random: crng reseeded on system resumption
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5317 Comm: syz.0.0 Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full) 
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_lvl+0x189/0x250 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x414/0x560 lib/fault-inject.c:174
 should_failslab+0xa8/0x100 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4100 [inline]
 slab_alloc_node mm/slub.c:4176 [inline]
 __kmalloc_cache_noprof+0x70/0x3d0 mm/slub.c:4353
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 async_schedule_node_domain+0x5b/0x120 kernel/async.c:208
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x364/0x3e0 drivers/base/firmware_loader/main.c:1474
 dpm_for_each_dev+0x56/0xb0 drivers/base/power/main.c:2215
 device_cache_fw_images drivers/base/firmware_loader/main.c:1524 [inline]
 fw_pm_notify+0x200/0x2a0 drivers/base/firmware_loader/main.c:1575
 notifier_call_chain+0x1b6/0x3e0 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:102
 snapshot_open+0x133/0x280 kernel/power/user.c:87
 misc_open+0x2bc/0x330 drivers/char/misc.c:179
 chrdev_open+0x4cc/0x5e0 fs/char_dev.c:414
 do_dentry_open+0xdf0/0x1970 fs/open.c:964
 vfs_open+0x3b/0x340 fs/open.c:1094
 do_open fs/namei.c:3887 [inline]
 path_openat+0x2ee5/0x3830 fs/namei.c:4046
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcedc78e969
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:00007fcedd690038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fcedc9b5fa0 RCX: 00007fcedc78e969
RDX: 0000000000042801 RSI: 00002000000002c0 RDI: ffffffffffffff9c
RBP: 00007fcedd690090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fcedc9b5fa0 R15: 00007ffcc772b5c8
 </TASK>
============================================
WARNING: possible recursive locking detected
6.15.0-syzkaller-10820-gcd2e103d57e5 #0 Not tainted
--------------------------------------------
syz.0.0/5317 is trying to acquire lock:
ffffffff8eb149e8 (fw_lock){+.+.}-{4:4}, at: assign_fw+0x52/0x890 drivers/base/firmware_loader/main.c:700

but task is already holding lock:
ffffffff8eb149e8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1522 [inline]
ffffffff8eb149e8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1e8/0x2a0 drivers/base/firmware_loader/main.c:1575

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.0.0/5317:
 #0: ffffffff8e9c1688 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x330 drivers/char/misc.c:143
 #1: ffffffff8dfec428 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x4a/0x70 kernel/power/main.c:56
 #2: ffffffff8e010850 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0x65/0x100 kernel/notifier.c:344
 #3: ffffffff8eb149e8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1522 [inline]
 #3: ffffffff8eb149e8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1e8/0x2a0 drivers/base/firmware_loader/main.c:1575
 #4: ffffffff8eb0fa68 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:114 [inline]
 #4: ffffffff8eb0fa68 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x29/0xb0 drivers/base/power/main.c:2213

stack backtrace:
CPU: 0 UID: 0 PID: 5317 Comm: syz.0.0 Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full) 
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_lvl+0x189/0x250 lib/dump_stack.c:120
 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3044
 check_deadlock kernel/locking/lockdep.c:3096 [inline]
 validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3898
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
 __mutex_lock_common kernel/locking/mutex.c:602 [inline]
 __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747
 assign_fw+0x52/0x890 drivers/base/firmware_loader/main.c:700
 _request_firmware+0xeea/0x15b0 drivers/base/firmware_loader/main.c:918
 request_firmware drivers/base/firmware_loader/main.c:966 [inline]
 cache_firmware drivers/base/firmware_loader/main.c:1304 [inline]
 __async_dev_cache_fw_image+0x7f/0x280 drivers/base/firmware_loader/main.c:1418
 async_schedule_node_domain+0xe1/0x120 kernel/async.c:221
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x364/0x3e0 drivers/base/firmware_loader/main.c:1474
 dpm_for_each_dev+0x56/0xb0 drivers/base/power/main.c:2215
 device_cache_fw_images drivers/base/firmware_loader/main.c:1524 [inline]
 fw_pm_notify+0x200/0x2a0 drivers/base/firmware_loader/main.c:1575
 notifier_call_chain+0x1b6/0x3e0 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:102
 snapshot_open+0x133/0x280 kernel/power/user.c:87
 misc_open+0x2bc/0x330 drivers/char/misc.c:179
 chrdev_open+0x4cc/0x5e0 fs/char_dev.c:414
 do_dentry_open+0xdf0/0x1970 fs/open.c:964
 vfs_open+0x3b/0x340 fs/open.c:1094
 do_open fs/namei.c:3887 [inline]
 path_openat+0x2ee5/0x3830 fs/namei.c:4046
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1437
 do_sys_open fs/open.c:1452 [inline]
 __do_sys_openat fs/open.c:1468 [inline]
 __se_sys_openat fs/open.c:1463 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1463
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcedc78e969
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:00007fcedd690038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fcedc9b5fa0 RCX: 00007fcedc78e969
RDX: 0000000000042801 RSI: 00002000000002c0 RDI: ffffffffffffff9c
RBP: 00007fcedd690090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007fcedc9b5fa0 R15: 00007ffcc772b5c8
 </TASK>