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@xxxxxxxxx/
looks like there'll be patch out soon
jirka
