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Fri, 10 Oct 2025 14:00:37 -0700 (PDT) Date: Fri, 10 Oct 2025 14:00:37 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68e973f5.050a0220.1186a4.0010.GAE@google.com> Subject: [syzbot] [trace?] WARNING in write_raw_marker_to_buffer 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" Hello, syzbot found the following issue on: HEAD commit: 5472d60c129f Merge tag 'trace-v6.18-2' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1239b458580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e7dba95d4cdd903c dashboard link: https://syzkaller.appspot.com/bug?extid=9a2ede1643175f350105 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15eec52f980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=122e9892580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/fbf444614257/disk-5472d60c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f129612e3b8b/vmlinux-5472d60c.xz kernel image: https://storage.googleapis.com/syzbot-assets/8095ae997ffa/bzImage-5472d60c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9a2ede1643175f350105@syzkaller.appspotmail.com ------------[ cut here ]------------ memcpy: detected field-spanning write (size 2655) of single field "&entry->id" at kernel/trace/trace.c:7458 (size 4) WARNING: CPU: 0 PID: 6004 at kernel/trace/trace.c:7458 write_raw_marker_to_buffer.isra.0+0x2d4/0x330 kernel/trace/trace.c:7458 Modules linked in: CPU: 0 UID: 0 PID: 6004 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:write_raw_marker_to_buffer.isra.0+0x2d4/0x330 kernel/trace/trace.c:7458 Code: ff e8 30 74 fa ff c6 05 b4 7e aa 0e 01 90 b9 04 00 00 00 48 c7 c2 e0 1e 93 8b 4c 89 e6 48 c7 c7 40 1f 93 8b e8 6d fc b8 ff 90 <0f> 0b 90 90 e9 d7 fe ff ff e8 6e 04 62 00 e9 da fd ff ff e8 64 04 RSP: 0018:ffffc90003837c40 EFLAGS: 00010282 RAX: 0000000000000000 RBX: ffff88813ff34018 RCX: ffffffff817a5e58 RDX: ffff888031d73c80 RSI: ffffffff817a5e65 RDI: 0000000000000001 RBP: ffff88813ff34010 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000a5f R13: ffff88813ff18c00 R14: 0000000000000000 R15: 0000200000000040 FS: 000055558e5ff500(0000) GS:ffff8881249e6000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30263fff CR3: 0000000034638000 CR4: 00000000003526f0 Call Trace: tracing_mark_raw_write+0x2da/0x4a0 kernel/trace/trace.c:7500 vfs_write+0x2a0/0x11d0 fs/read_write.c:684 ksys_write+0x1f8/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f18a0b8eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2b2d2c28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f18a0de5fa0 RCX: 00007f18a0b8eec9 RDX: 0000000000000a5f RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f18a0c11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f18a0de5fa0 R14: 00007f18a0de5fa0 R15: 0000000000000003 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup