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: 5326 Comm: syz.0.0 Not tainted 6.15.0-rc2-syzkaller-00278-gfc96b232f8e7 #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 lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x424/0x570 lib/fault-inject.c:174
 should_failslab+0xac/0x100 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4114 [inline]
 slab_alloc_node mm/slub.c:4190 [inline]
 __kmalloc_cache_noprof+0x73/0x370 mm/slub.c:4367
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 async_schedule_node_domain+0x5c/0x110 kernel/async.c:208
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x36f/0x3e0 drivers/base/firmware_loader/main.c:1500
 dpm_for_each_dev+0x58/0xc0 drivers/base/power/main.c:2061
 device_cache_fw_images drivers/base/firmware_loader/main.c:1550 [inline]
 fw_pm_notify+0x254/0x2f0 drivers/base/firmware_loader/main.c:1601
 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
 notifier_call_chain_robust kernel/notifier.c:120 [inline]
 blocking_notifier_call_chain_robust+0xf2/0x1f0 kernel/notifier.c:345
 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:179
 chrdev_open+0x514/0x600 fs/char_dev.c:414
 do_dentry_open+0xdec/0x1960 fs/open.c:956
 vfs_open+0x3b/0x370 fs/open.c:1086
 do_open fs/namei.c:3845 [inline]
 path_openat+0x2caf/0x35d0 fs/namei.c:4004
 do_filp_open+0x284/0x4e0 fs/namei.c:4031
 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_openat fs/open.c:1460 [inline]
 __se_sys_openat fs/open.c:1455 [inline]
 __x64_sys_openat+0x249/0x2a0 fs/open.c:1455
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f14e258e169
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:00007f14e3435038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f14e27b5fa0 RCX: 00007f14e258e169
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f14e3435090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f14e27b5fa0 R15: 00007ffca6f94568
 </TASK>
============================================
WARNING: possible recursive locking detected
6.15.0-rc2-syzkaller-00278-gfc96b232f8e7 #0 Not tainted
--------------------------------------------
syz.0.0/5326 is trying to acquire lock:
ffffffff8f701508 (fw_lock){+.+.}-{4:4}, at: assign_fw+0x56/0x890 drivers/base/firmware_loader/main.c:700

but task is already holding lock:
ffffffff8f701508 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline]
ffffffff8f701508 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x23c/0x2f0 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.0.0/5326:
 #0: ffffffff8f5af928 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x54/0x340 drivers/char/misc.c:143
 #1: ffffffff8ebee028 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x60/0xa0 kernel/power/main.c:56
 #2: ffffffff8ec11690 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0xb8/0x1f0 kernel/notifier.c:344
 #3: ffffffff8f701508 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline]
 #3: ffffffff8f701508 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x23c/0x2f0 drivers/base/firmware_loader/main.c:1601
 #4: ffffffff8f6fc788 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:113 [inline]
 #4: ffffffff8f6fc788 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2b/0xc0 drivers/base/power/main.c:2059

stack backtrace:
CPU: 0 UID: 0 PID: 5326 Comm: syz.0.0 Not tainted 6.15.0-rc2-syzkaller-00278-gfc96b232f8e7 #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 lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_deadlock_bug+0x2be/0x2d0 kernel/locking/lockdep.c:3042
 check_deadlock kernel/locking/lockdep.c:3094 [inline]
 validate_chain+0x928/0x24e0 kernel/locking/lockdep.c:3896
 __lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
 lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
 __mutex_lock_common kernel/locking/mutex.c:601 [inline]
 __mutex_lock+0x1a5/0x10c0 kernel/locking/mutex.c:746
 assign_fw+0x56/0x890 drivers/base/firmware_loader/main.c:700
 _request_firmware+0xfd1/0x1540 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+0xf3/0x350 drivers/base/firmware_loader/main.c:1444
 async_schedule_node_domain+0xdc/0x110 kernel/async.c:221
 async_schedule_domain include/linux/async.h:72 [inline]
 dev_cache_fw_image+0x36f/0x3e0 drivers/base/firmware_loader/main.c:1500
 dpm_for_each_dev+0x58/0xc0 drivers/base/power/main.c:2061
 device_cache_fw_images drivers/base/firmware_loader/main.c:1550 [inline]
 fw_pm_notify+0x254/0x2f0 drivers/base/firmware_loader/main.c:1601
 notifier_call_chain+0x1a5/0x3f0 kernel/notifier.c:85
 notifier_call_chain_robust kernel/notifier.c:120 [inline]
 blocking_notifier_call_chain_robust+0xf2/0x1f0 kernel/notifier.c:345
 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:179
 chrdev_open+0x514/0x600 fs/char_dev.c:414
 do_dentry_open+0xdec/0x1960 fs/open.c:956
 vfs_open+0x3b/0x370 fs/open.c:1086
 do_open fs/namei.c:3845 [inline]
 path_openat+0x2caf/0x35d0 fs/namei.c:4004
 do_filp_open+0x284/0x4e0 fs/namei.c:4031
 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_openat fs/open.c:1460 [inline]
 __se_sys_openat fs/open.c:1455 [inline]
 __x64_sys_openat+0x249/0x2a0 fs/open.c:1455
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f14e258e169
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:00007f14e3435038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f14e27b5fa0 RCX: 00007f14e258e169
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f14e3435090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 00007f14e27b5fa0 R15: 00007ffca6f94568
 </TASK>