linux-kernel - Re: [syzbot] WARNING in put_pmu

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Date:   Mon, 19 Dec 2022 22:29:35 -0800
From:   syzbot <syzbot+697196bc0265049822bd@...kaller.appspotmail.com>
To:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        bpf@...r.kernel.org, jolsa@...nel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        mark.rutland@....com, mingo@...hat.com, namhyung@...nel.org,
        netdev@...r.kernel.org, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] WARNING in put_pmu_ctx

syzbot has found a reproducer for the following issue on:

HEAD commit:    e2bb9e01d589 bpf: Remove trace_printk_lock
git tree:       bpf-next
console output: https://syzkaller.appspot.com/x/log.txt?x=124cf480480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b0e91ad4b5f69c47
dashboard link: https://syzkaller.appspot.com/bug?extid=697196bc0265049822bd
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=163fde6f880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17319890480000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cee993a7fed1/disk-e2bb9e01.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/109057856bce/vmlinux-e2bb9e01.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7da529d16ff7/bzImage-e2bb9e01.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+697196bc0265049822bd@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5367 at kernel/events/core.c:4920 put_pmu_ctx kernel/events/core.c:4920 [inline]
WARNING: CPU: 0 PID: 5367 at kernel/events/core.c:4920 put_pmu_ctx+0x2a5/0x390 kernel/events/core.c:4893
Modules linked in:
CPU: 0 PID: 5367 Comm: syz-executor374 Not tainted 6.1.0-syzkaller-09637-ge2bb9e01d589 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:put_pmu_ctx kernel/events/core.c:4920 [inline]
RIP: 0010:put_pmu_ctx+0x2a5/0x390 kernel/events/core.c:4893
Code: dd ff e8 2e 0d dd ff 48 8d 7b 50 48 c7 c6 a0 fa a2 81 e8 3e c6 c7 ff eb d6 e8 17 0d dd ff 0f 0b e9 64 ff ff ff e8 0b 0d dd ff <0f> 0b eb 88 e8 c2 bc 2a 00 eb a5 e8 fb 0c dd ff 0f 0b e9 e4 fd ff
RSP: 0018:ffffc90003e2fc68 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880b9842328 RCX: 0000000000000000
RDX: ffff88802ad5ba80 RSI: ffffffff81a3a605 RDI: 0000000000000001
RBP: ffff8880b9842358 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed1017306cf8 R11: 0000000000000000 R12: ffff8880b9836890
R13: ffff8880b98367c0 R14: 0000000000000293 R15: ffff8880b9842330
FS:  0000555557481300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f31c999e758 CR3: 0000000020f5e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 _free_event+0x3c5/0x13d0 kernel/events/core.c:5196
 put_event kernel/events/core.c:5283 [inline]
 perf_event_release_kernel+0x6ad/0x8f0 kernel/events/core.c:5395
 perf_release+0x37/0x50 kernel/events/core.c:5405
 __fput+0x27c/0xa90 fs/file_table.c:320
 task_work_run+0x16f/0x270 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f31c9963019
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff1d0f25c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 00000000000f4240 RCX: 00007f31c9963019
RDX: 00007f31c9963019 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000140 R09: 0000000000000140
R10: 0000000000000008 R11: 0000000000000246 R12: 00007fff1d0f25e0
R13: 00007fff1d0f2600 R14: 0000000000025861 R15: 00007fff1d0f25dc
 </TASK>