====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/8002 is trying to acquire lock: ffff8880732b16a8 (&sb->s_type->i_mutex_key#11/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline] ffff8880732b16a8 (&sb->s_type->i_mutex_key#11/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1516 [inline] ffff8880732b16a8 (&sb->s_type->i_mutex_key#11/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0x187d/0x1cf0 fs/ext4/xattr.c:1598 but task is already holding lock: ffff88807324e0c0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0xacf/0x1340 fs/ext4/inode.c:4563 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->i_data_sem/3){++++}-{4:4}: down_write+0x96/0x200 kernel/locking/rwsem.c:1625 ext4_update_i_disksize fs/ext4/ext4.h:3482 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1454 [inline] ext4_xattr_inode_lookup_create+0x14f6/0x1cf0 fs/ext4/xattr.c:1604 ext4_xattr_ibody_set+0x202/0x6a0 fs/ext4/xattr.c:2268 ext4_xattr_set_handle+0xcc8/0x14c0 fs/ext4/xattr.c:2445 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559 __vfs_setxattr+0x43c/0x480 fs/xattr.c:218 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252 vfs_setxattr+0x163/0x360 fs/xattr.c:339 do_setxattr fs/xattr.c:654 [inline] filename_setxattr+0x296/0x630 fs/xattr.c:682 path_setxattrat+0x3eb/0x440 fs/xattr.c:726 __do_sys_setxattr fs/xattr.c:760 [inline] __se_sys_setxattr fs/xattr.c:756 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:756 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&sb->s_type->i_mutex_key#11/1){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_write+0x96/0x200 kernel/locking/rwsem.c:1625 inode_lock include/linux/fs.h:1028 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1516 [inline] ext4_xattr_inode_lookup_create+0x187d/0x1cf0 fs/ext4/xattr.c:1598 ext4_xattr_block_set+0x229/0x2ad0 fs/ext4/xattr.c:1918 ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline] ext4_expand_extra_isize_ea+0x12cf/0x1ea0 fs/ext4/xattr.c:2832 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6300 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6343 [inline] __ext4_mark_inode_dirty+0x45c/0x710 fs/ext4/inode.c:6421 ext4_ext_truncate+0xac/0x2f0 fs/ext4/extents.c:4528 ext4_truncate+0xb63/0x1340 fs/ext4/inode.c:4567 ext4_evict_inode+0x863/0xe80 fs/ext4/inode.c:262 evict+0x61e/0xb10 fs/inode.c:846 filename_unlinkat+0x43f/0x610 fs/namei.c:5566 __do_sys_unlink fs/namei.c:5597 [inline] __se_sys_unlink+0x2e/0x140 fs/namei.c:5594 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#11/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#11/1); *** DEADLOCK *** 4 locks held by syz-executor/8002: #0: ffff88807cba6410 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493 #1: ffff88807cba6600 (sb_internal){.+.+}-{0:0}, at: percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] #1: ffff88807cba6600 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs/super.h:19 [inline] #1: ffff88807cba6600 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs/super.h:177 [inline] #1: ffff88807cba6600 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x274/0xe80 fs/ext4/inode.c:216 #2: ffff88807324e0c0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0xacf/0x1340 fs/ext4/inode.c:4563 #3: ffff88807324df20 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:164 [inline] #3: ffff88807324df20 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6340 [inline] #3: ffff88807324df20 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3db/0x710 fs/ext4/inode.c:6421 stack backtrace: CPU: 1 UID: 0 PID: 8002 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_write+0x96/0x200 kernel/locking/rwsem.c:1625 inode_lock include/linux/fs.h:1028 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1516 [inline] ext4_xattr_inode_lookup_create+0x187d/0x1cf0 fs/ext4/xattr.c:1598 ext4_xattr_block_set+0x229/0x2ad0 fs/ext4/xattr.c:1918 ext4_xattr_move_to_block fs/ext4/xattr.c:2669 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2744 [inline] ext4_expand_extra_isize_ea+0x12cf/0x1ea0 fs/ext4/xattr.c:2832 __ext4_expand_extra_isize+0x30d/0x400 fs/ext4/inode.c:6300 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6343 [inline] __ext4_mark_inode_dirty+0x45c/0x710 fs/ext4/inode.c:6421 ext4_ext_truncate+0xac/0x2f0 fs/ext4/extents.c:4528 ext4_truncate+0xb63/0x1340 fs/ext4/inode.c:4567 ext4_evict_inode+0x863/0xe80 fs/ext4/inode.c:262 evict+0x61e/0xb10 fs/inode.c:846 filename_unlinkat+0x43f/0x610 fs/namei.c:5566 __do_sys_unlink fs/namei.c:5597 [inline] __se_sys_unlink+0x2e/0x140 fs/namei.c:5594 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7294399fe7 Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffe7eb03848 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7294399fe7 RDX: 00007ffe7eb03870 RSI: 00007ffe7eb03900 RDI: 00007ffe7eb03900 RBP: 00007ffe7eb03900 R08: 00007ffe7eb04900 R09: 00000000ffffffff R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffe7eb049f0 R13: 00007f729442f33b R14: 000000000002c9f4 R15: 00007ffe7eb06bb0 EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.