------------[ 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: 7155 at kernel/locking/lockdep.c:935 look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932 Modules linked in: CPU: 1 PID: 7155 Comm: syz-executor.4 Not tainted 6.9.0-rc4-syzkaller-g6a71d2909427 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 pstate: 604010c5 (nZCv daIF +PAN -UAO -TCO -DIT +SSBS BTYPE=--) pc : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932 lr : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932 sp : ffff80009e1768e0 x29: ffff80009e1768e0 x28: dfff800000000000 x27: ffff700013c2eda0 x26: ffff8000936a5580 x25: ffff8000936a5000 x24: 0000000000000000 x23: ffff700013c2ed58 x22: 0000000000000000 x21: ffff80008f219df8 x20: ffff0000dfb5c000 x19: ffff8000922d3cb0 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008ae725bc x15: 0000000000000001 x14: 1fffe000367bde02 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000002 x10: 0000000000ff0100 x9 : 95806845256a6700 x8 : 95806845256a6700 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009e176058 x4 : ffff80008ef650a0 x3 : ffff8000805e616c x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932 register_lock_class+0x8c/0x6ac kernel/locking/lockdep.c:1284 __lock_acquire+0x184/0x763c kernel/locking/lockdep.c:5014 lock_acquire+0x248/0x73c kernel/locking/lockdep.c:5754 down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:795 [inline] ext4_xattr_inode_update_ref+0xac/0x4e8 fs/ext4/xattr.c:1042 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1093 [inline] ext4_xattr_set_entry+0x1340/0x33d4 fs/ext4/xattr.c:1729 ext4_xattr_block_set+0x560/0x2b8c fs/ext4/xattr.c:1968 ext4_xattr_set_handle+0xc68/0x12d0 fs/ext4/xattr.c:2443 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2545 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200 __vfs_setxattr_noperm+0x110/0x528 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] setxattr+0x208/0x29c fs/xattr.c:652 path_setxattr+0x17c/0x258 fs/xattr.c:671 __do_sys_setxattr fs/xattr.c:687 [inline] __se_sys_setxattr fs/xattr.c:683 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:683 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 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: 2527 hardirqs last enabled at (2527): [] lookup_bh_lru fs/buffer.c:1385 [inline] hardirqs last enabled at (2527): [] __find_get_block+0x3ac/0xdc4 fs/buffer.c:1397 hardirqs last disabled at (2526): [] lookup_bh_lru fs/buffer.c:1362 [inline] hardirqs last disabled at (2526): [] __find_get_block+0x68/0xdc4 fs/buffer.c:1397 softirqs last enabled at (264): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (264): [] __do_softirq+0xb10/0xd2c kernel/softirq.c:583 softirqs last disabled at (243): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 ---[ end trace 0000000000000000 ]--- ============================================ WARNING: possible recursive locking detected 6.9.0-rc4-syzkaller-g6a71d2909427 #0 Tainted: G W -------------------------------------------- syz-executor.4/7155 is trying to acquire lock: ffff0000dfb5c000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] ffff0000dfb5c000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_xattr_inode_update_ref+0xac/0x4e8 fs/ext4/xattr.c:1042 but task is already holding lock: ffff0000e4db4000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] ffff0000e4db4000 (&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.4/7155: #0: ffff0000ce304420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000e4db4000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:795 [inline] #1: ffff0000e4db4000 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:320 #2: ffff0000e4db3cc8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff0000e4db3cc8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x1dc/0x12d0 fs/ext4/xattr.c:2358 stack backtrace: CPU: 1 PID: 7155 Comm: syz-executor.4 Tainted: G W 6.9.0-rc4-syzkaller-g6a71d2909427 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114 dump_stack+0x1c/0x28 lib/dump_stack.c:123 print_deadlock_bug+0x4e4/0x660 kernel/locking/lockdep.c:3012 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain kernel/locking/lockdep.c:3856 [inline] __lock_acquire+0x5fe4/0x763c kernel/locking/lockdep.c:5137 lock_acquire+0x248/0x73c kernel/locking/lockdep.c:5754 down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:795 [inline] ext4_xattr_inode_update_ref+0xac/0x4e8 fs/ext4/xattr.c:1042 ext4_xattr_inode_dec_ref fs/ext4/xattr.c:1093 [inline] ext4_xattr_set_entry+0x1340/0x33d4 fs/ext4/xattr.c:1729 ext4_xattr_block_set+0x560/0x2b8c fs/ext4/xattr.c:1968 ext4_xattr_set_handle+0xc68/0x12d0 fs/ext4/xattr.c:2443 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2545 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200 __vfs_setxattr_noperm+0x110/0x528 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] setxattr+0x208/0x29c fs/xattr.c:652 path_setxattr+0x17c/0x258 fs/xattr.c:671 __do_sys_setxattr fs/xattr.c:687 [inline] __se_sys_setxattr fs/xattr.c:683 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:683 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 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