R10: 000000000000fffe R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f503c1a5fa0 R15: 00007ffd5eac3fc8
 </TASK>
============================================
WARNING: possible recursive locking detected
6.13.0-syzkaller-09760-g69e858e0b8b2 #0 Not tainted
--------------------------------------------
syz.0.647/8040 is trying to acquire lock:
ffffffff8f0ca328 (fw_lock){+.+.}-{4:4}, at: assign_fw+0x4e/0x600 drivers/base/firmware_loader/main.c:700

but task is already holding lock:
ffffffff8f0ca328 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline]
ffffffff8f0ca328 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x69/0x150 drivers/base/firmware_loader/main.c:1601

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

       CPU0
       ----
  lock(fw_lock);
  lock(fw_lock);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

5 locks held by syz.0.647/8040:
 #0: ffffffff8eec0d08 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x420 drivers/char/misc.c:143
 #1: ffffffff8e082808 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x87/0xa0 kernel/power/main.c:56
 #2: ffffffff8e0c0990 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust kernel/notifier.c:344 [inline]
 #2: ffffffff8e0c0990 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0xa9/0x170 kernel/notifier.c:333
 #3: ffffffff8f0ca328 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline]
 #3: ffffffff8f0ca328 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x69/0x150 drivers/base/firmware_loader/main.c:1601
 #4: ffffffff8f0c4f48 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:113 [inline]
 #4: ffffffff8f0c4f48 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev drivers/base/power/main.c:1986 [inline]
 #4: ffffffff8f0c4f48 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2d/0xb0 drivers/base/power/main.c:1979

stack backtrace:
CPU: 2 UID: 0 PID: 8040 Comm: syz.0.647 Not tainted 6.13.0-syzkaller-09760-g69e858e0b8b2 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_deadlock_bug+0x2e3/0x410 kernel/locking/lockdep.c:3039
 check_deadlock kernel/locking/lockdep.c:3091 [inline]
 validate_chain kernel/locking/lockdep.c:3893 [inline]
 __lock_acquire+0x2117/0x3c40 kernel/locking/lockdep.c:5228
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x19b/0xb10 kernel/locking/mutex.c:730
 assign_fw+0x4e/0x600 drivers/base/firmware_loader/main.c:700
 _request_firmware+0x983/0x1470 drivers/base/firmware_loader/main.c:944
 request_firmware drivers/base/firmware_loader/main.c:992 [inline]
 cache_firmware drivers/base/firmware_loader/main.c:1330 [inline]
 __async_dev_cache_fw_image+0xb2/0x340 drivers/base/firmware_loader/main.c:1444
 async_schedule_node_domain+0xd1/0x120 kernel/async.c:221
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x38f/0x490 drivers/base/firmware_loader/main.c:1500
 dpm_for_each_dev drivers/base/power/main.c:1988 [inline]
 dpm_for_each_dev+0x5a/0xb0 drivers/base/power/main.c:1979
 device_cache_fw_images drivers/base/firmware_loader/main.c:1550 [inline]
 fw_pm_notify+0x81/0x150 drivers/base/firmware_loader/main.c:1601
 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85
 notifier_call_chain_robust kernel/notifier.c:120 [inline]
 blocking_notifier_call_chain_robust kernel/notifier.c:345 [inline]
 blocking_notifier_call_chain_robust+0xc9/0x170 kernel/notifier.c:333
 pm_notifier_call_chain_robust+0x27/0x60 kernel/power/main.c:102
 snapshot_open+0x189/0x2b0 kernel/power/user.c:77
 misc_open+0x35a/0x420 drivers/char/misc.c:179
 chrdev_open+0x237/0x6a0 fs/char_dev.c:414
 do_dentry_open+0x735/0x1c40 fs/open.c:955
 vfs_open+0x82/0x3f0 fs/open.c:1085
 do_open fs/namei.c:3830 [inline]
 path_openat+0x1e88/0x2d80 fs/namei.c:3989
 do_filp_open+0x20c/0x470 fs/namei.c:4016
 do_sys_openat2+0x17a/0x1e0 fs/open.c:1427
 do_sys_open fs/open.c:1442 [inline]
 __do_sys_openat fs/open.c:1458 [inline]
 __se_sys_openat fs/open.c:1453 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1453
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f503bf8cda9
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:00007f503cd29038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f503c1a5fa0 RCX: 00007f503bf8cda9
RDX: 0000000000000000 RSI: 0000000020000340 RDI: ffffffffffffff9c
RBP: 00007f503cd29090 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fffe R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f503c1a5fa0 R15: 00007ffd5eac3fc8
 </TASK>