netdev - [bug] splat in perf event

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date: Tue, 19 Dec 2023 17:34:13 -0800
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: bpf <bpf@...r.kernel.org>, Jiri Olsa <jolsa@...nel.org>, 
	Network Development <netdev@...r.kernel.org>, Daniel Borkmann <daniel@...earbox.net>, 
	Andrii Nakryiko <andrii@...nel.org>, Jakub Kicinski <kuba@...nel.org>, 
	Steven Rostedt <rostedt@...dmis.org>, Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: [bug] splat in perf event

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?