linux-kernel - Re: [syzbot] [trace?] WARNING in tracing_buffers_mmap

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Message-ID: <6913ca42.a70a0220.22f260.014e.GAE@google.com>
Date: Tue, 11 Nov 2025 15:44:02 -0800
From: syzbot <syzbot+a72c325b042aae6403c7@...kaller.appspotmail.com>
To: hdanton@...a.com, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [trace?] WARNING in tracing_buffers_mmap_close (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in tracing_buffers_mmap_close

------------[ cut here ]------------
WARNING: CPU: 0 PID: 6465 at kernel/trace/trace.c:8780 tracing_buffers_mmap_close kernel/trace/trace.c:8780 [inline]
WARNING: CPU: 0 PID: 6465 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: 6465 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 92 94 ff ff 31 ff 89 c3 89 c6 e8 e7 4a fb ff 85 db 75 0a 48 83 c4 08 5b e9 99 4f fb ff e8 94 4f fb ff 90 <0f> 0b 90 48 83 c4 08 5b e9 86 4f fb ff e8 51 f9 62 00 eb 87 e8 7a
RSP: 0018:ffffc900033a7980 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000ffffffed RCX: ffffffff81c108d9
RDX: ffff88802f3b0000 RSI: ffffffff81c108ec RDI: 0000000000000005
RBP: ffffffff81c10810 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffed R11: 0000000000000000 R12: ffff888046203408
R13: dffffc0000000000 R14: ffffc900033a7a08 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888124a0d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f36505f5f98 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
 get_signal+0x2671/0x26d0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x8f/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x85/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x426/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3650f8f6c9
Code: Unable to access opcode bytes at 0x7f3650f8f69f.
RSP: 002b:00007f36505f60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f36511e5fa8 RCX: 00007f3650f8f6c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f36511e5fa8
RBP: 00007f36511e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f36511e6038 R14: 00007ffdf110f910 R15: 00007ffdf110f9f8
 </TASK>


Tested on:

commit:         24172e0d Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13370212580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=19d831c6d0386a9c
dashboard link: https://syzkaller.appspot.com/bug?extid=a72c325b042aae6403c7
compiler:       gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=135b560a580000