------------[ 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: 13299 at kernel/locking/lockdep.c:941 look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:938 Modules linked in: CPU: 1 PID: 13299 Comm: syz-executor369 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:938 lr : look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:938 sp : ffff800022556920 x29: ffff800022556920 x28: dfff800000000000 x27: ffff800008f50df0 x26: ffff80001a0a7600 x25: ffff80001a0a7000 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000000 x21: ffff8000160dae58 x20: ffff0000e6c5de48 x19: ffff800018ce3500 x18: 1ffff000044aad7c x17: 0000000000000000 x16: ffff80001236e294 x15: 0000000000000002 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : 7a6e2744c5c8a300 x8 : 7a6e2744c5c8a300 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800022556218 x4 : ffff800015e4ccc0 x3 : ffff800008584230 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: look_up_lock_class+0xec/0x158 kernel/locking/lockdep.c:938 register_lock_class+0x8c/0x6a4 kernel/locking/lockdep.c:1290 __lock_acquire+0x184/0x764c kernel/locking/lockdep.c:4935 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 down_write+0x50/0xc0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ext4_xattr_inode_update_ref+0xac/0x4e0 fs/ext4/xattr.c:1059 ext4_xattr_inode_inc_ref fs/ext4/xattr.c:1105 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1597 [inline] ext4_xattr_set_entry+0x243c/0x2c3c fs/ext4/xattr.c:1737 ext4_xattr_block_set+0x8e0/0x2cc4 fs/ext4/xattr.c:2043 ext4_xattr_set_handle+0xb2c/0x12d8 fs/ext4/xattr.c:2458 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:203 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:237 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:298 vfs_setxattr+0x1a8/0x344 fs/xattr.c:324 do_setxattr fs/xattr.c:609 [inline] setxattr+0x208/0x29c fs/xattr.c:632 path_setxattr+0x17c/0x258 fs/xattr.c:651 __do_sys_setxattr fs/xattr.c:667 [inline] __se_sys_setxattr fs/xattr.c:663 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:663 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 irq event stamp: 287 hardirqs last enabled at (287): [] kasan_quarantine_put+0x1a0/0x1c8 mm/kasan/quarantine.c:242 hardirqs last disabled at (286): [] kasan_quarantine_put+0x38/0x1c8 mm/kasan/quarantine.c:215 softirqs last enabled at (210): [] softirq_handle_end kernel/softirq.c:414 [inline] softirqs last enabled at (210): [] __do_softirq+0xac0/0xd54 kernel/softirq.c:600 softirqs last disabled at (197): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]--- ============================================ WARNING: possible recursive locking detected 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Tainted: G W -------------------------------------------- syz-executor369/13299 is trying to acquire lock: ffff0000e6c5de48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff0000e6c5de48 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_xattr_inode_update_ref+0xac/0x4e0 fs/ext4/xattr.c:1059 but task is already holding lock: ffff0000e6d00400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff0000e6d00400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:323 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-executor369/13299: #0: ffff0000d7938460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:394 #1: ffff0000e6d00400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000e6d00400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: vfs_setxattr+0x17c/0x344 fs/xattr.c:323 #2: ffff0000e6d000c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline] #2: ffff0000e6d000c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_xattr_set_handle+0x1e0/0x12d8 fs/ext4/xattr.c:2373 stack backtrace: CPU: 1 PID: 13299 Comm: syz-executor369 Tainted: G W 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 dump_stack+0x1c/0x28 lib/dump_stack.c:113 __lock_acquire+0x6310/0x764c kernel/locking/lockdep.c:5056 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669 down_write+0x50/0xc0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ext4_xattr_inode_update_ref+0xac/0x4e0 fs/ext4/xattr.c:1059 ext4_xattr_inode_inc_ref fs/ext4/xattr.c:1105 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1597 [inline] ext4_xattr_set_entry+0x243c/0x2c3c fs/ext4/xattr.c:1737 ext4_xattr_block_set+0x8e0/0x2cc4 fs/ext4/xattr.c:2043 ext4_xattr_set_handle+0xb2c/0x12d8 fs/ext4/xattr.c:2458 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:203 __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:237 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:298 vfs_setxattr+0x1a8/0x344 fs/xattr.c:324 do_setxattr fs/xattr.c:609 [inline] setxattr+0x208/0x29c fs/xattr.c:632 path_setxattr+0x17c/0x258 fs/xattr.c:651 __do_sys_setxattr fs/xattr.c:667 [inline] __se_sys_setxattr fs/xattr.c:663 [inline] __arm64_sys_setxattr+0xbc/0xd8 fs/xattr.c:663 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591