RDX: 0000000000080040 RSI: 00002000000002c0 RDI: ffffffffffffff9c
RBP: 00007fcbc5323090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007fcbc47b5fa0 R15: 00007ffde8975fb8
</TASK>
============================================
WARNING: possible recursive locking detected
6.15.0-rc6-syzkaller-00080-g1a80a098c606 #0 Not tainted
--------------------------------------------
syz.0.1592/12125 is trying to acquire lock:
ffffffff8f2f1288 (fw_lock){+.+.}-{4:4}, at: assign_fw+0x4e/0x640 drivers/base/firmware_loader/main.c:700
but task is already holding lock:
ffffffff8f2f1288 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline]
ffffffff8f2f1288 (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.0.1592/12125:
#0: ffffffff8f0e1988 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x63/0x420 drivers/char/misc.c:143
#1: ffffffff8e283dc8 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x87/0xa0 kernel/power/main.c:56
#2: ffffffff8e2c3910 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust kernel/notifier.c:344 [inline]
#2: ffffffff8e2c3910 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0xa8/0x160 kernel/notifier.c:333
#3: ffffffff8f2f1288 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline]
#3: ffffffff8f2f1288 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x69/0x150 drivers/base/firmware_loader/main.c:1601
#4: ffffffff8f2ebea8 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:113 [inline]
#4: ffffffff8f2ebea8 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev drivers/base/power/main.c:2059 [inline]
#4: ffffffff8f2ebea8 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x2d/0xb0 drivers/base/power/main.c:2052
stack backtrace:
CPU: 0 UID: 0 PID: 12125 Comm: syz.0.1592 Not tainted 6.15.0-rc6-syzkaller-00080-g1a80a098c606 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3042
check_deadlock kernel/locking/lockdep.c:3094 [inline]
validate_chain kernel/locking/lockdep.c:3896 [inline]
__lock_acquire+0xff7/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
assign_fw+0x4e/0x640 drivers/base/firmware_loader/main.c:700
_request_firmware+0x988/0x1470 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+0xb1/0x340 drivers/base/firmware_loader/main.c:1444
async_schedule_node_domain+0xd4/0x120 kernel/async.c:221
async_schedule_domain include/linux/async.h:72 [inline]
dev_cache_fw_image+0x38e/0x490 drivers/base/firmware_loader/main.c:1500
dpm_for_each_dev drivers/base/power/main.c:2061 [inline]
dpm_for_each_dev+0x5d/0xb0 drivers/base/power/main.c:2052
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+0xbc/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+0xc8/0x160 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+0x35d/0x420 drivers/char/misc.c:179
chrdev_open+0x231/0x6a0 fs/char_dev.c:414
do_dentry_open+0x741/0x1c10 fs/open.c:956
vfs_open+0x82/0x3f0 fs/open.c:1086
do_open fs/namei.c:3880 [inline]
path_openat+0x1e5e/0x2d40 fs/namei.c:4039
do_filp_open+0x20b/0x470 fs/namei.c:4066
do_sys_openat2+0x11b/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+0x174/0x210 fs/open.c:1455
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcbc458e969
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:00007fcbc5323038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fcbc47b5fa0 RCX: 00007fcbc458e969
RDX: 0000000000080040 RSI: 00002000000002c0 RDI: ffffffffffffff9c
RBP: 00007fcbc5323090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 0000000000000000 R14: 00007fcbc47b5fa0 R15: 00007ffde8975fb8
</TASK>