linux-kernel - [syzbot] [kernel?] WARNING in try_check

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Message-ID: <00000000000098bb530618e60313@google.com>
Date: Mon, 20 May 2024 10:27:22 -0700
From: syzbot <syzbot+8f70859e7bdfbdc69bda@...kaller.appspotmail.com>
To: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, 
	linux-kernel@...r.kernel.org, mingo@...hat.com, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: [syzbot] [kernel?] WARNING in try_check_zero

Hello,

syzbot found the following issue on:

HEAD commit:    eb6a9339efeb Merge tag 'mm-nonmm-stable-2024-05-19-11-56' ..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12a0c2b2980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e2ea586e11acd6ec
dashboard link: https://syzkaller.appspot.com/bug?extid=8f70859e7bdfbdc69bda
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: i386

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-eb6a9339.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/21782c1528d1/vmlinux-eb6a9339.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6c377678e8b1/bzImage-eb6a9339.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f70859e7bdfbdc69bda@...kaller.appspotmail.com

------------[ cut here ]------------
Mixed NMI-safe readers for srcu_struct at 0xffffc9000dac28a8.
WARNING: CPU: 3 PID: 1945 at kernel/rcu/srcutree.c:453 srcu_readers_unlock_idx kernel/rcu/srcutree.c:453 [inline]
WARNING: CPU: 3 PID: 1945 at kernel/rcu/srcutree.c:453 srcu_readers_active_idx_check kernel/rcu/srcutree.c:466 [inline]
WARNING: CPU: 3 PID: 1945 at kernel/rcu/srcutree.c:453 try_check_zero+0x3aa/0x560 kernel/rcu/srcutree.c:1078
Modules linked in:
CPU: 3 PID: 1945 Comm: kworker/3:2 Not tainted 6.9.0-syzkaller-09699-geb6a9339efeb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: rcu_gp process_srcu
RIP: 0010:srcu_readers_unlock_idx kernel/rcu/srcutree.c:453 [inline]
RIP: 0010:srcu_readers_active_idx_check kernel/rcu/srcutree.c:466 [inline]
RIP: 0010:try_check_zero+0x3aa/0x560 kernel/rcu/srcutree.c:1078
Code: e9 8a fe ff ff 80 3d 6e 4b 57 0e 00 0f 85 47 fe ff ff c6 05 61 4b 57 0e 01 90 48 c7 c7 a0 42 2e 8b 4c 89 f6 e8 e7 8e dc ff 90 <0f> 0b 90 90 e9 26 fe ff ff 48 83 c4 48 31 c0 5b 5d 41 5c 41 5d 41
RSP: 0018:ffffc9000d44fb70 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffe8ffffd5c100 RCX: ffffffff81510229
RDX: ffff888021a14880 RSI: ffffffff81510236 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: 000000000000001d
R13: dffffc0000000000 R14: ffffc9000dac28a8 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88802c300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002054b000 CR3: 000000001e250000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 srcu_advance_state kernel/rcu/srcutree.c:1684 [inline]
 process_srcu+0x3f9/0x1730 kernel/rcu/srcutree.c:1811
 process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x6c8/0xf70 kernel/workqueue.c:3393
 kthread+0x2c1/0x3a0 kernel/kthread.c:389
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>


---
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