------------[ 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: 9313 at kernel/locking/lockdep.c:935 look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:932 Modules linked in: CPU: 1 PID: 9313 Comm: syz-executor.1 Not tainted 6.10.0-rc7-syzkaller-00109-gc912bf709078 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 pstate: 604000c5 (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 : ffff8000a03d69e0 x29: ffff8000a03d69e0 x28: dfff800000000000 x27: ffff70001407adc0 x26: ffff8000939e9580 x25: ffff8000939e9000 x24: 0000000000000000 x23: ffff70001407ad78 x22: 0000000000000000 x21: ffff80008f49f098 x20: ffff0000dfa03600 x19: ffff800092618480 x18: 0000000000000008 x17: 0000000000000000 x16: ffff800082f8f174 x15: 0000000000000001 x14: 1fffe000367b124a x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000002 x10: 0000000000ff0100 x9 : cd0855ac8f89cb00 x8 : cd0855ac8f89cb00 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000a03d6138 x4 : ffff80008f1e5220 x3 : ffff8000805e111c 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+0x240/0x728 kernel/locking/lockdep.c:5754 down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:791 [inline] ext4_xattr_inode_update_ref+0xac/0x4e8 fs/ext4/xattr.c:1042 ext4_xattr_inode_inc_ref fs/ext4/xattr.c:1088 [inline] ext4_xattr_inode_lookup_create+0x1344/0x1918 fs/ext4/xattr.c:1583 ext4_xattr_block_set+0x224/0x2e08 fs/ext4/xattr.c:1910 ext4_xattr_set_handle+0xc68/0x12d0 fs/ext4/xattr.c:2452 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2554 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] 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:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 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: 3351 hardirqs last enabled at (3351): [] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:234 hardirqs last disabled at (3350): [] kasan_quarantine_put+0x38/0x1c8 mm/kasan/quarantine.c:207 softirqs last enabled at (3294): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (3292): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ============================================ WARNING: possible recursive locking detected 6.10.0-rc7-syzkaller-00109-gc912bf709078 #0 Tainted: G W -------------------------------------------- syz-executor.1/9313 is trying to acquire lock: ffff0000dfa03600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline] ffff0000dfa03600 (&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: ffff0000dbdd3600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline] ffff0000dbdd3600 (&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.1/9313: #0: ffff0000cdcc4420 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409 #1: ffff0000dbdd3600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline] #1: ffff0000dbdd3600 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:320 #2: ffff0000dbdd32c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff0000dbdd32c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x1dc/0x12d0 fs/ext4/xattr.c:2367 stack backtrace: CPU: 1 PID: 9313 Comm: syz-executor.1 Tainted: G W 6.10.0-rc7-syzkaller-00109-gc912bf709078 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 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+0x240/0x728 kernel/locking/lockdep.c:5754 down_write+0x50/0xc0 kernel/locking/rwsem.c:1579 inode_lock include/linux/fs.h:791 [inline] ext4_xattr_inode_update_ref+0xac/0x4e8 fs/ext4/xattr.c:1042 ext4_xattr_inode_inc_ref fs/ext4/xattr.c:1088 [inline] ext4_xattr_inode_lookup_create+0x1344/0x1918 fs/ext4/xattr.c:1583 ext4_xattr_block_set+0x224/0x2e08 fs/ext4/xattr.c:1910 ext4_xattr_set_handle+0xc68/0x12d0 fs/ext4/xattr.c:2452 ext4_xattr_set+0x1e0/0x354 fs/ext4/xattr.c:2554 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] 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:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 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