RSP: 002b:00007fbfa3b0a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fbfa2f16038 RCX: 00007fbfa2d80949 RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007fbfa3b0a0a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000006e R14: 00007fbfa2f16038 R15: 00007ffc17c5e8e8 ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.0.15/6433 is trying to acquire lock: ffffffff8f1945e8 (fw_lock){+.+.}-{4:4}, at: assign_fw+0x52/0x8d0 drivers/base/firmware_loader/main.c:700 but task is already holding lock: ffffffff8f1945e8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1504 [inline] ffffffff8f1945e8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1f4/0x2d0 drivers/base/firmware_loader/main.c:1557 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.0.15/6433: #0: ffffffff8f01a888 (misc_mtx){+.+.}-{4:4}, at: misc_open+0x51/0x350 drivers/char/misc.c:125 #1: ffffffff8e607ea8 (system_transition_mutex){+.+.}-{4:4}, at: lock_system_sleep+0x49/0x70 kernel/power/main.c:71 #2: ffffffff8e62f510 ((pm_chain_head).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain_robust+0x65/0x100 kernel/notifier.c:344 #3: ffffffff8f1945e8 (fw_lock){+.+.}-{4:4}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1504 [inline] #3: ffffffff8f1945e8 (fw_lock){+.+.}-{4:4}, at: fw_pm_notify+0x1f4/0x2d0 drivers/base/firmware_loader/main.c:1557 #4: ffffffff8f18f468 (dpm_list_mtx){+.+.}-{4:4}, at: device_pm_lock drivers/base/power/main.c:127 [inline] #4: ffffffff8f18f468 (dpm_list_mtx){+.+.}-{4:4}, at: dpm_for_each_dev+0x29/0xb0 drivers/base/power/main.c:2324 stack backtrace: CPU: 1 UID: 0 PID: 6433 Comm: syz.0.15 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 assign_fw+0x52/0x8d0 drivers/base/firmware_loader/main.c:700 _request_firmware+0xfb6/0x1780 drivers/base/firmware_loader/main.c:901 request_firmware drivers/base/firmware_loader/main.c:948 [inline] cache_firmware drivers/base/firmware_loader/main.c:1286 [inline] __async_dev_cache_fw_image+0x7f/0x2d0 drivers/base/firmware_loader/main.c:1400 async_schedule_node_domain+0xe1/0x120 kernel/async.c:221 async_schedule_domain include/linux/async.h:72 [inline] dev_cache_fw_image+0x36c/0x3f0 drivers/base/firmware_loader/main.c:1456 dpm_for_each_dev+0x56/0xb0 drivers/base/power/main.c:2326 device_cache_fw_images drivers/base/firmware_loader/main.c:1506 [inline] fw_pm_notify+0x20c/0x2d0 drivers/base/firmware_loader/main.c:1557 notifier_call_chain+0x1be/0x400 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:172 snapshot_open+0x19c/0x280 kernel/power/user.c:77 misc_open+0x2d5/0x350 drivers/char/misc.c:163 chrdev_open+0x4cd/0x5e0 fs/char_dev.c:411 do_dentry_open+0x785/0x14e0 fs/open.c:949 vfs_open+0x3b/0x340 fs/open.c:1081 do_open fs/namei.c:4677 [inline] path_openat+0x2e08/0x3860 fs/namei.c:4836 do_file_open+0x23e/0x4a0 fs/namei.c:4865 do_sys_openat2+0x113/0x200 fs/open.c:1366 do_sys_open fs/open.c:1372 [inline] __do_sys_openat fs/open.c:1388 [inline] __se_sys_openat fs/open.c:1383 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1383 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbfa2d80949 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbfa3b0a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fbfa2f16038 RCX: 00007fbfa2d80949 RDX: 0000000000000000 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007fbfa3b0a0a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 000000000000006e R14: 00007fbfa2f16038 R15: 00007ffc17c5e8e8