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Mon, 07 Sep 2026 10:57:25 -0700 (PDT) Date: Mon, 07 Sep 2026 10:57:25 -0700 In-Reply-To: <6a9dc9e7.87c06881.102b7.0007.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9efb05.f81106d8.4d30e.0002.GAE@google.com> Subject: Re: [syzbot] [trace?] WARNING in ring_buffer_map_get_reader (3) From: syzbot To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: df2908090cda Linux 7.3-rc2 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1216caf9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f dashboard link: https://syzkaller.appspot.com/bug?extid=de3d7f9bcc9212f3fae1 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1616caf9580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+de3d7f9bcc9212f3fae1@syzkaller.appspotmail.com Ring buffer [0] commit overrun lost 3 events at timestamp:71798603963 ------------[ cut here ]------------ !reader WARNING: kernel/trace/ring_buffer.c:7998 at ring_buffer_map_get_reader+0x5f3/0x930 kernel/trace/ring_buffer.c:7998, CPU#1: syz-executor388/6024 Modules linked in: CPU: 1 UID: 0 PID: 6024 Comm: syz-executor388 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:ring_buffer_map_get_reader+0x5f3/0x930 kernel/trace/ring_buffer.c:7998 Code: ff 48 89 df e8 be 22 fe ff 48 89 c5 e8 a6 88 fb ff 48 85 ed 0f 85 9f fc ff ff 4c 8b 74 24 58 4c 8b 7c 24 60 e8 8e 88 fb ff 90 <0f> 0b 90 e8 85 88 fb ff 49 8d bf d0 01 00 00 48 b8 00 00 00 00 00 RSP: 0018:ffffc90003977d98 EFLAGS: 00010093 RAX: 0000000000000000 RBX: ffff88801c0e5000 RCX: 0000000000000001 RDX: ffff8880333d4b00 RSI: ffffffff82108882 RDI: ffff8880333d4b00 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88801c0e50b0 R12: ffff88801c0e50b8 R13: dffffc0000000000 R14: ffff88801c0e5198 R15: ffff88801c0ab800 FS: 00007f337024b6c0(0000) GS:ffff8880d5c5d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000559c2c45caa0 CR3: 000000003dec3000 CR4: 0000000000352ef0 Call Trace: tracing_buffers_ioctl+0x2e6/0x3d0 kernel/trace/trace.c:7381 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3370a8136b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007f337024b130 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f337024bcdc RCX: 00007f3370a8136b RDX: 0000000000000000 RSI: 0000000000005220 RDI: 0000000000000004 RBP: 0000000000000021 R08: 0000000000000000 R09: 00007f337024b6c0 R10: 0000000000000008 R11: 0000000000000246 R12: ffffffffffffffd0 R13: 0000000000000000 R14: 00007ffc1cde9710 R15: 00007ffc1cde97f8 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.