syzbot


WARNING in tracing_buffers_mmap_close (2)

Status: upstream: reported C repro on 2025/11/11 17:05
Subsystems: trace
[Documentation on labels]
Reported-by: syzbot+a72c325b042aae6403c7@syzkaller.appspotmail.com
First crash: 12d, last: 11d
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] tracing: Fix WARN_ON in tracing_buffers_mmap_close for split VMAs 1 (1) 2025/11/19 06:40
[syzbot] [trace?] WARNING in tracing_buffers_mmap_close (2) 1 (5) 2025/11/19 06:14
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in tracing_buffers_mmap_close trace -1 C 1378 41d 338d 29/29 fixed on 2025/10/29 21:02
Last patch testing requests (3)
Created Duration User Patch Repo Result
2025/11/19 06:14 22m kartikey406@gmail.com patch upstream OK log
2025/11/19 05:51 22m kartikey406@gmail.com patch upstream OK log
2025/11/11 23:27 15m hdanton@sina.com patch upstream report log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5989 at kernel/trace/trace.c:8780 tracing_buffers_mmap_close kernel/trace/trace.c:8780 [inline]
WARNING: CPU: 0 PID: 5989 at kernel/trace/trace.c:8780 tracing_buffers_mmap_close+0xdd/0x130 kernel/trace/trace.c:8775
Modules linked in:
CPU: 0 UID: 0 PID: 5989 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:tracing_buffers_mmap_close kernel/trace/trace.c:8780 [inline]
RIP: 0010:tracing_buffers_mmap_close+0xdd/0x130 kernel/trace/trace.c:8775
Code: 75 46 48 8b 7b 08 e8 b2 94 ff ff 31 ff 89 c3 89 c6 e8 07 4b fb ff 85 db 75 0a 48 83 c4 08 5b e9 b9 4f fb ff e8 b4 4f fb ff 90 <0f> 0b 90 48 83 c4 08 5b e9 a6 4f fb ff e8 b1 e6 62 00 eb 87 e8 da
RSP: 0018:ffffc90003047ba8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000ffffffed RCX: ffffffff81c11d89
RDX: ffff888020713c80 RSI: ffffffff81c11d9c RDI: 0000000000000005
RBP: ffffffff81c11cc0 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffed R11: 0000000000000000 R12: ffff8880217512c8
R13: dffffc0000000000 R14: ffffc90003047c30 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124a0d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555606ff808 CR3: 000000000e182000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vma_close mm/internal.h:190 [inline]
 remove_vma+0x88/0x160 mm/vma.c:464
 exit_mmap+0x50a/0xb90 mm/mmap.c:1305
 __mmput+0x12a/0x410 kernel/fork.c:1133
 mmput+0x62/0x70 kernel/fork.c:1156
 exit_mm kernel/exit.c:582 [inline]
 do_exit+0x7c7/0x2bf0 kernel/exit.c:954
 do_group_exit+0xd3/0x2a0 kernel/exit.c:1107
 __do_sys_exit_group kernel/exit.c:1118 [inline]
 __se_sys_exit_group kernel/exit.c:1116 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1116
 x64_sys_call+0x150b/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
 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: 0033:0x7f168a18f6c9
Code: Unable to access opcode bytes at 0x7f168a18f69f.
RSP: 002b:00007ffff8c604f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f168a18f6c9
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 00000004f8c605ef R09: 00007f168a3b1280
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f168a3b1280 R14: 0000000000000003 R15: 00007ffff8c605b0
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/11/07 19:29 upstream 4a0c9b339199 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in tracing_buffers_mmap_close
2025/11/07 18:13 upstream 4a0c9b339199 4e1406b4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in tracing_buffers_mmap_close
2025/11/07 16:56 upstream 4a0c9b339199 4e1406b4 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in tracing_buffers_mmap_close
* Struck through repros no longer work on HEAD.