: 69468+44528+53568+2103296+666215
data+text+ctx+io+glob, probes: 1
stap_0102a0dbdef607096dd166d6332e9dcf_1588: systemtap: 0.5.13, base:
d000000000890000, memory: 52044+33680+92608+2103296+666179
data+text+ctx+io+glob, probes: 1
[root@llm27lp1 ~]# BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C000000046FB3540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C000000046FB35E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C000000046FB3660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000046FB3770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000046FB3800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C000000046FB3890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C000000046FB3940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C000000046FB39D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C000000046FB3AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C000000046FB3D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C000000046FB3E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C000000039403540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C0000000394035E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C000000039403660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000039403770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000039403800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C000000039403890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C000000039403940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C0000000394039D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C000000039403AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C000000039403D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C000000039403E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000002B683540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000002B6835E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000002B683660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000002B683770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000002B683800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000002B683890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000002B683940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000002B6839D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000002B683AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000002B683D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000002B683E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000000FC73540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000000FC735E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000000FC73660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000FC73770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000FC73800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000000FC73890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000000FC73940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000000FC739D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000000FC73AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000000FC73D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000000FC73E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000002DE6B540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000002DE6B5E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000002DE6B660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000002DE6B770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000002DE6B800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000002DE6B890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000002DE6B940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000002DE6B9D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000002DE6BAA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000002DE6BD90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000002DE6BE30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000003E953540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000003E9535E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000003E953660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000003E953770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000003E953800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000003E953890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000003E953940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000003E9539D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000003E953AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000003E953D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000003E953E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C000000036A43540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C000000036A435E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C000000036A43660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000036A43770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000036A43800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C000000036A43890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C000000036A43940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C000000036A439D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C000000036A43AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C000000036A43D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C000000036A43E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C000000007637540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C0000000076375E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C000000007637660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000007637770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C000000007637800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C000000007637890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C000000007637940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C0000000076379D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C000000007637AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C000000007637D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C000000007637E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000003A2BB540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000003A2BB5E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000003A2BB660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000003A2BB770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000003A2BB800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000003A2BB890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000003A2BB940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000003A2BB9D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000003A2BBAA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000003A2BBD90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000003A2BBE30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000000A3FF540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000000A3FF5E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000000A3FF660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000A3FF770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000A3FF800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000000A3FF890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000000A3FF940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000000A3FF9D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000000A3FFAA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000000A3FFD90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000000A3FFE30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000000FC43540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000000FC435E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000000FC43660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000FC43770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000FC43800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000000FC43890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000000FC43940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000000FC439D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000000FC43AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000000FC43D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000000FC43E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C0000000010EF540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C0000000010EF5E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C0000000010EF660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C0000000010EF770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C0000000010EF800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C0000000010EF890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C0000000010EF940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C0000000010EF9D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C0000000010EFAA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C0000000010EFD90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C0000000010EFE30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000000FC87540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000000FC875E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000000FC87660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000FC87770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000000FC87800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000000FC87890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000000FC87940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000000FC879D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000000FC87AA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000000FC87D90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000000FC87E30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000003DF9B540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000003DF9B5E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000003DF9B660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000003DF9B770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000003DF9B800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000003DF9B890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000003DF9B940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000003DF9B9D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000003DF9BAA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000003DF9BD90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000003DF9BE30] [C0000000000086B4] syscall_exit+0x0/0x40
BUG: sleeping function called from invalid context at
/tmp/stapTeqtXw/stap_786f531764228440af952c37c19aeeaa_267654.c:17306
in_atomic():0, irqs_disabled():1
Call Trace:
[C00000004366B540] [C00000000000FEBC] .show_stack+0x68/0x1b0 (unreliable)
[C00000004366B5E0] [C0000000000614F0] .__might_sleep+0xec/0x108
[C00000004366B660] [D000000000B5BCA8] .probe_1818+0x65c/0xc68
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000004366B770] [D000000000B03E58] .enter_kprobe_probe+0x188/0x260
[stap_786f531764228440af952c37c19aeeaa_267654]
[C00000004366B800] [C000000000364D88] .aggr_pre_handler+0x64/0xe0
[C00000004366B890] [C000000000362BB4] .kprobe_exceptions_notify+0x29c/0x520
[C00000004366B940] [C000000000363CD0] .notifier_call_chain+0x4c/0x90
[C00000004366B9D0] [C00000000036228C] .program_check_exception+0x12c/0x5e8
[C00000004366BAA0] [C000000000004A7C] program_check_common+0xfc/0x100
--- Exception: 700 at .do_execve+0x0/0x31c
    LR = .kretprobe_trampoline_holder+0x0/0x8
[C00000004366BD90] [C000000000010BAC] .sys_execve+0x58/0xe4 (unreliable)
[C00000004366BE30] [C0000000000086B4] syscall_exit+0x0/0x40
===================================================

-- 
           Summary: BUG: sleeping function called from invalid context, when
                    running systemtap tests
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: srinivasa at in dot ibm dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4075

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[Bug runtime/4075] BUG: sleeping function called from invalid context, when running systemtap tests

[hunt at redhat dot com]

------- Additional Comments From hunt at redhat dot com  2007-02-19 16:42 -------
Looks like __get_user() and maybe some other copy functions are now calling
might_sleep(). Their messages can be safely ignored in our case, but they do
slow things down.  The solution is either to use functions that do not call
might_sleep in ppc64 or implement our own equivalent copy functions in
runtime/copy.c

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[Bug runtime/4075] BUG: sleeping function called from invalid context, when running systemtap tests

[fche at redhat dot com]

------- Additional Comments From fche at redhat dot com  2007-02-19 17:09 -------
Or one could stop trying to get around the appropriate might_sleep warning, and
instead use (and port if needed) the exception-fixup-protected mechanisms such
as stp_strncpy_from_user or kread*.

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[Bug runtime/4075] BUG: sleeping function called from invalid context, when running systemtap tests

[hunt at redhat dot com]

------- Additional Comments From hunt at redhat dot com  2007-02-19 18:24 -------
(In reply to comment #2)
> Or one could stop trying to get around the appropriate might_sleep warning, and
> instead use (and port if needed) the exception-fixup-protected mechanisms such
> as stp_strncpy_from_user or kread*.

 All the userspace copy mechanisms we use are exception-fixup-protected. 
And kread is only for kernel copies.

Are you suggesting we create our own set of userspace copy functions instead of
relying on the shifting ones in the kernel?  



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[Bug runtime/4075] BUG: sleeping function called from invalid context, when running systemtap tests

[ananth at in dot ibm dot com]

------- Additional Comments From ananth at in dot ibm dot com  2007-02-20 05:33 -------
Just checked the kernel code as far back as linux-2.6.17... all versions have
the might_sleep() check in __get_user_nocheck() on powerpc for the case where
the address in question is in userspace. AFAICS, the check is legitimate since
the user address may not be in memory at the time of access.

We may not have hit this BUG on other architectures, but I don't see why not.
Looking at x86_64, __get_user() -> __get_user_nocheck() -> __get_user_size()
which ends up calling __chk_user_ptr() which is defined in
include/linux/compiler.h. The call is stubbed out if __CHECKER__ isn't defined
(the default case), but I don't know what that call translates to if __CHECKER__
is defined. Maybe that is a worthy exercise on x86_64?

Martin,
If you think that these warnings can safely be ignored, I guess the only way out
is to have separate runtime/copy.c variants as you suggested earlier.

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[Bug runtime/4075] BUG: sleeping function called from invalid context, when running systemtap tests

[jkenisto at us dot ibm dot com]

------- Additional Comments From jkenisto at us dot ibm dot com  2007-03-01 22:55 -------
Martin says this is a powerpc-only bug.  Powerpc runtime needs fixing. 
Assigning to Ananth.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|systemtap at sources dot    |ananth at in dot ibm dot com
                   |redhat dot com              |
             Status|NEW                         |ASSIGNED


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