From: syzbot <syzbot+3e5130844b0c0e2b4948@syzkaller.appspotmail.com>
To: agruenba@redhat.com, gfs2@lists.linux.dev,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
postmaster@duagon.onmicrosoft.com, rpeterso@redhat.com,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [gfs2?] WARNING: suspicious RCU usage in gfs2_permission
Date: Wed, 18 Oct 2023 07:28:00 -0700 [thread overview]
Message-ID: <0000000000004467c80607fe72f1@google.com> (raw)
In-Reply-To: <0000000000000c44b0060760bd00@google.com>
syzbot has found a reproducer for the following issue on:
HEAD commit: 2dac75696c6d Add linux-next specific files for 20231018
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=13af5fe5680000
kernel config: https://syzkaller.appspot.com/x/.config?x=6f8545e1ef7a2b66
dashboard link: https://syzkaller.appspot.com/bug?extid=3e5130844b0c0e2b4948
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=101c8d09680000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11a07475680000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/2375f16ed327/disk-2dac7569.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c80aee6e2e6c/vmlinux-2dac7569.xz
kernel image: https://storage.googleapis.com/syzbot-assets/664dc23b738d/bzImage-2dac7569.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/5ce278ef6f36/mount_0.gz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3e5130844b0c0e2b4948@syzkaller.appspotmail.com
gfs2: fsid=syz:syz.0: first mount done, others may mount
=============================
WARNING: suspicious RCU usage
6.6.0-rc6-next-20231018-syzkaller #0 Not tainted
-----------------------------
fs/gfs2/inode.c:1877 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
no locks held by syz-executor120/5052.
stack backtrace:
CPU: 1 PID: 5052 Comm: syz-executor120 Not tainted 6.6.0-rc6-next-20231018-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x125/0x1b0 lib/dump_stack.c:106
lockdep_rcu_suspicious+0x20c/0x3b0 kernel/locking/lockdep.c:6711
gfs2_permission+0x3f9/0x4c0 fs/gfs2/inode.c:1877
do_inode_permission fs/namei.c:462 [inline]
inode_permission fs/namei.c:529 [inline]
inode_permission+0x384/0x5e0 fs/namei.c:504
may_open+0x11c/0x400 fs/namei.c:3249
do_open fs/namei.c:3619 [inline]
path_openat+0x17aa/0x2ce0 fs/namei.c:3778
do_filp_open+0x1de/0x430 fs/namei.c:3808
do_sys_openat2+0x176/0x1e0 fs/open.c:1440
do_sys_open fs/open.c:1455 [inline]
__do_sys_openat fs/open.c:1471 [inline]
__se_sys_openat fs/open.c:1466 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1466
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f5b23a31a11
Code: 75 57 89 f0 25 00 00 41 00 3d 00 00 41 00 74 49 80 3d 7a 06 0b 00 00 74 6d 89 da 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 93 00 00 00 48 8b 54 24 28 64 48 2b 14 25
RSP: 002b:00007ffe9ecd33a0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007f5b23a31a11
RDX: 0000000000010000 RSI: 0000000020037f80 RDI: 00000000ffffff9c
RBP: 0000000020037f80 R08: 00007ffe9ecd3470 R09: 0000000000037f13
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007ffe9ecd3470 R14: 0000000000000003 R15: 0000000001000000
</TASK>
---
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.
next prev parent reply other threads:[~2023-10-18 14:28 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-10 18:18 [syzbot] [gfs2?] WARNING: suspicious RCU usage in gfs2_permission syzbot
2023-10-18 14:28 ` syzbot [this message]
2023-10-20 7:10 ` syzbot
2023-10-25 3:21 ` Al Viro
2023-10-30 21:05 ` Andreas Gruenbacher
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