EXT4-fs (loop0): 1 truncate cleaned up EXT4-fs (loop0): mounted filesystem without journal. Opts: max_batch_time=0x0000000000000004,jqfmt=vfsold,debug_want_extra_isize=0x000000000000006a,user_xattr,discard,nombcache,,errors=continue. Quota mode: none. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.55/5218 is trying to acquire lock: ffff888070ee53b0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] ffff888070ee53b0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1465 [inline] ffff888070ee53b0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1547 [inline] ffff888070ee53b0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_set_entry+0x3729/0x3f70 fs/ext4/xattr.c:1675 but task is already holding lock: ffff888070ee5c30 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x149b/0x1b70 fs/ext4/inode.c:5583 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ei->i_data_sem/3){++++}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ext4_update_i_disksize fs/ext4/ext4.h:3425 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1403 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1551 [inline] ext4_xattr_set_entry+0x34ba/0x3f70 fs/ext4/xattr.c:1675 ext4_xattr_ibody_set+0x113/0x330 fs/ext4/xattr.c:2240 ext4_xattr_set_handle+0xa68/0x12b0 fs/ext4/xattr.c:2397 ext4_xattr_set+0x22e/0x310 fs/ext4/xattr.c:2510 __vfs_setxattr+0x3d8/0x410 fs/xattr.c:182 __vfs_setxattr_noperm+0x126/0x5e0 fs/xattr.c:216 vfs_setxattr+0x167/0x2e0 fs/xattr.c:303 do_setxattr fs/xattr.c:588 [inline] setxattr+0x2cb/0x360 fs/xattr.c:611 path_setxattr+0x147/0x290 fs/xattr.c:630 __do_sys_lsetxattr fs/xattr.c:653 [inline] __se_sys_lsetxattr fs/xattr.c:649 [inline] __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:649 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:787 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1465 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1547 [inline] ext4_xattr_set_entry+0x3729/0x3f70 fs/ext4/xattr.c:1675 ext4_xattr_block_set+0x4d7/0x2ce0 fs/ext4/xattr.c:1926 ext4_xattr_move_to_block fs/ext4/xattr.c:2620 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2695 [inline] ext4_expand_extra_isize_ea+0xebe/0x18e0 fs/ext4/xattr.c:2783 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5924 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5967 [inline] __ext4_mark_inode_dirty+0x444/0x6c0 fs/ext4/inode.c:6045 ext4_setattr+0x151a/0x1b70 fs/ext4/inode.c:5586 notify_change+0xbc6/0xee0 fs/attr.c:505 do_truncate+0x1ac/0x240 fs/open.c:65 handle_truncate fs/namei.c:3273 [inline] do_open fs/namei.c:3620 [inline] path_openat+0x293b/0x2fb0 fs/namei.c:3750 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_open fs/open.c:1279 [inline] __se_sys_open fs/open.c:1275 [inline] __x64_sys_open+0x11b/0x140 fs/open.c:1275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 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#9/1); lock(&ei->i_data_sem/3); lock(&sb->s_type->i_mutex_key#9/1); *** DEADLOCK *** 5 locks held by syz.0.55/5218: #0: ffff8880199f6460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:386 #1: ffff888070ee5da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff888070ee5da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: do_truncate+0x198/0x240 fs/open.c:63 #2: ffff888070ee5f48 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline] #2: ffff888070ee5f48 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xf40/0x1b70 fs/ext4/inode.c:5543 #3: ffff888070ee5c30 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x149b/0x1b70 fs/ext4/inode.c:5583 #4: ffff888070ee5a80 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #4: ffff888070ee5a80 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:5964 [inline] #4: ffff888070ee5a80 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3bd/0x6c0 fs/ext4/inode.c:6045 stack backtrace: CPU: 0 PID: 5218 Comm: syz.0.55 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 down_write+0x38/0x60 kernel/locking/rwsem.c:1551 inode_lock include/linux/fs.h:787 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1465 [inline] ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1547 [inline] ext4_xattr_set_entry+0x3729/0x3f70 fs/ext4/xattr.c:1675 ext4_xattr_block_set+0x4d7/0x2ce0 fs/ext4/xattr.c:1926 ext4_xattr_move_to_block fs/ext4/xattr.c:2620 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2695 [inline] ext4_expand_extra_isize_ea+0xebe/0x18e0 fs/ext4/xattr.c:2783 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5924 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5967 [inline] __ext4_mark_inode_dirty+0x444/0x6c0 fs/ext4/inode.c:6045 ext4_setattr+0x151a/0x1b70 fs/ext4/inode.c:5586 notify_change+0xbc6/0xee0 fs/attr.c:505 do_truncate+0x1ac/0x240 fs/open.c:65 handle_truncate fs/namei.c:3273 [inline] do_open fs/namei.c:3620 [inline] path_openat+0x293b/0x2fb0 fs/namei.c:3750 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_open fs/open.c:1279 [inline] __se_sys_open fs/open.c:1275 [inline] __x64_sys_open+0x11b/0x140 fs/open.c:1275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f2792abfdd9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2792121028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f2792d38fa0 RCX: 00007f2792abfdd9 RDX: 0000000000000020 RSI: 000000000004827e RDI: 0000200000000200 RBP: 00007f2792b55d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2792d39038 R14: 00007f2792d38fa0 R15: 00007fffa8587e48