====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc7-syzkaller #0 Not tainted ------------------------------------------------------ syz.9.81/7805 is trying to acquire lock: ffff88805b9597c8 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] ffff88805b9597c8 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1514 [inline] ffff88805b9597c8 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0x17bb/0x1c50 fs/ext4/xattr.c:1596 but task is already holding lock: ffff88805bad47e0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x994/0x11a0 fs/ext4/inode.c:4212 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+0x99/0x220 kernel/locking/rwsem.c:1577 ext4_update_i_disksize fs/ext4/ext4.h:3375 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1452 [inline] ext4_xattr_inode_lookup_create+0x1464/0x1c50 fs/ext4/xattr.c:1602 ext4_xattr_ibody_set+0x214/0x730 fs/ext4/xattr.c:2269 ext4_xattr_set_handle+0xcef/0x1770 fs/ext4/xattr.c:2446 ext4_xattr_set+0x280/0x3e0 fs/ext4/xattr.c:2560 __vfs_setxattr+0x468/0x4a0 fs/xattr.c:200 __vfs_setxattr_noperm+0x12e/0x660 fs/xattr.c:234 vfs_setxattr+0x221/0x430 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x2af/0x430 fs/xattr.c:665 path_setxattrat+0x440/0x510 fs/xattr.c:713 __do_sys_setxattr fs/xattr.c:747 [inline] __se_sys_setxattr fs/xattr.c:743 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:743 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e -> #0 (&sb->s_type->i_mutex_key#8/1){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x3016/0x81c0 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x540 kernel/locking/lockdep.c:5851 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:877 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1514 [inline] ext4_xattr_inode_lookup_create+0x17bb/0x1c50 fs/ext4/xattr.c:1596 ext4_xattr_block_set+0x272/0x3160 fs/ext4/xattr.c:1916 ext4_xattr_move_to_block fs/ext4/xattr.c:2670 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2745 [inline] ext4_expand_extra_isize_ea+0x12d7/0x1cf0 fs/ext4/xattr.c:2837 __ext4_expand_extra_isize+0x2fb/0x3e0 fs/ext4/inode.c:5889 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5932 [inline] __ext4_mark_inode_dirty+0x54e/0x890 fs/ext4/inode.c:6010 ext4_ext_truncate+0x9f/0x2b0 fs/ext4/extents.c:4457 ext4_truncate+0xa1b/0x11a0 fs/ext4/inode.c:4217 ext4_evict_inode+0x90f/0xf50 fs/ext4/inode.c:263 evict+0x4e8/0x9a0 fs/inode.c:796 __dentry_kill+0x200/0x610 fs/dcache.c:643 dput+0x19f/0x2b0 fs/dcache.c:885 do_renameat2+0xda1/0x13f0 fs/namei.c:5228 __do_sys_rename fs/namei.c:5273 [inline] __se_sys_rename fs/namei.c:5271 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5271 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e 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#8/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#8/1); *** DEADLOCK *** 7 locks held by syz.9.81/7805: #0: ffff888032052420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:547 #1: ffff888032052730 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3221 [inline] #1: ffff888032052730 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x5cf/0x13f0 fs/namei.c:5161 #2: ffff88806d8fe708 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline] #2: ffff88806d8fe708 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x145/0x220 fs/namei.c:3187 #3: ffff88805bad3f68 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline] #3: ffff88805bad3f68 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16f/0x220 fs/namei.c:3188 #4: ffff888032052610 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1785 [inline] #4: ffff888032052610 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1968 [inline] #4: ffff888032052610 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:217 #5: ffff88805bad47e0 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x994/0x11a0 fs/ext4/inode.c:4212 #6: ffff88805bad4620 (&ei->xattr_sem){++++}-{4:4}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:161 [inline] #6: ffff88805bad4620 (&ei->xattr_sem){++++}-{4:4}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5929 [inline] #6: ffff88805bad4620 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x4b5/0x890 fs/ext4/inode.c:6010 stack backtrace: CPU: 1 UID: 0 PID: 7805 Comm: syz.9.81 Not tainted 6.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076 check_noncircular+0x379/0x4b0 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x3016/0x81c0 kernel/locking/lockdep.c:5228 lock_acquire+0x1ed/0x540 kernel/locking/lockdep.c:5851 down_write+0x99/0x220 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:877 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1514 [inline] ext4_xattr_inode_lookup_create+0x17bb/0x1c50 fs/ext4/xattr.c:1596 ext4_xattr_block_set+0x272/0x3160 fs/ext4/xattr.c:1916 ext4_xattr_move_to_block fs/ext4/xattr.c:2670 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2745 [inline] ext4_expand_extra_isize_ea+0x12d7/0x1cf0 fs/ext4/xattr.c:2837 __ext4_expand_extra_isize+0x2fb/0x3e0 fs/ext4/inode.c:5889 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5932 [inline] __ext4_mark_inode_dirty+0x54e/0x890 fs/ext4/inode.c:6010 ext4_ext_truncate+0x9f/0x2b0 fs/ext4/extents.c:4457 ext4_truncate+0xa1b/0x11a0 fs/ext4/inode.c:4217 ext4_evict_inode+0x90f/0xf50 fs/ext4/inode.c:263 evict+0x4e8/0x9a0 fs/inode.c:796 __dentry_kill+0x200/0x610 fs/dcache.c:643 dput+0x19f/0x2b0 fs/dcache.c:885 do_renameat2+0xda1/0x13f0 fs/namei.c:5228 __do_sys_rename fs/namei.c:5273 [inline] __se_sys_rename fs/namei.c:5271 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5271 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fdfaf58cde9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdfb043b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007fdfaf7a6080 RCX: 00007fdfaf58cde9 RDX: 0000000000000000 RSI: 00004000000000c0 RDI: 0000400000000000 RBP: 00007fdfaf60e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fdfaf7a6080 R15: 00007ffdec35d038