[v6.6] possible deadlock in ocfs2_init_acl

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syzbot

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Jun 17, 2025, 1:21:21 AM6/17/25
to syzkaller...@googlegroups.com
Hello,

syzbot found the following issue on:

HEAD commit: c2603c511feb Linux 6.6.93
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16afc90c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=486bade17c8c30b9
dashboard link: https://syzkaller.appspot.com/bug?extid=b011264359b86db8878a
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8754f950a6e7/disk-c2603c51.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3b19332dbf63/vmlinux-c2603c51.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cb245e836038/bzImage-c2603c51.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b01126...@syzkaller.appspotmail.com

ocfs2: Mounting device (7,2) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
6.6.93-syzkaller #0 Not tainted
------------------------------------------------------
syz.2.3506/18699 is trying to acquire lock:
ffff88805a9406f8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366

but task is already holding lock:
ffff88804f0be990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1e7d/0x20c0 fs/jbd2/transaction.c:448

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (jbd2_handle){++++}-{0:0}:
start_this_handle+0x1e9d/0x20c0 fs/jbd2/transaction.c:448
jbd2__journal_start+0x2bb/0x5b0 fs/jbd2/transaction.c:505
jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:544
ocfs2_start_trans+0x376/0x6c0 fs/ocfs2/journal.c:374
ocfs2_mknod+0xe47/0x20f0 fs/ocfs2/namei.c:361
ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674
lookup_open fs/namei.c:3488 [inline]
open_last_lookups fs/namei.c:3556 [inline]
path_openat+0x1277/0x3190 fs/namei.c:3786
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_open fs/open.c:1442 [inline]
__se_sys_open fs/open.c:1438 [inline]
__x64_sys_open+0x11f/0x140 fs/open.c:1438
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #3 (&journal->j_trans_barrier){.+.+}-{3:3}:
down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372
ocfs2_mknod+0xe47/0x20f0 fs/ocfs2/namei.c:361
ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674
lookup_open fs/namei.c:3488 [inline]
open_last_lookups fs/namei.c:3556 [inline]
path_openat+0x1277/0x3190 fs/namei.c:3786
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_open fs/open.c:1442 [inline]
__se_sys_open fs/open.c:1438 [inline]
__x64_sys_open+0x11f/0x140 fs/open.c:1438
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #2 (sb_internal#3){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1633 [inline]
sb_start_intwrite include/linux/fs.h:1755 [inline]
ocfs2_start_trans+0x26b/0x6c0 fs/ocfs2/journal.c:370
ocfs2_orphan_for_truncate fs/ocfs2/file.c:396 [inline]
ocfs2_truncate_file+0x611/0x13a0 fs/ocfs2/file.c:500
ocfs2_setattr+0x150d/0x1b20 fs/ocfs2/file.c:1211
notify_change+0xb0d/0xe10 fs/attr.c:499
do_truncate+0x19b/0x220 fs/open.c:66
handle_truncate fs/namei.c:3291 [inline]
do_open fs/namei.c:3636 [inline]
path_openat+0x298c/0x3190 fs/namei.c:3789
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_creat fs/open.c:1512 [inline]
__se_sys_creat fs/open.c:1506 [inline]
__x64_sys_creat+0x90/0xb0 fs/open.c:1506
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&oi->ip_alloc_sem){++++}-{3:3}:
down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573
ocfs2_try_remove_refcount_tree+0xb7/0x320 fs/ocfs2/refcounttree.c:932
ocfs2_truncate_file+0xd84/0x13a0 fs/ocfs2/file.c:521
ocfs2_setattr+0x150d/0x1b20 fs/ocfs2/file.c:1211
notify_change+0xb0d/0xe10 fs/attr.c:499
do_truncate+0x19b/0x220 fs/open.c:66
handle_truncate fs/namei.c:3291 [inline]
do_open fs/namei.c:3636 [inline]
path_openat+0x298c/0x3190 fs/namei.c:3789
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_creat fs/open.c:1512 [inline]
__se_sys_creat fs/open.c:1506 [inline]
__x64_sys_creat+0x90/0xb0 fs/open.c:1506
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&oi->ip_xattr_sem){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366
ocfs2_mknod+0x12e5/0x20f0 fs/ocfs2/namei.c:410
ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674
lookup_open fs/namei.c:3488 [inline]
open_last_lookups fs/namei.c:3556 [inline]
path_openat+0x1277/0x3190 fs/namei.c:3786
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_openat fs/open.c:1450 [inline]
__se_sys_openat fs/open.c:1445 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1445
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
&oi->ip_xattr_sem --> &journal->j_trans_barrier --> jbd2_handle

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
rlock(jbd2_handle);
lock(&journal->j_trans_barrier);
lock(jbd2_handle);
rlock(&oi->ip_xattr_sem);

*** DEADLOCK ***

8 locks held by syz.2.3506/18699:
#0: ffff8880204ee418 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403
#1: ffff88805a9409d8 (&type->i_mutex_dir_key#12){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#1: ffff88805a9409d8 (&type->i_mutex_dir_key#12){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3553 [inline]
#1: ffff88805a9409d8 (&type->i_mutex_dir_key#12){+.+.}-{3:3}, at: path_openat+0x7c6/0x3190 fs/namei.c:3786
#2: ffff88805a9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#2: ffff88805a9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782
#3: ffff88805a9c6d98 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#3: ffff88805a9c6d98 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782
#4: ffff88805a9c5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#4: ffff88805a9c5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: ocfs2_reserve_local_alloc_bits+0x126/0x24b0 fs/ocfs2/localalloc.c:635
#5: ffff8880204ee608 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_mknod+0xe47/0x20f0 fs/ocfs2/namei.c:361
#6: ffff88807de3d4e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372
#7: ffff88804f0be990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1e7d/0x20c0 fs/jbd2/transaction.c:448

stack backtrace:
CPU: 1 PID: 18699 Comm: syz.2.3506 Not tainted 6.6.93-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366
ocfs2_mknod+0x12e5/0x20f0 fs/ocfs2/namei.c:410
ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674
lookup_open fs/namei.c:3488 [inline]
open_last_lookups fs/namei.c:3556 [inline]
path_openat+0x1277/0x3190 fs/namei.c:3786
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_openat fs/open.c:1450 [inline]
__se_sys_openat fs/open.c:1445 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1445
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f279078e929
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:00007f27915ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f27909b5fa0 RCX: 00007f279078e929
RDX: 00000000000e6bc1 RSI: 00002000000001c0 RDI: ffffffffffffff9c
RBP: 00007f2790810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000004e R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f27909b5fa0 R15: 00007ffc5b823c98
</TASK>


---
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If the report is already addressed, let syzbot know by replying with:
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syzbot

unread,
Aug 6, 2025, 11:36:38 AM8/6/25
to syzkaller...@googlegroups.com
syzbot has found a reproducer for the following issue on:

HEAD commit: 3a8ababb8b6a Linux 6.6.101
git tree: linux-6.6.y
console output: https://syzkaller.appspot.com/x/log.txt?x=132cc6a2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2bd95b6de4839b7
dashboard link: https://syzkaller.appspot.com/bug?extid=b011264359b86db8878a
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=172cc6a2580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160356a2580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f06c672f5fa8/disk-3a8ababb.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9af9b7afcdc5/vmlinux-3a8ababb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/351a55aafa77/bzImage-3a8ababb.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/7bbbe4d9b657/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=13e8e042580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b01126...@syzkaller.appspotmail.com

(syz.0.17,5937,1):ocfs2_block_check_validate:402 ERROR: CRC32 failed: stored: 0xb3775c19, computed 0x2dd1c265. Applying ECC.
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
6.6.101-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/5937 is trying to acquire lock:
ffff8880604586f8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366

but task is already holding lock:
ffff88802ddee990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1e7d/0x20c0 fs/jbd2/transaction.c:448

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (jbd2_handle){++++}-{0:0}:
start_this_handle+0x1e9d/0x20c0 fs/jbd2/transaction.c:448
jbd2__journal_start+0x2bb/0x5b0 fs/jbd2/transaction.c:505
jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:544
ocfs2_start_trans+0x376/0x6c0 fs/ocfs2/journal.c:374
ocfs2_modify_bh+0xe9/0x470 fs/ocfs2/quota_local.c:101
ocfs2_local_read_info+0x13fd/0x1770 fs/ocfs2/quota_local.c:764
dquot_load_quota_sb+0x757/0xb80 fs/quota/dquot.c:2468
dquot_load_quota_inode+0x2dc/0x5d0 fs/quota/dquot.c:2505
ocfs2_enable_quotas+0x1c7/0x440 fs/ocfs2/super.c:926
ocfs2_fill_super+0x3f6d/0x4d90 fs/ocfs2/super.c:1141
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3371
do_mount fs/namespace.c:3711 [inline]
__do_sys_mount fs/namespace.c:3920 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #3 (&journal->j_trans_barrier){.+.+}-{3:3}:
down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372
ocfs2_modify_bh+0xe9/0x470 fs/ocfs2/quota_local.c:101
ocfs2_local_read_info+0x13fd/0x1770 fs/ocfs2/quota_local.c:764
dquot_load_quota_sb+0x757/0xb80 fs/quota/dquot.c:2468
dquot_load_quota_inode+0x2dc/0x5d0 fs/quota/dquot.c:2505
ocfs2_enable_quotas+0x1c7/0x440 fs/ocfs2/super.c:926
ocfs2_fill_super+0x3f6d/0x4d90 fs/ocfs2/super.c:1141
mount_bdev+0x22b/0x2d0 fs/super.c:1643
legacy_get_tree+0xea/0x180 fs/fs_context.c:662
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3371
do_mount fs/namespace.c:3711 [inline]
__do_sys_mount fs/namespace.c:3920 [inline]
__se_sys_mount+0x2da/0x3c0 fs/namespace.c:3897
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #2 (sb_internal#2){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1633 [inline]
sb_start_intwrite include/linux/fs.h:1755 [inline]
ocfs2_start_trans+0x26b/0x6c0 fs/ocfs2/journal.c:370
ocfs2_xattr_set+0xd66/0x11f0 fs/ocfs2/xattr.c:3643
ocfs2_set_acl+0x4e1/0x590 fs/ocfs2/acl.c:254
ocfs2_iop_set_acl+0x1ab/0x2a0 fs/ocfs2/acl.c:286
set_posix_acl fs/posix_acl.c:956 [inline]
vfs_set_acl+0x803/0xa60 fs/posix_acl.c:1135
do_set_acl+0xf5/0x180 fs/posix_acl.c:1280
do_setxattr fs/xattr.c:627 [inline]
path_setxattr+0x39f/0x550 fs/xattr.c:659
__do_sys_setxattr fs/xattr.c:677 [inline]
__se_sys_setxattr fs/xattr.c:673 [inline]
__x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}:
down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573
inode_lock include/linux/fs.h:804 [inline]
ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782
ocfs2_reserve_new_metadata_blocks+0x404/0x940 fs/ocfs2/suballoc.c:978
ocfs2_init_xattr_set_ctxt+0x2f8/0x6e0 fs/ocfs2/xattr.c:3277
ocfs2_xattr_set+0xb6d/0x11f0 fs/ocfs2/xattr.c:3634
ocfs2_set_acl+0x4e1/0x590 fs/ocfs2/acl.c:254
ocfs2_iop_set_acl+0x1ab/0x2a0 fs/ocfs2/acl.c:286
set_posix_acl fs/posix_acl.c:956 [inline]
vfs_set_acl+0x803/0xa60 fs/posix_acl.c:1135
do_set_acl+0xf5/0x180 fs/posix_acl.c:1280
do_setxattr fs/xattr.c:627 [inline]
path_setxattr+0x39f/0x550 fs/xattr.c:659
__do_sys_setxattr fs/xattr.c:677 [inline]
__se_sys_setxattr fs/xattr.c:673 [inline]
__x64_sys_setxattr+0xbb/0xd0 fs/xattr.c:673
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&oi->ip_xattr_sem){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366
ocfs2_mknod+0x12e5/0x20f0 fs/ocfs2/namei.c:410
ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674
lookup_open fs/namei.c:3488 [inline]
open_last_lookups fs/namei.c:3556 [inline]
path_openat+0x1277/0x3190 fs/namei.c:3786
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_creat fs/open.c:1512 [inline]
__se_sys_creat fs/open.c:1506 [inline]
__x64_sys_creat+0x90/0xb0 fs/open.c:1506
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
&oi->ip_xattr_sem --> &journal->j_trans_barrier --> jbd2_handle

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
rlock(jbd2_handle);
lock(&journal->j_trans_barrier);
lock(jbd2_handle);
rlock(&oi->ip_xattr_sem);

*** DEADLOCK ***

8 locks held by syz.0.17/5937:
#0: ffff88806fb4a418 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403
#1: ffff8880604589d8 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#1: ffff8880604589d8 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3553 [inline]
#1: ffff8880604589d8 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: path_openat+0x7c6/0x3190 fs/namei.c:3786
#2: ffff88806054c2d8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#2: ffff88806054c2d8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782
#3: ffff88806054b498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#3: ffff88806054b498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x165/0x4360 fs/ocfs2/suballoc.c:782
#4: ffff88806054df58 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#4: ffff88806054df58 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}, at: ocfs2_reserve_local_alloc_bits+0x126/0x24b0 fs/ocfs2/localalloc.c:635
#5: ffff88806fb4a608 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_mknod+0xe47/0x20f0 fs/ocfs2/namei.c:361
#6: ffff88802483b8e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372
#7: ffff88802ddee990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1e7d/0x20c0 fs/jbd2/transaction.c:448

stack backtrace:
CPU: 1 PID: 5937 Comm: syz.0.17 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3869 [inline]
__lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520
ocfs2_init_acl+0x2fa/0x720 fs/ocfs2/acl.c:366
ocfs2_mknod+0x12e5/0x20f0 fs/ocfs2/namei.c:410
ocfs2_create+0x196/0x410 fs/ocfs2/namei.c:674
lookup_open fs/namei.c:3488 [inline]
open_last_lookups fs/namei.c:3556 [inline]
path_openat+0x1277/0x3190 fs/namei.c:3786
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_creat fs/open.c:1512 [inline]
__se_sys_creat fs/open.c:1506 [inline]
__x64_sys_creat+0x90/0xb0 fs/open.c:1506
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f20cab8ebe9
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:00007ffd595ce698 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f20cadb5fa0 RCX: 00007f20cab8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000000
RBP: 00007f20cac11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f20cadb5fa0 R14: 00007f20cadb5fa0 R15: 0000000000000002
</TASK>


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