====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc2-next-20230515-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/1388 is trying to acquire lock: ffff8880309880c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ffff8880309880c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x160/0x1510 fs/ext4/xattr.c:2372 but task is already holding lock: ffff888030988400 (&ea_inode->i_rwsem#8/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] ffff888030988400 (&ea_inode->i_rwsem#8/1){+.+.}-{3:3}, at: vfs_setxattr+0x120/0x340 fs/xattr.c:321 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ea_inode->i_rwsem#8/1){+.+.}-{3:3}: down_write+0x92/0x200 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:775 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1524 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1607 [inline] ext4_xattr_set_entry+0x2b19/0x39e0 fs/ext4/xattr.c:1736 ext4_xattr_block_set+0xcb7/0x3030 fs/ext4/xattr.c:2042 ext4_xattr_set_handle+0xd8a/0x1510 fs/ext4/xattr.c:2457 ext4_xattr_set+0x144/0x360 fs/ext4/xattr.c:2559 __vfs_setxattr+0x173/0x1e0 fs/xattr.c:201 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:235 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:296 vfs_setxattr+0x143/0x340 fs/xattr.c:322 do_setxattr+0x147/0x190 fs/xattr.c:630 setxattr+0x146/0x160 fs/xattr.c:653 path_setxattr+0x197/0x1c0 fs/xattr.c:672 __do_sys_setxattr fs/xattr.c:688 [inline] __se_sys_setxattr fs/xattr.c:684 [inline] __x64_sys_setxattr+0xc4/0x160 fs/xattr.c:684 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&ei->xattr_sem){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5705 down_write+0x92/0x200 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x160/0x1510 fs/ext4/xattr.c:2372 ext4_xattr_set+0x144/0x360 fs/ext4/xattr.c:2559 __vfs_setxattr+0x173/0x1e0 fs/xattr.c:201 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:235 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:296 vfs_setxattr+0x143/0x340 fs/xattr.c:322 do_setxattr+0x147/0x190 fs/xattr.c:630 setxattr+0x146/0x160 fs/xattr.c:653 path_setxattr+0x197/0x1c0 fs/xattr.c:672 __do_sys_lsetxattr fs/xattr.c:695 [inline] __se_sys_lsetxattr fs/xattr.c:691 [inline] __x64_sys_lsetxattr+0xc1/0x160 fs/xattr.c:691 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ea_inode->i_rwsem#8/1); lock(&ei->xattr_sem); lock(&ea_inode->i_rwsem#8/1); lock(&ei->xattr_sem); *** DEADLOCK *** 2 locks held by syz-executor.2/1388: #0: ffff88803ce04460 (sb_writers#4){.+.+}-{0:0}, at: path_setxattr+0xb2/0x1c0 fs/xattr.c:670 #1: ffff888030988400 (&ea_inode->i_rwsem#8/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888030988400 (&ea_inode->i_rwsem#8/1){+.+.}-{3:3}, at: vfs_setxattr+0x120/0x340 fs/xattr.c:321 stack backtrace: CPU: 1 PID: 1388 Comm: syz-executor.2 Not tainted 6.4.0-rc2-next-20230515-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5705 down_write+0x92/0x200 kernel/locking/rwsem.c:1573 ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] ext4_xattr_set_handle+0x160/0x1510 fs/ext4/xattr.c:2372 ext4_xattr_set+0x144/0x360 fs/ext4/xattr.c:2559 __vfs_setxattr+0x173/0x1e0 fs/xattr.c:201 __vfs_setxattr_noperm+0x129/0x5f0 fs/xattr.c:235 __vfs_setxattr_locked+0x1d3/0x260 fs/xattr.c:296 vfs_setxattr+0x143/0x340 fs/xattr.c:322 do_setxattr+0x147/0x190 fs/xattr.c:630 setxattr+0x146/0x160 fs/xattr.c:653 path_setxattr+0x197/0x1c0 fs/xattr.c:672 __do_sys_lsetxattr fs/xattr.c:695 [inline] __se_sys_lsetxattr fs/xattr.c:691 [inline] __x64_sys_lsetxattr+0xc1/0x160 fs/xattr.c:691 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f03af28c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f03aff2c168 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007f03af3ac050 RCX: 00007f03af28c169 RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000020000380 RBP: 00007f03af2e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdad6fcacf R14: 00007f03aff2c300 R15: 0000000000022000