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: 5333 Comm: syz.0.0 Not tainted 6.12.0-syzkaller-01782-gbf9aa14fc523 #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+0x241/0x360 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:53 [inline]
 should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154
 should_failslab+0xac/0x100 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4038 [inline]
 slab_alloc_node mm/slub.c:4114 [inline]
 __kmalloc_cache_noprof+0x6c/0x2c0 mm/slub.c:4290
 kmalloc_noprof include/linux/slab.h:879 [inline]
 kzalloc_noprof include/linux/slab.h:1015 [inline]
 async_schedule_node_domain+0x5c/0x110 kernel/async.c:208
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x36d/0x3e0 drivers/base/firmware_loader/main.c:1501
 dpm_for_each_dev+0x58/0xc0 drivers/base/power/main.c:1963
 device_cache_fw_images drivers/base/firmware_loader/main.c:1551 [inline]
 fw_pm_notify+0x24a/0x2f0 drivers/base/firmware_loader/main.c:1602
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 notifier_call_chain_robust kernel/notifier.c:128 [inline]
 blocking_notifier_call_chain_robust+0xe8/0x1e0 kernel/notifier.c:353
 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:102
 snapshot_open+0x132/0x280 kernel/power/user.c:87
 misc_open+0x2cc/0x340 drivers/char/misc.c:165
 chrdev_open+0x521/0x600 fs/char_dev.c:414
 do_dentry_open+0x978/0x1460 fs/open.c:941
 vfs_open+0x3e/0x330 fs/open.c:1071
 do_open fs/namei.c:3828 [inline]
 path_openat+0x2c84/0x3590 fs/namei.c:3987
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1398
 do_sys_open fs/open.c:1413 [inline]
 __do_sys_openat fs/open.c:1429 [inline]
 __se_sys_openat fs/open.c:1424 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1424
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4438f7e759
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:00007f4439e39038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4439136058 RCX: 00007f4438f7e759
RDX: 0000000000000001 RSI: 00000000200000c0 RDI: ffffffffffffff9c
RBP: 00007f4439e39090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f4439136058 R15: 00007ffdad346268
 </TASK>
============================================
WARNING: possible recursive locking detected
6.12.0-syzkaller-01782-gbf9aa14fc523 #0 Not tainted
--------------------------------------------
syz.0.0/5333 is trying to acquire lock:
ffffffff8f2e6dc8 (fw_lock){+.+.}-{4:4}, at: assign_fw+0x56/0x890 drivers/base/firmware_loader/main.c:700

but task is already holding lock:
ffffffff8f2e6dc8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1549 [inline]
ffffffff8f2e6dc8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x232/0x2f0 drivers/base/firmware_loader/main.c:1602

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.0.0/5333:
 #0: ffffffff8f198b08 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x54/0x340 drivers/char/misc.c:129
 #1: ffffffff8e7ef5e8 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x60/0xa0 kernel/power/main.c:56
 #2: ffffffff8e80faf0 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0xac/0x1e0 kernel/notifier.c:352
 #3: ffffffff8f2e6dc8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1549 [inline]
 #3: ffffffff8f2e6dc8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x232/0x2f0 drivers/base/firmware_loader/main.c:1602
 #4: ffffffff8f2e1e68 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:113 [inline]
 #4: ffffffff8f2e1e68 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2b/0xc0 drivers/base/power/main.c:1961

stack backtrace:
CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 Not tainted 6.12.0-syzkaller-01782-gbf9aa14fc523 #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+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037
 check_deadlock kernel/locking/lockdep.c:3089 [inline]
 validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891
 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849
 __mutex_lock_common kernel/locking/mutex.c:585 [inline]
 __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735
 assign_fw+0x56/0x890 drivers/base/firmware_loader/main.c:700
 _request_firmware+0xe16/0x13b0 drivers/base/firmware_loader/main.c:945
 request_firmware drivers/base/firmware_loader/main.c:993 [inline]
 cache_firmware drivers/base/firmware_loader/main.c:1331 [inline]
 __async_dev_cache_fw_image+0xe7/0x320 drivers/base/firmware_loader/main.c:1445
 async_schedule_node_domain+0xdc/0x110 kernel/async.c:221
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x36d/0x3e0 drivers/base/firmware_loader/main.c:1501
 dpm_for_each_dev+0x58/0xc0 drivers/base/power/main.c:1963
 device_cache_fw_images drivers/base/firmware_loader/main.c:1551 [inline]
 fw_pm_notify+0x24a/0x2f0 drivers/base/firmware_loader/main.c:1602
 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93
 notifier_call_chain_robust kernel/notifier.c:128 [inline]
 blocking_notifier_call_chain_robust+0xe8/0x1e0 kernel/notifier.c:353
 pm_notifier_call_chain_robust+0x2c/0x60 kernel/power/main.c:102
 snapshot_open+0x132/0x280 kernel/power/user.c:87
 misc_open+0x2cc/0x340 drivers/char/misc.c:165
 chrdev_open+0x521/0x600 fs/char_dev.c:414
 do_dentry_open+0x978/0x1460 fs/open.c:941
 vfs_open+0x3e/0x330 fs/open.c:1071
 do_open fs/namei.c:3828 [inline]
 path_openat+0x2c84/0x3590 fs/namei.c:3987
 do_filp_open+0x27f/0x4e0 fs/namei.c:4014
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1398
 do_sys_open fs/open.c:1413 [inline]
 __do_sys_openat fs/open.c:1429 [inline]
 __se_sys_openat fs/open.c:1424 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1424
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4438f7e759
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:00007f4439e39038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f4439136058 RCX: 00007f4438f7e759
RDX: 0000000000000001 RSI: 00000000200000c0 RDI: ffffffffffffff9c
RBP: 00007f4439e39090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f4439136058 R15: 00007ffdad346268
 </TASK>