============================================
WARNING: possible recursive locking detected
6.16.0-rc2-syzkaller-g52da431bf03b #0 Not tainted
--------------------------------------------
syz.0.16/6650 is trying to acquire lock:
ffff888027d3e378 (&p->frag_sem){.+.+}-{4:4}, at: __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304

but task is already holding lock:
ffff888027d3e378 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline]
ffff888027d3e378 (&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

4 locks held by syz.0.16/6650:
 #0: ffff888146684428 (sb_writers#12){.+.+}-{0:0}, at: ksys_pwrite64 fs/read_write.c:793 [inline]
 #0: ffff888146684428 (sb_writers#12){.+.+}-{0:0}, at: __do_sys_pwrite64 fs/read_write.c:801 [inline]
 #0: ffff888146684428 (sb_writers#12){.+.+}-{0:0}, at: __se_sys_pwrite64 fs/read_write.c:798 [inline]
 #0: ffff888146684428 (sb_writers#12){.+.+}-{0:0}, at: __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798
 #1: ffff88807e999688 (&buffer->mutex){+.+.}-{4:4}, at: configfs_write_iter+0x75/0x4e0 fs/configfs/file.c:226
 #2: ffff888027d3e378 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline]
 #2: ffff888027d3e378 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x219/0x4e0 fs/configfs/file.c:229
 #3: ffffffff8f6782e8 (target_devices_lock){+.+.}-{4:4}, at: target_core_item_dbroot_store+0x21/0x350 drivers/target/target_core_configfs.c:114

stack backtrace:
CPU: 0 UID: 0 PID: 6650 Comm: syz.0.16 Not tainted 6.16.0-rc2-syzkaller-g52da431bf03b #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3044
 check_deadlock kernel/locking/lockdep.c:3096 [inline]
 validate_chain kernel/locking/lockdep.c:3898 [inline]
 __lock_acquire+0x1106/0x1c90 kernel/locking/lockdep.c:5240
 lock_acquire kernel/locking/lockdep.c:5871 [inline]
 lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
 down_read+0x9b/0x480 kernel/locking/rwsem.c:1524
 __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304
 do_dentry_open+0x744/0x1c10 fs/open.c:964
 vfs_open+0x82/0x3f0 fs/open.c:1094
 do_open fs/namei.c:3896 [inline]
 path_openat+0x1de4/0x2cb0 fs/namei.c:4055
 do_filp_open+0x20b/0x470 fs/namei.c:4082
 file_open_name+0x2a3/0x450 fs/open.c:1381
 filp_open+0x4b/0x80 fs/open.c:1401
 target_core_item_dbroot_store+0x108/0x350 drivers/target/target_core_configfs.c:134
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x303/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x6c7/0x1150 fs/read_write.c:686
 ksys_pwrite64 fs/read_write.c:793 [inline]
 __do_sys_pwrite64 fs/read_write.c:801 [inline]
 __se_sys_pwrite64 fs/read_write.c:798 [inline]
 __x64_sys_pwrite64+0x1eb/0x250 fs/read_write.c:798
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe0c9785d29
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:00007fe0ca4d0038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007fe0c9975fa0 RCX: 00007fe0c9785d29
RDX: 0000000000000200 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00007fe0c9801b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000009 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe0c9975fa0 R15: 00007ffcdeb5dce8
 </TASK>
db_root: not a directory: /sys/kernel/config/target/dbroot