------------[ cut here ]------------ Looking for class "&ea_inode->i_rwsem" with key ext4_fs_type, but found a different class "&sb->s_type->i_mutex_key" with the same key WARNING: CPU: 1 PID: 12017 at kernel/locking/lockdep.c:934 look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:931 Modules linked in: CPU: 1 UID: 0 PID: 12017 Comm: syz-executor.3 Not tainted 6.11.0-rc7-syzkaller-00105-g5f5673607153 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:931 lr : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:931 sp : ffff8000a10c6d00 x29: ffff8000a10c6d00 x28: dfff800000000000 x27: 0000000000000000 x26: ffff800097041700 x25: ffff800097041000 x24: 0000000000000000 x23: 0000000000000000 x22: 1ffff00011eae0b1 x21: ffff80008f919dd8 x20: ffff0000dcae35d0 x19: ffff800092b4e028 x18: 0000000000000008 x17: 0000000000000000 x16: ffff800083032784 x15: 0000000000000001 x14: 1fffe000366d7a5a x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000002 x10: 0000000000ff0100 x9 : 2a70d36269b16000 x8 : 2a70d36269b16000 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000a10c6458 x4 : ffff80008f65b620 x3 : ffff8000806051a0 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:931 register_lock_class+0x8c/0x6ac kernel/locking/lockdep.c:1283 __lock_acquire+0x18c/0x779c kernel/locking/lockdep.c:5019 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759 down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:800 [inline] ext4_xattr_inode_iget+0x360/0x510 fs/ext4/xattr.c:461 ext4_xattr_set_entry+0x7cc/0x1694 fs/ext4/xattr.c:1712 ext4_xattr_ibody_set+0x204/0x604 fs/ext4/xattr.c:2274 ext4_xattr_set_handle+0xb64/0x12d0 fs/ext4/xattr.c:2446 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2560 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200 __vfs_setxattr_noperm+0x110/0x578 fs/xattr.c:234 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295 vfs_setxattr+0x1a8/0x344 fs/xattr.c:321 do_setxattr fs/xattr.c:629 [inline] path_setxattr+0x30c/0x428 fs/xattr.c:658 __do_sys_setxattr fs/xattr.c:676 [inline] __se_sys_setxattr fs/xattr.c:672 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:672 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 5977 hardirqs last enabled at (5977): [] lookup_bh_lru fs/buffer.c:1392 [inline] hardirqs last enabled at (5977): [] __find_get_block+0x3a4/0xd84 fs/buffer.c:1404 hardirqs last disabled at (5976): [] lookup_bh_lru fs/buffer.c:1369 [inline] hardirqs last disabled at (5976): [] __find_get_block+0x64/0xd84 fs/buffer.c:1404 softirqs last enabled at (5202): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (5200): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ============================================ WARNING: possible recursive locking detected 6.11.0-rc7-syzkaller-00105-g5f5673607153 #0 Tainted: G W -------------------------------------------- syz-executor.3/12017 is trying to acquire lock: ffff0000dcae35d0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline] ffff0000dcae35d0 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_xattr_inode_iget+0x360/0x510 fs/ext4/xattr.c:461 but task is already holding lock: ffff0000dcae53b8 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline] ffff0000dcae53b8 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:320 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sb->s_type->i_mutex_key#8); lock(&sb->s_type->i_mutex_key#8); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syz-executor.3/12017: #0: ffff0000c6f88420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:515 #1: ffff0000dcae53b8 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:800 [inline] #1: ffff0000dcae53b8 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:320 #2: ffff0000dcae5088 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff0000dcae5088 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x1dc/0x12d0 fs/ext4/xattr.c:2373 stack backtrace: CPU: 1 UID: 0 PID: 12017 Comm: syz-executor.3 Tainted: G W 6.11.0-rc7-syzkaller-00105-g5f5673607153 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:319 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:326 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:119 dump_stack+0x1c/0x28 lib/dump_stack.c:128 print_deadlock_bug+0x4e4/0x660 kernel/locking/lockdep.c:3011 check_deadlock kernel/locking/lockdep.c:3061 [inline] validate_chain kernel/locking/lockdep.c:3855 [inline] __lock_acquire+0x6160/0x779c kernel/locking/lockdep.c:5142 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759 down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:800 [inline] ext4_xattr_inode_iget+0x360/0x510 fs/ext4/xattr.c:461 ext4_xattr_set_entry+0x7cc/0x1694 fs/ext4/xattr.c:1712 ext4_xattr_ibody_set+0x204/0x604 fs/ext4/xattr.c:2274 ext4_xattr_set_handle+0xb64/0x12d0 fs/ext4/xattr.c:2446 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2560 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200 __vfs_setxattr_noperm+0x110/0x578 fs/xattr.c:234 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:295 vfs_setxattr+0x1a8/0x344 fs/xattr.c:321 do_setxattr fs/xattr.c:629 [inline] path_setxattr+0x30c/0x428 fs/xattr.c:658 __do_sys_setxattr fs/xattr.c:676 [inline] __se_sys_setxattr fs/xattr.c:672 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:672 __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+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598