syzbot


WARNING in write_raw_marker_to_buffer

Status: upstream: reported C repro on 2025/10/10 21:00
Subsystems: trace
[Documentation on labels]
Reported-by: syzbot+9a2ede1643175f350105@syzkaller.appspotmail.com
Fix commit: bda745ee8fbb tracing: Fix tracing_mark_raw_write() to use buf and not ubuf 54b91e54b113 tracing: Stop fortify-string from warning in tracing_mark_raw_write()
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root ci2-upstream-fs ci2-upstream-kcsan-gce], missing on: [ci-qemu-native-arm64-kvm ci-qemu2-riscv64 ci-upstream-gce-arm64 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-usb]
First crash: 2d18h, last: 7h34m
Discussions (8)
Title Replies (including bot) Last reply
[PATCH 2/2] tracing: Stop fortify-string from warning in tracing_mark_raw_write() 2 (2) 2025/10/12 03:34
[syzbot] [trace?] WARNING in write_raw_marker_to_buffer 1 (2) 2025/10/12 03:26
[for-linus][PATCH v2 2/2] tracing: Stop fortify-string from warning in tracing_mark_raw_write() 1 (1) 2025/10/11 19:42
[for-linus][PATCH v2 1/2] tracing: Fix tracing_mark_raw_write() to use buf and not ubuf 1 (1) 2025/10/11 19:42
[PATCH v2] tracing: Stop fortify-string from warning in tracing_mark_raw_write() 1 (1) 2025/10/11 15:20
[PATCH 1/2] tracing: Fix tracing_mark_raw_write() to use buf and not ubuf 1 (1) 2025/10/11 03:51
[for-linus][PATCH 2/2] tracing: Stop fortify-string from warning in tracing_mark_raw_write() 1 (1) 2025/10/11 03:46
[for-linus][PATCH 1/2] tracing: Fix tracing_mark_raw_write() to use buf and not ubuf 1 (1) 2025/10/11 03:46

Sample crash report:
------------[ 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:
 <TASK>
 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
 </TASK>

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/10 02:46 upstream 5472d60c129f ff1712fe .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 02:21 upstream 5472d60c129f ff1712fe .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/12 10:30 upstream 98906f9d850e ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/12 10:18 upstream 98906f9d850e ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/12 09:26 upstream 98906f9d850e ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/12 04:38 upstream 98906f9d850e ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 21:22 upstream 0739473694c4 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 21:11 upstream 0739473694c4 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 20:33 upstream 0739473694c4 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 18:22 upstream 0739473694c4 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 16:24 upstream 0739473694c4 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 07:04 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 05:05 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 04:44 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 02:03 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 01:53 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 01:29 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/11 01:29 upstream 917167ed1211 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 17:05 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 15:37 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 13:19 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 11:46 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 10:47 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 10:18 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 10:12 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 07:42 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 07:26 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/10 06:11 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
2025/10/09 23:28 upstream 5472d60c129f ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in write_raw_marker_to_buffer
* Struck through repros no longer work on HEAD.