====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.74/4534 is trying to acquire lock: ffff8880600ceab8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_init_acl+0x307/0x770 fs/ocfs2/acl.c:365 but task is already holding lock: ffff8880631458e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 ocfs2_mknod+0xf5a/0x2510 fs/ocfs2/namei.c:361 vfs_mknod+0x424/0x4c0 fs/namei.c:3952 unix_bind_bsd net/unix/af_unix.c:1087 [inline] unix_bind+0x4e0/0x8f0 net/unix/af_unix.c:1175 __sys_bind+0x2e9/0x3e0 net/socket.c:1729 __do_sys_bind net/socket.c:1740 [inline] __se_sys_bind net/socket.c:1738 [inline] __x64_sys_bind+0x76/0x80 net/socket.c:1738 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (sb_internal#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1928 [inline] ocfs2_start_trans+0x2a7/0x6f0 fs/ocfs2/journal.c:372 ocfs2_xattr_set+0xeb0/0x13e0 fs/ocfs2/xattr.c:3647 __vfs_removexattr+0x3b7/0x3f0 fs/xattr.c:470 __vfs_removexattr_locked+0x1e4/0x230 fs/xattr.c:505 vfs_removexattr+0x7d/0x1b0 fs/xattr.c:527 ovl_do_removexattr fs/overlayfs/overlayfs.h:231 [inline] ovl_removexattr fs/overlayfs/overlayfs.h:239 [inline] ovl_make_workdir fs/overlayfs/super.c:1443 [inline] ovl_get_workdir+0xa63/0x1230 fs/overlayfs/super.c:1526 ovl_fill_super+0x1824/0x2a30 fs/overlayfs/super.c:2082 mount_nodev+0x52/0xe0 fs/super.c:1446 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x24a/0xa40 fs/namespace.c:3034 do_mount fs/namespace.c:3377 [inline] __do_sys_mount fs/namespace.c:3585 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&oi->ip_xattr_sem){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_init_acl+0x307/0x770 fs/ocfs2/acl.c:365 ocfs2_mknod+0x15cb/0x2510 fs/ocfs2/namei.c:410 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x11db/0x2fa0 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x150/0x4b0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_creat fs/open.c:1347 [inline] __se_sys_creat fs/open.c:1341 [inline] __x64_sys_creat+0x8c/0xb0 fs/open.c:1341 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &oi->ip_xattr_sem --> sb_internal#2 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_trans_barrier); lock(sb_internal#2); lock(&journal->j_trans_barrier); lock(&oi->ip_xattr_sem); *** DEADLOCK *** 8 locks held by syz.3.74/4534: #0: ffff888024394460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:386 #1: ffff8880600ced88 (&type->i_mutex_dir_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff8880600ced88 (&type->i_mutex_dir_key#15){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3537 [inline] #1: ffff8880600ced88 (&type->i_mutex_dir_key#15){+.+.}-{3:3}, at: path_openat+0x803/0x2fa0 fs/namei.c:3747 #2: ffff888075b42648 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #2: ffff888075b42648 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x16a/0x44d0 fs/ocfs2/suballoc.c:782 #3: ffff888075b41808 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #3: ffff888075b41808 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x16a/0x44d0 fs/ocfs2/suballoc.c:782 #4: ffff888075b442c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #4: ffff888075b442c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#4){+.+.}-{3:3}, at: ocfs2_reserve_local_alloc_bits+0x11c/0x25f0 fs/ocfs2/localalloc.c:635 #5: ffff888024394650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_mknod+0xf5a/0x2510 fs/ocfs2/namei.c:361 #6: ffff8880631458e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 #7: ffff888059916990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x134c/0x15c0 fs/jbd2/transaction.c:462 stack backtrace: CPU: 1 PID: 4534 Comm: syz.3.74 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_init_acl+0x307/0x770 fs/ocfs2/acl.c:365 ocfs2_mknod+0x15cb/0x2510 fs/ocfs2/namei.c:410 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x11db/0x2fa0 fs/namei.c:3747 do_filp_open+0x1e2/0x410 fs/namei.c:3777 do_sys_openat2+0x150/0x4b0 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_creat fs/open.c:1347 [inline] __se_sys_creat fs/open.c:1341 [inline] __x64_sys_creat+0x8c/0xb0 fs/open.c:1341 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f0908003cb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f090625f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f090827efa0 RCX: 00007f0908003cb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000040 RBP: 00007f0908071bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f090827f038 R14: 00007f090827efa0 R15: 00007ffef6b891d8 syz.3.74 (4534) used greatest stack depth: 19992 bytes left