From: syzbot <syzbot+0f3b07683129d8b11141@syzkaller.appspotmail.com>
To: jlbec@evilplan.org, joseph.qi@linux.alibaba.com,
linux-kernel@vger.kernel.org, mark@fasheh.com,
ocfs2-devel@lists.linux.dev, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [ocfs2?] possible deadlock in ocfs2_xattr_ibody_find (2)
Date: Fri, 22 Aug 2025 01:08:38 -0700 [thread overview]
Message-ID: <68a82586.a00a0220.33401d.0250.GAE@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 8f5ae30d69d7 Linux 6.17-rc1
git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=1349f442580000
kernel config: https://syzkaller.appspot.com/x/.config?x=8c5ac3d8b8abfcb
dashboard link: https://syzkaller.appspot.com/bug?extid=0f3b07683129d8b11141
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/18a2e4bd0c4a/disk-8f5ae30d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3b5395881b25/vmlinux-8f5ae30d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e875f4e3b7ff/Image-8f5ae30d.gz.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0f3b07683129d8b11141@syzkaller.appspotmail.com
loop3: detected capacity change from 0 to 262144
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,3) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 Not tainted
------------------------------------------------------
syz.3.387/8571 is trying to acquire lock:
ffff0000ddea94a0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_xattr_ibody_find+0x100/0x668 fs/ocfs2/xattr.c:2689
but task is already holding lock:
ffff0000ddea9538 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set_handle+0x2a8/0x5e4 fs/ocfs2/xattr.c:3501
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #6 (&oi->ip_xattr_sem){++++}-{4:4}:
down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537
ocfs2_xattr_get+0xe8/0x220 fs/ocfs2/xattr.c:1338
ocfs2_xattr_security_get+0x40/0x54 fs/ocfs2/xattr.c:7231
__vfs_getxattr+0x394/0x3c0 fs/xattr.c:423
smk_fetch+0xc4/0x150 security/smack/smack_lsm.c:289
smack_d_instantiate+0x53c/0x7a4 security/smack/smack_lsm.c:3606
security_d_instantiate+0x100/0x204 security/security.c:4109
d_instantiate+0x5c/0x9c fs/dcache.c:1961
ocfs2_mknod+0x151c/0x1cf0 fs/ocfs2/namei.c:453
ocfs2_mkdir+0x190/0x474 fs/ocfs2/namei.c:659
vfs_mkdir+0x284/0x424 fs/namei.c:4366
do_mkdirat+0x1f8/0x4c8 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4414
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
-> #5 (jbd2_handle){++++}-{0:0}:
start_this_handle+0xe74/0x10dc fs/jbd2/transaction.c:444
jbd2__journal_start+0x288/0x51c fs/jbd2/transaction.c:501
jbd2_journal_start+0x3c/0x4c fs/jbd2/transaction.c:540
ocfs2_start_trans+0x368/0x6b0 fs/ocfs2/journal.c:374
ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1254 [inline]
ocfs2_reserve_local_alloc_bits+0xba8/0x26a0 fs/ocfs2/localalloc.c:669
ocfs2_reserve_clusters_with_limit+0x198/0x9e0 fs/ocfs2/suballoc.c:1168
ocfs2_reserve_clusters+0x3c/0x50 fs/ocfs2/suballoc.c:1229
ocfs2_mknod+0xc00/0x1cf0 fs/ocfs2/namei.c:357
ocfs2_mkdir+0x190/0x474 fs/ocfs2/namei.c:659
vfs_mkdir+0x284/0x424 fs/namei.c:4366
do_mkdirat+0x1f8/0x4c8 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4414
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
-> #4 (&journal->j_trans_barrier){.+.+}-{4:4}:
down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537
ocfs2_start_trans+0x35c/0x6b0 fs/ocfs2/journal.c:372
ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1254 [inline]
ocfs2_reserve_local_alloc_bits+0xba8/0x26a0 fs/ocfs2/localalloc.c:669
ocfs2_reserve_clusters_with_limit+0x198/0x9e0 fs/ocfs2/suballoc.c:1168
ocfs2_reserve_clusters+0x3c/0x50 fs/ocfs2/suballoc.c:1229
ocfs2_mknod+0xc00/0x1cf0 fs/ocfs2/namei.c:357
ocfs2_mkdir+0x190/0x474 fs/ocfs2/namei.c:659
vfs_mkdir+0x284/0x424 fs/namei.c:4366
do_mkdirat+0x1f8/0x4c8 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4414
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
-> #3 (sb_internal#6){.+.+}-{0:0}:
percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
__sb_start_write include/linux/fs.h:1798 [inline]
sb_start_intwrite include/linux/fs.h:1981 [inline]
ocfs2_start_trans+0x1f4/0x6b0 fs/ocfs2/journal.c:370
ocfs2_expand_inline_dir fs/ocfs2/dir.c:2875 [inline]
ocfs2_extend_dir+0xbc0/0x3964 fs/ocfs2/dir.c:3207
ocfs2_prepare_dir_for_insert+0x281c/0x4664 fs/ocfs2/dir.c:4312
ocfs2_symlink+0x62c/0x1ff8 fs/ocfs2/namei.c:1875
vfs_symlink+0x138/0x288 fs/namei.c:4730
do_symlinkat+0x17c/0x360 fs/namei.c:4756
__do_sys_symlinkat fs/namei.c:4772 [inline]
__se_sys_symlinkat fs/namei.c:4769 [inline]
__arm64_sys_symlinkat+0x9c/0xb4 fs/namei.c:4769
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
-> #2 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:
down_write+0x50/0xc0 kernel/locking/rwsem.c:1590
inode_lock include/linux/fs.h:869 [inline]
ocfs2_reserve_local_alloc_bits+0x104/0x26a0 fs/ocfs2/localalloc.c:636
ocfs2_reserve_clusters_with_limit+0x198/0x9e0 fs/ocfs2/suballoc.c:1168
ocfs2_reserve_clusters+0x3c/0x50 fs/ocfs2/suballoc.c:1229
ocfs2_mknod+0xc00/0x1cf0 fs/ocfs2/namei.c:357
ocfs2_mkdir+0x190/0x474 fs/ocfs2/namei.c:659
vfs_mkdir+0x284/0x424 fs/namei.c:4366
do_mkdirat+0x1f8/0x4c8 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4414
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
-> #1 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:
down_write+0x50/0xc0 kernel/locking/rwsem.c:1590
inode_lock include/linux/fs.h:869 [inline]
ocfs2_reserve_suballoc_bits+0x12c/0x3b9c fs/ocfs2/suballoc.c:788
ocfs2_reserve_new_metadata_blocks+0x368/0x810 fs/ocfs2/suballoc.c:984
ocfs2_expand_inline_dir fs/ocfs2/dir.c:2845 [inline]
ocfs2_extend_dir+0x970/0x3964 fs/ocfs2/dir.c:3207
ocfs2_prepare_dir_for_insert+0x281c/0x4664 fs/ocfs2/dir.c:4312
ocfs2_mknod+0x6ec/0x1cf0 fs/ocfs2/namei.c:297
ocfs2_mkdir+0x190/0x474 fs/ocfs2/namei.c:659
vfs_mkdir+0x284/0x424 fs/namei.c:4366
do_mkdirat+0x1f8/0x4c8 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4414
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
-> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537
ocfs2_xattr_ibody_find+0x100/0x668 fs/ocfs2/xattr.c:2689
ocfs2_xattr_set_handle+0x2bc/0x5e4 fs/ocfs2/xattr.c:3503
ocfs2_init_security_set+0xb4/0xd8 fs/ocfs2/xattr.c:7307
ocfs2_mknod+0x106c/0x1cf0 fs/ocfs2/namei.c:422
ocfs2_create+0x190/0x474 fs/ocfs2/namei.c:676
lookup_open fs/namei.c:3708 [inline]
open_last_lookups fs/namei.c:3807 [inline]
path_openat+0x12d8/0x2c40 fs/namei.c:4043
do_filp_open+0x18c/0x36c fs/namei.c:4073
do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__arm64_sys_openat+0x120/0x158 fs/open.c:1461
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
other info that might help us debug this:
Chain exists of:
&ocfs2_file_ip_alloc_sem_key --> jbd2_handle --> &oi->ip_xattr_sem
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&oi->ip_xattr_sem);
lock(jbd2_handle);
lock(&oi->ip_xattr_sem);
rlock(&ocfs2_file_ip_alloc_sem_key);
*** DEADLOCK ***
9 locks held by syz.3.387/8571:
#0: ffff0000d7d5c428 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:557
#1: ffff0000ddc03480 (&type->i_mutex_dir_key#18){++++}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#1: ffff0000ddc03480 (&type->i_mutex_dir_key#18){++++}-{4:4}, at: open_last_lookups fs/namei.c:3804 [inline]
#1: ffff0000ddc03480 (&type->i_mutex_dir_key#18){++++}-{4:4}, at: path_openat+0x638/0x2c40 fs/namei.c:4043
#2: ffff0000f7d19800 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#2: ffff0000f7d19800 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x12c/0x3b9c fs/ocfs2/suballoc.c:788
#3: ffff0000f7d1a640 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#3: ffff0000f7d1a640 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x12c/0x3b9c fs/ocfs2/suballoc.c:788
#4: ffff0000ddeaed80 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline]
#4: ffff0000ddeaed80 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_local_alloc_bits+0x104/0x26a0 fs/ocfs2/localalloc.c:636
#5: ffff0000d7d5c618 (sb_internal#6){.+.+}-{0:0}, at: ocfs2_mknod+0xc50/0x1cf0 fs/ocfs2/namei.c:364
#6: ffff0000db9fc8e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x35c/0x6b0 fs/ocfs2/journal.c:372
#7: ffff0000c7ed0950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe4c/0x10dc fs/jbd2/transaction.c:442
#8: ffff0000ddea9538 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set_handle+0x2a8/0x5e4 fs/ocfs2/xattr.c:3501
stack backtrace:
CPU: 0 UID: 0 PID: 8571 Comm: syz.3.387 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
__dump_stack+0x30/0x40 lib/dump_stack.c:94
dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2043
check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2175
check_prev_add kernel/locking/lockdep.c:3165 [inline]
check_prevs_add kernel/locking/lockdep.c:3284 [inline]
validate_chain kernel/locking/lockdep.c:3908 [inline]
__lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237
lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868
down_read+0x58/0x2f8 kernel/locking/rwsem.c:1537
ocfs2_xattr_ibody_find+0x100/0x668 fs/ocfs2/xattr.c:2689
ocfs2_xattr_set_handle+0x2bc/0x5e4 fs/ocfs2/xattr.c:3503
ocfs2_init_security_set+0xb4/0xd8 fs/ocfs2/xattr.c:7307
ocfs2_mknod+0x106c/0x1cf0 fs/ocfs2/namei.c:422
ocfs2_create+0x190/0x474 fs/ocfs2/namei.c:676
lookup_open fs/namei.c:3708 [inline]
open_last_lookups fs/namei.c:3807 [inline]
path_openat+0x12d8/0x2c40 fs/namei.c:4043
do_filp_open+0x18c/0x36c fs/namei.c:4073
do_sys_openat2+0x11c/0x1b4 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__arm64_sys_openat+0x120/0x158 fs/open.c:1461
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879
el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
---
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reply other threads:[~2025-08-22 8:08 UTC|newest]
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