loop0: detected capacity change from 0 to 1024 EXT4-fs: Ignoring removed orlov option EXT4-fs (loop0): mounted filesystem without journal. Quota mode: none. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.358/5806 is trying to acquire lock: ffff888071349810 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff888071349810 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_create fs/ext4/xattr.c:1462 [inline] ffff888071349810 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}, at: ext4_xattr_inode_lookup_create+0x19b9/0x1e60 fs/ext4/xattr.c:1544 but task is already holding lock: ffff88807134beb8 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x13d4/0x19f0 fs/ext4/inode.c:5612 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+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_update_i_disksize fs/ext4/ext4.h:3396 [inline] ext4_xattr_inode_write fs/ext4/xattr.c:1400 [inline] ext4_xattr_inode_lookup_create+0x162c/0x1e60 fs/ext4/xattr.c:1550 ext4_xattr_ibody_set+0x1fe/0x690 fs/ext4/xattr.c:2209 ext4_xattr_set_handle+0xf7b/0x1570 fs/ext4/xattr.c:2386 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2500 __vfs_setxattr+0x3e0/0x420 fs/xattr.c:182 __vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216 vfs_setxattr+0x167/0x2e0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:655 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1462 [inline] ext4_xattr_inode_lookup_create+0x19b9/0x1e60 fs/ext4/xattr.c:1544 ext4_xattr_block_set+0x23f/0x32b0 fs/ext4/xattr.c:1864 ext4_xattr_move_to_block fs/ext4/xattr.c:2610 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2685 [inline] ext4_expand_extra_isize_ea+0x120b/0x1dc0 fs/ext4/xattr.c:2773 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5984 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6027 [inline] __ext4_mark_inode_dirty+0x47f/0x770 fs/ext4/inode.c:6105 ext4_setattr+0x1457/0x19f0 fs/ext4/inode.c:5615 notify_change+0xc74/0xf40 fs/attr.c:499 do_truncate+0x1ac/0x240 fs/open.c:65 vfs_truncate+0x262/0x2f0 fs/open.c:111 do_sys_truncate+0xf2/0x1c0 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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.0.358/5806: #0: ffff888054d92460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402 #1: ffff88807134c030 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88807134c030 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: do_truncate+0x198/0x240 fs/open.c:63 #2: ffff88807134c1d0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:803 [inline] #2: ffff88807134c1d0 (mapping.invalidate_lock#2){++++}-{3:3}, at: ext4_setattr+0xe6f/0x19f0 fs/ext4/inode.c:5572 #3: ffff88807134beb8 (&ei->i_data_sem/3){++++}-{3:3}, at: ext4_setattr+0x13d4/0x19f0 fs/ext4/inode.c:5612 #4: ffff88807134bcf8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_trylock_xattr fs/ext4/xattr.h:165 [inline] #4: ffff88807134bcf8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_try_to_expand_extra_isize fs/ext4/inode.c:6024 [inline] #4: ffff88807134bcf8 (&ei->xattr_sem){++++}-{3:3}, at: __ext4_mark_inode_dirty+0x3fe/0x770 fs/ext4/inode.c:6105 stack backtrace: CPU: 1 PID: 5806 Comm: syz.0.358 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ext4_xattr_inode_create fs/ext4/xattr.c:1462 [inline] ext4_xattr_inode_lookup_create+0x19b9/0x1e60 fs/ext4/xattr.c:1544 ext4_xattr_block_set+0x23f/0x32b0 fs/ext4/xattr.c:1864 ext4_xattr_move_to_block fs/ext4/xattr.c:2610 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2685 [inline] ext4_expand_extra_isize_ea+0x120b/0x1dc0 fs/ext4/xattr.c:2773 __ext4_expand_extra_isize+0x301/0x3e0 fs/ext4/inode.c:5984 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6027 [inline] __ext4_mark_inode_dirty+0x47f/0x770 fs/ext4/inode.c:6105 ext4_setattr+0x1457/0x19f0 fs/ext4/inode.c:5615 notify_change+0xc74/0xf40 fs/attr.c:499 do_truncate+0x1ac/0x240 fs/open.c:65 vfs_truncate+0x262/0x2f0 fs/open.c:111 do_sys_truncate+0xf2/0x1c0 fs/open.c:134 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f799a59acb9 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:00007f799b4d9028 EFLAGS: 00000246 ORIG_RAX: 000000000000004c RAX: ffffffffffffffda RBX: 00007f799a815fa0 RCX: 00007f799a59acb9 RDX: 0000000000000000 RSI: 0000000000000073 RDI: 0000200000000100 RBP: 00007f799a608bf7 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f799a816038 R14: 00007f799a815fa0 R15: 00007ffeef31b048