R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fc649c16038 R14: 00007fc649c15fa0 R15: 00007ffe6c62e3d8
 </TASK>
============================================
WARNING: possible recursive locking detected
syzkaller #0 Tainted: G             L     
--------------------------------------------
syz.7.1645/12378 is trying to acquire lock:
ffffffff8f3bc7a0 (
fw_lock){+.+.}-{4:4}, at: assign_fw+0x52/0x8d0 drivers/base/firmware_loader/main.c:700

but task is already holding lock:
ffffffff8f3bc7a0 (
fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1504 [inline]
fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1f4/0x2d0 drivers/base/firmware_loader/main.c:1557

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.7.1645/12378:
 #0: ffffffff8f23f380 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350 drivers/char/misc.c:125
 #1: ffffffff8e8067e0 (system_transition_mutex
){+.+.}-{4:4}, at: lock_system_sleep+0x49/0x70 kernel/power/main.c:71
 #2: ffffffff8e82e1c8 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0x65/0x100 kernel/notifier.c:344
 #3: ffffffff8f3bc7a0 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1504 [inline]
 #3: ffffffff8f3bc7a0 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1f4/0x2d0 drivers/base/firmware_loader/main.c:1557
 #4: ffffffff8f3b7620 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:127 [inline]
 #4: ffffffff8f3b7620 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x29/0xb0 drivers/base/power/main.c:2324

stack backtrace:
CPU: 0 UID: 0 PID: 12378 Comm: syz.7.1645 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __mutex_lock_common kernel/locking/mutex.c:632 [inline]
 __mutex_lock+0x19e/0x1420 kernel/locking/mutex.c:794
 assign_fw+0x52/0x8d0 drivers/base/firmware_loader/main.c:700
 _request_firmware+0xfb6/0x1780 drivers/base/firmware_loader/main.c:901
 request_firmware drivers/base/firmware_loader/main.c:948 [inline]
 cache_firmware drivers/base/firmware_loader/main.c:1286 [inline]
 __async_dev_cache_fw_image+0x7f/0x2d0 drivers/base/firmware_loader/main.c:1400
 async_schedule_node_domain+0xe1/0x120 kernel/async.c:221
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x36c/0x3f0 drivers/base/firmware_loader/main.c:1456
 dpm_for_each_dev+0x56/0xb0 drivers/base/power/main.c:2326
 device_cache_fw_images drivers/base/firmware_loader/main.c:1506 [inline]
 fw_pm_notify+0x20c/0x2d0 drivers/base/firmware_loader/main.c:1557
 notifier_call_chain+0x1ad/0x3d0 kernel/notifier.c:85
 notifier_call_chain_robust kernel/notifier.c:120 [inline]
 blocking_notifier_call_chain_robust+0x85/0x100 kernel/notifier.c:345
 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:172
 snapshot_open+0x19c/0x280 kernel/power/user.c:77
 misc_open+0x2d5/0x350 drivers/char/misc.c:163
 chrdev_open+0x4cd/0x5e0 fs/char_dev.c:411
 do_dentry_open+0x785/0x14e0 fs/open.c:947
 vfs_open+0x3b/0x340 fs/open.c:1079
 do_open fs/namei.c:4699 [inline]
 path_openat+0x2e08/0x3860 fs/namei.c:4858
 do_file_open+0x23e/0x4a0 fs/namei.c:4887
 do_sys_openat2+0x113/0x200 fs/open.c:1364
 do_sys_open fs/open.c:1370 [inline]
 __do_sys_openat fs/open.c:1386 [inline]
 __se_sys_openat fs/open.c:1381 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc64999c819
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:00007fc64a87b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc649c15fa0 RCX: 00007fc64999c819
RDX: 0000000000101000 RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007fc64a87b090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fc649c16038 R14: 00007fc649c15fa0 R15: 00007ffe6c62e3d8
 </TASK>