netlink: 12 bytes leftover after parsing attributes in process `syz.7.1342'.
bond0: option ad_select: unable to set because the bond device is up
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.1342/13074 is trying to acquire lock:
ffff888033b49700 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}, at: ext4_xattr_inode_lookup_create+0x17d4/0x1c20

but task is already holding lock:
ffff888114510c00 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x93f/0x1100

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ei->i_data_sem/3){++++}-{4:4}:
       lock_acquire+0x120/0x360
       down_write+0x96/0x1f0
       ext4_xattr_inode_lookup_create+0x14d1/0x1c20
       ext4_xattr_ibody_set+0x202/0x6a0
       ext4_xattr_set_handle+0xc9a/0x1590
       ext4_xattr_set+0x230/0x320
       __vfs_setxattr+0x43c/0x480
       __vfs_setxattr_noperm+0x12d/0x660
       vfs_setxattr+0x16b/0x2f0
       filename_setxattr+0x274/0x600
       path_setxattrat+0x364/0x3a0
       __x64_sys_setxattr+0xbc/0xe0
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&sb->s_type->i_mutex_key#9/1){+.+.}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       down_write+0x96/0x1f0
       ext4_xattr_inode_lookup_create+0x17d4/0x1c20
       ext4_xattr_block_set+0x223/0x2ac0
       ext4_expand_extra_isize_ea+0x12d5/0x1ea0
       __ext4_expand_extra_isize+0x30d/0x400
       __ext4_mark_inode_dirty+0x46c/0x700
       ext4_ext_truncate+0xac/0x300
       ext4_truncate+0x9c0/0x1100
       ext4_evict_inode+0x8cf/0xee0
       evict+0x504/0x9c0
       do_unlinkat+0x39f/0x560
       __x64_sys_unlink+0x47/0x50
       do_syscall_64+0xfa/0x3b0
       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#9/1);
                               lock(&ei->i_data_sem/3);
  lock(&sb->s_type->i_mutex_key#9/1);

 *** DEADLOCK ***

4 locks held by syz.7.1342/13074:
 #0: ffff888121e5a428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff888121e5a618 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x2d6/0xee0
 #2: ffff888114510c00 (&ei->i_data_sem/3){++++}-{4:4}, at: ext4_truncate+0x93f/0x1100
 #3: ffff888114510a58 (&ei->xattr_sem){++++}-{4:4}, at: __ext4_mark_inode_dirty+0x3eb/0x700

stack backtrace:
CPU: 0 UID: 0 PID: 13074 Comm: syz.7.1342 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 down_write+0x96/0x1f0
 ext4_xattr_inode_lookup_create+0x17d4/0x1c20
 ext4_xattr_block_set+0x223/0x2ac0
 ext4_expand_extra_isize_ea+0x12d5/0x1ea0
 __ext4_expand_extra_isize+0x30d/0x400
 __ext4_mark_inode_dirty+0x46c/0x700
 ext4_ext_truncate+0xac/0x300
 ext4_truncate+0x9c0/0x1100
 ext4_evict_inode+0x8cf/0xee0
 evict+0x504/0x9c0
 do_unlinkat+0x39f/0x560
 __x64_sys_unlink+0x47/0x50
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4a68b8ebe9
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:00007f4a69a38038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f4a68db5fa0 RCX: 00007f4a68b8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000080
RBP: 00007f4a68c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4a68db6038 R14: 00007f4a68db5fa0 R15: 00007ffe5bbec748
 </TASK>
