====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.1181/18272 is trying to acquire lock: ffff888061e05b90 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_xattr_set+0x4a4/0x13f0 fs/ocfs2/xattr.c:4032 but task is already holding lock: ffff888061e05c18 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x494/0x13f0 fs/ocfs2/xattr.c:4024 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&oi->ip_xattr_sem){++++}-{4:4}: down_read+0x92/0x200 kernel/locking/rwsem.c:1574 ocfs2_xattr_get+0xf4/0x260 fs/ocfs2/xattr.c:1716 __vfs_getxattr+0x412/0x440 fs/xattr.c:446 smk_fetch+0xb4/0x140 security/smack/smack_lsm.c:298 smack_d_instantiate+0x5bb/0x810 security/smack/smack_lsm.c:3682 security_d_instantiate+0x106/0x1d0 security/security.c:3782 d_instantiate+0x54/0xb0 fs/dcache.c:2267 ocfs2_mknod+0x199e/0x2190 fs/ocfs2/namei.c:453 ocfs2_mkdir+0x180/0x430 fs/ocfs2/namei.c:661 vfs_mkdir+0x417/0x670 fs/namei.c:5428 filename_mkdirat+0x288/0x560 fs/namei.c:5461 __do_sys_mkdirat fs/namei.c:5482 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5479 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x92/0x200 kernel/locking/rwsem.c:1574 ocfs2_start_trans+0x3aa/0x700 fs/ocfs2/journal.c:379 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1252 [inline] ocfs2_reserve_local_alloc_bits+0xb3e/0x2680 fs/ocfs2/localalloc.c:669 ocfs2_reserve_clusters_with_limit+0x1b9/0xc20 fs/ocfs2/suballoc.c:1284 ocfs2_mknod+0xea5/0x2190 fs/ocfs2/namei.c:357 ocfs2_mkdir+0x180/0x430 fs/ocfs2/namei.c:661 vfs_mkdir+0x417/0x670 fs/namei.c:5428 filename_mkdirat+0x288/0x560 fs/namei.c:5461 __do_sys_mkdirat fs/namei.c:5482 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5479 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sb_internal#3){.+.+}-{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/super.h:19 [inline] sb_start_intwrite include/linux/fs/super.h:177 [inline] ocfs2_start_trans+0x2a7/0x700 fs/ocfs2/journal.c:377 ocfs2_acquire_dquot+0x6ca/0xb70 fs/ocfs2/quota_global.c:874 dqget+0x72d/0xbe0 fs/quota/dquot.c:1018 __dquot_initialize+0x3c8/0xd40 fs/quota/dquot.c:1478 ocfs2_get_init_inode+0x147/0x1c0 fs/ocfs2/namei.c:206 ocfs2_mknod+0x8b0/0x2190 fs/ocfs2/namei.c:314 ocfs2_mkdir+0x180/0x430 fs/ocfs2/namei.c:661 vfs_mkdir+0x417/0x670 fs/namei.c:5428 filename_mkdirat+0x288/0x560 fs/namei.c:5461 __do_sys_mkdirat fs/namei.c:5482 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5479 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 down_write+0x35/0x50 kernel/locking/rwsem.c:1631 ocfs2_xattr_set+0x4a4/0x13f0 fs/ocfs2/xattr.c:4032 ocfs2_set_acl+0x6fd/0x7b0 fs/ocfs2/acl.c:254 ocfs2_iop_set_acl+0x1b1/0x2b0 fs/ocfs2/acl.c:286 set_posix_acl fs/posix_acl.c:960 [inline] vfs_remove_acl+0x5d8/0x8d0 fs/posix_acl.c:1247 ovl_do_remove_acl fs/overlayfs/overlayfs.h:366 [inline] ovl_workdir_create+0x58e/0x970 fs/overlayfs/super.c:390 ovl_make_workdir fs/overlayfs/super.c:718 [inline] ovl_get_workdir+0x339/0x1980 fs/overlayfs/super.c:876 ovl_fill_super_creds fs/overlayfs/super.c:1488 [inline] ovl_fill_super+0x1771/0x46a0 fs/overlayfs/super.c:1611 get_tree_super fs/super.c:1360 [inline] get_tree_nodev+0xbe/0x150 fs/super.c:1380 vfs_get_tree+0x92/0x2a0 fs/super.c:1881 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3986 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &ocfs2_quota_ip_alloc_sem_key --> &journal->j_trans_barrier --> &oi->ip_xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->ip_xattr_sem); lock(&journal->j_trans_barrier); lock(&oi->ip_xattr_sem); lock(&ocfs2_quota_ip_alloc_sem_key); *** DEADLOCK *** locks held by syz.3.1181/18272: 4, on CPU#1: #0: ffff888027af00f8 (&type->s_umount_key#83/1){+.+.}-{4:4}, at: alloc_super fs/super.c:347 [inline] #0: ffff888027af00f8 (&type->s_umount_key#83/1){+.+.}-{4:4}, at: sget_fc+0x9d5/0x1d00 fs/super.c:846 #1: ffff888026a2a528 (sb_writers#22){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:531 #2: ffff888061e05f40 (&sb->s_type->i_mutex_key#37){++++}-{4:4}, at: inode_lock include/linux/fs.h:1026 [inline] #2: ffff888061e05f40 (&sb->s_type->i_mutex_key#37){++++}-{4:4}, at: vfs_remove_acl+0x102/0x8d0 fs/posix_acl.c:1228 #3: ffff888061e05c18 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x494/0x13f0 fs/ocfs2/xattr.c:4024 stack backtrace: CPU: 1 UID: 0 PID: 18272 Comm: syz.3.1181 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219 check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 down_write+0x35/0x50 kernel/locking/rwsem.c:1631 ocfs2_xattr_set+0x4a4/0x13f0 fs/ocfs2/xattr.c:4032 ocfs2_set_acl+0x6fd/0x7b0 fs/ocfs2/acl.c:254 ocfs2_iop_set_acl+0x1b1/0x2b0 fs/ocfs2/acl.c:286 set_posix_acl fs/posix_acl.c:960 [inline] vfs_remove_acl+0x5d8/0x8d0 fs/posix_acl.c:1247 ovl_do_remove_acl fs/overlayfs/overlayfs.h:366 [inline] ovl_workdir_create+0x58e/0x970 fs/overlayfs/super.c:390 ovl_make_workdir fs/overlayfs/super.c:718 [inline] ovl_get_workdir+0x339/0x1980 fs/overlayfs/super.c:876 ovl_fill_super_creds fs/overlayfs/super.c:1488 [inline] ovl_fill_super+0x1771/0x46a0 fs/overlayfs/super.c:1611 get_tree_super fs/super.c:1360 [inline] get_tree_nodev+0xbe/0x150 fs/super.c:1380 vfs_get_tree+0x92/0x2a0 fs/super.c:1881 fc_mount fs/namespace.c:1282 [inline] do_new_mount_fc fs/namespace.c:3910 [inline] do_new_mount+0x325/0xb00 fs/namespace.c:3986 do_mount fs/namespace.c:4350 [inline] __do_sys_mount fs/namespace.c:4565 [inline] __se_sys_mount+0x31d/0x420 fs/namespace.c:4542 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff3e4dafb19 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:00007ff3e2ba1028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff3e5036270 RCX: 00007ff3e4dafb19 RDX: 0000200000000380 RSI: 0000200000000340 RDI: 0000000000000000 RBP: 00007ff3e4e47b70 R08: 00002000000003c0 R09: 0000000000000000 R10: 0000000000200008 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff3e5036308 R14: 00007ff3e5036270 R15: 00007ffd581e91e8 overlayfs: upper fs does not support tmpfile. overlayfs: upper fs does not support RENAME_WHITEOUT. overlayfs: upper fs missing required features.