RAX: ffffffffffffffda RBX: 00007f817b9b5fa0 RCX: 00007f817b78e969 RDX: 0000000000040000 RSI: 00002000000002c0 RDI: ffffffffffffff9c RBP: 00007f817c5ab090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f817b9b5fa0 R15: 00007fff022f04f8 ============================================ WARNING: possible recursive locking detected 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 Not tainted -------------------------------------------- syz.5.2004/14239 is trying to acquire lock: ffffffff8e8fbfa8 (fw_lock){+.+.}-{4:4}, at: assign_fw+0x52/0x890 drivers/base/firmware_loader/main.c:700 but task is already holding lock: ffffffff8e8fbfa8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline] ffffffff8e8fbfa8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1e8/0x2a0 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.5.2004/14239: #0: ffffffff8e7a9e08 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x330 drivers/char/misc.c:143 #1: ffffffff8ddec508 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x4a/0x70 kernel/power/main.c:56 #2: ffffffff8de10490 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0x65/0x100 kernel/notifier.c:344 #3: ffffffff8e8fbfa8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1548 [inline] #3: ffffffff8e8fbfa8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1e8/0x2a0 drivers/base/firmware_loader/main.c:1601 #4: ffffffff8e8f7028 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:114 [inline] #4: ffffffff8e8f7028 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x29/0xb0 drivers/base/power/main.c:2213 stack backtrace: CPU: 1 UID: 0 PID: 14239 Comm: syz.5.2004 Not tainted 6.15.0-syzkaller-03589-gfeacb1774bd5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: 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:601 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746 assign_fw+0x52/0x890 drivers/base/firmware_loader/main.c:700 _request_firmware+0xeea/0x15b0 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+0x7f/0x280 drivers/base/firmware_loader/main.c:1444 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:1500 dpm_for_each_dev+0x53/0xb0 drivers/base/power/main.c:2215 device_cache_fw_images drivers/base/firmware_loader/main.c:1550 [inline] fw_pm_notify+0x200/0x2a0 drivers/base/firmware_loader/main.c:1601 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+0x19c/0x280 kernel/power/user.c:77 misc_open+0x2bc/0x330 drivers/char/misc.c:179 chrdev_open+0x4c9/0x5e0 fs/char_dev.c:414 do_dentry_open+0xdf3/0x1970 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: 0033:0x7f817b78e969 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:00007f817c5ab038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f817b9b5fa0 RCX: 00007f817b78e969 RDX: 0000000000040000 RSI: 00002000000002c0 RDI: ffffffffffffff9c RBP: 00007f817c5ab090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f817b9b5fa0 R15: 00007fff022f04f8