* [bug] splat in perf event
@ 2023-12-20 1:34 Alexei Starovoitov
2023-12-20 8:34 ` Jiri Olsa
0 siblings, 1 reply; 2+ messages in thread
From: Alexei Starovoitov @ 2023-12-20 1:34 UTC (permalink / raw)
To: bpf, Jiri Olsa, Network Development, Daniel Borkmann,
Andrii Nakryiko, Jakub Kicinski, Steven Rostedt,
Arnaldo Carvalho de Melo
Hi,
after rebasing bpf-next to the latest net-next.
I consistently see the following while running
test_progs -t attach_probe/manual-default
[ 28.638654] WARNING: CPU: 1 PID: 2135 at kernel/events/core.c:1950
__do_sys_perf_event_open+0x14e0/0x15b0
[ 28.639329] Modules linked in: bpf_testmod(O)
[ 28.639632] CPU: 1 PID: 2135 Comm: test_progs Tainted: G
O 6.7.0-rc5-01520-gc337f237291b #5281
[ 28.640299] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
[ 28.641062] RIP: 0010:__do_sys_perf_event_open+0x14e0/0x15b0
[ 28.647751] Call Trace:
[ 28.647919] <TASK>
[ 28.648082] ? __warn+0xa1/0x1f0
[ 28.648311] ? __do_sys_perf_event_open+0x14e0/0x15b0
[ 28.648641] ? report_bug+0x1fa/0x230
[ 28.648902] ? handle_bug+0x3c/0x70
[ 28.649164] ? exc_invalid_op+0x17/0x40
[ 28.649416] ? asm_exc_invalid_op+0x1a/0x20
[ 28.649699] ? entry_SYSCALL_64_after_hwframe+0x46/0x4e
[ 28.650062] ? __do_sys_perf_event_open+0x14e0/0x15b0
[ 28.650406] ? perf_event_set_output+0x2a0/0x2a0
[ 28.650727] ? __audit_syscall_entry+0x4f/0x200
[ 28.651063] do_syscall_64+0x2f/0xa0
[ 28.651306] entry_SYSCALL_64_after_hwframe+0x46/0x4e
[ 28.651635] RIP: 0033:0x7fc0846f752d
[ 28.656060] </TASK>
[ 28.656219] irq event stamp: 413681
[ 28.656461] hardirqs last enabled at (413689):
[<ffffffff81193e67>] console_unlock+0x137/0x140
[ 28.657083] hardirqs last disabled at (413698):
[<ffffffff81193e4c>] console_unlock+0x11c/0x140
[ 28.657663] softirqs last enabled at (413368):
[<ffffffff810c0e89>] irq_exit_rcu+0x99/0xf0
[ 28.658215] softirqs last disabled at (413351):
[<ffffffff810c0e89>] irq_exit_rcu+0x99/0xf0
Line 1950 is
for_each_sibling_event(sibling, group_leader) {
if (__perf_event_read_size(sibling->attr.read_format,
group_leader->nr_siblings +
1) > 16*1024)
return false;
}
Probably a known issue?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [bug] splat in perf event
2023-12-20 1:34 [bug] splat in perf event Alexei Starovoitov
@ 2023-12-20 8:34 ` Jiri Olsa
0 siblings, 0 replies; 2+ messages in thread
From: Jiri Olsa @ 2023-12-20 8:34 UTC (permalink / raw)
To: Alexei Starovoitov
Cc: bpf, Network Development, Daniel Borkmann, Andrii Nakryiko,
Jakub Kicinski, Steven Rostedt, Arnaldo Carvalho de Melo,
Mark Rutland
On Tue, Dec 19, 2023 at 05:34:13PM -0800, Alexei Starovoitov wrote:
> Hi,
>
> after rebasing bpf-next to the latest net-next.
> I consistently see the following while running
> test_progs -t attach_probe/manual-default
>
> [ 28.638654] WARNING: CPU: 1 PID: 2135 at kernel/events/core.c:1950
> __do_sys_perf_event_open+0x14e0/0x15b0
> [ 28.639329] Modules linked in: bpf_testmod(O)
> [ 28.639632] CPU: 1 PID: 2135 Comm: test_progs Tainted: G
> O 6.7.0-rc5-01520-gc337f237291b #5281
> [ 28.640299] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
> [ 28.641062] RIP: 0010:__do_sys_perf_event_open+0x14e0/0x15b0
> [ 28.647751] Call Trace:
> [ 28.647919] <TASK>
> [ 28.648082] ? __warn+0xa1/0x1f0
> [ 28.648311] ? __do_sys_perf_event_open+0x14e0/0x15b0
> [ 28.648641] ? report_bug+0x1fa/0x230
> [ 28.648902] ? handle_bug+0x3c/0x70
> [ 28.649164] ? exc_invalid_op+0x17/0x40
> [ 28.649416] ? asm_exc_invalid_op+0x1a/0x20
> [ 28.649699] ? entry_SYSCALL_64_after_hwframe+0x46/0x4e
> [ 28.650062] ? __do_sys_perf_event_open+0x14e0/0x15b0
> [ 28.650406] ? perf_event_set_output+0x2a0/0x2a0
> [ 28.650727] ? __audit_syscall_entry+0x4f/0x200
> [ 28.651063] do_syscall_64+0x2f/0xa0
> [ 28.651306] entry_SYSCALL_64_after_hwframe+0x46/0x4e
> [ 28.651635] RIP: 0033:0x7fc0846f752d
> [ 28.656060] </TASK>
> [ 28.656219] irq event stamp: 413681
> [ 28.656461] hardirqs last enabled at (413689):
> [<ffffffff81193e67>] console_unlock+0x137/0x140
> [ 28.657083] hardirqs last disabled at (413698):
> [<ffffffff81193e4c>] console_unlock+0x11c/0x140
> [ 28.657663] softirqs last enabled at (413368):
> [<ffffffff810c0e89>] irq_exit_rcu+0x99/0xf0
> [ 28.658215] softirqs last disabled at (413351):
> [<ffffffff810c0e89>] irq_exit_rcu+0x99/0xf0
>
> Line 1950 is
> for_each_sibling_event(sibling, group_leader) {
> if (__perf_event_read_size(sibling->attr.read_format,
> group_leader->nr_siblings +
> 1) > 16*1024)
> return false;
> }
>
>
> Probably a known issue?
yes, https://lore.kernel.org/linux-perf-users/20231214000620.3081018-1-lucas.demarchi@intel.com/
looks like there'll be patch out soon
jirka
^ permalink raw reply [flat|nested] 2+ messages in thread
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