============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G     U       L     
--------------------------------------------
syz.3.2927/19177 is trying to acquire lock:
ffff888027bb4278 (&p->frag_sem){.+.+}-{4:4}, at: __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304

but task is already holding lock:
ffff888027bb4278 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline]
ffff888027bb4278 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x219/0x4e0 fs/configfs/file.c:229

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&p->frag_sem);
  lock(&p->frag_sem);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by syz.3.2927/19177:
 #0: ffff88802930a9b8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x2a2/0x370 fs/file.c:1255
 #1: ffff88801d394420 (sb_writers#19){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:738
 #2: ffff88803290fc88 (&buffer->mutex#2){+.+.}-{4:4}, at: configfs_write_iter+0x75/0x4e0 fs/configfs/file.c:226
 #3: ffff888027bb4278 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline]
 #3: ffff888027bb4278 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x219/0x4e0 fs/configfs/file.c:229
 #4: ffffffff8f43d668 (target_devices_lock){+.+.}-{4:4}, at: target_core_item_dbroot_store+0x21/0x370 drivers/target/target_core_configfs.c:114

stack backtrace:
CPU: 1 UID: 0 PID: 19177 Comm: syz.3.2927 Tainted: G     U       L      syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_deadlock_bug+0x225/0x2f0 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x1497/0x2890 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
 down_read+0x9b/0x460 kernel/locking/rwsem.c:1537
 __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304
 do_dentry_open+0x748/0x1590 fs/open.c:962
 vfs_open+0x82/0x3f0 fs/open.c:1094
 do_open fs/namei.c:4628 [inline]
 path_openat+0x2078/0x3140 fs/namei.c:4787
 do_filp_open+0x20b/0x470 fs/namei.c:4814
 file_open_name+0x2a3/0x450 fs/open.c:1376
 filp_open+0x4b/0x80 fs/open.c:1396
 target_core_item_dbroot_store+0x108/0x370 drivers/target/target_core_configfs.c:134
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x306/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x7d3/0x11d0 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f953458f7c9
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:00007f95327cd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f95347e6090 RCX: 00007f953458f7c9
RDX: 0000000000000100 RSI: 0000200000000240 RDI: 0000000000000004
RBP: 00007f9534613f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f95347e6128 R14: 00007f95347e6090 R15: 00007ffcf4a1ec88
 </TASK>
db_root: not a directory: /sys/kernel/config/target/dbroot