RBP: 00007f266a00a090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f2669335f80 R15: 00007f266945fa28 ============================================ WARNING: possible recursive locking detected 6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0 Not tainted -------------------------------------------- syz.4.65/6079 is trying to acquire lock: ffffffff8f2de388 (fw_lock){+.+.}-{3:3}, at: assign_fw+0x56/0x890 drivers/base/firmware_loader/main.c:700 but task is already holding lock: ffffffff8f2de388 (fw_lock){+.+.}-{3:3}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1549 [inline] (fw_lock){+.+.}-{3:3}, 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.4.65/6079: #0: ffffffff8f190208 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x54/0x340 drivers/char/misc.c:129 #1: ffffffff8e7eada8 (system_transition_mutex){+.+.}-{3:3}, at: lock_system_sleep+0x60/0xa0 kernel/power/main.c:56 #2: ffffffff8e80b0f0 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_call_chain_robust+0xac/0x1e0 kernel/notifier.c:352 #3: ffffffff8f2de388 (fw_lock){+.+.}-{3:3}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1549 [inline] #3: ffffffff8f2de388 (fw_lock){+.+.}-{3:3}, at: fw_pm_notify+0x232/0x2f0 drivers/base/firmware_loader/main.c:1602 #4: ffffffff8f2d9428 (dpm_list_mtx){+.+.}-{3:3}, at: device_pm_lock drivers/base/power/main.c:113 [inline] #4: ffffffff8f2d9428 (dpm_list_mtx){+.+.}-{3:3}, at: dpm_for_each_dev+0x2b/0xc0 drivers/base/power/main.c:1961 stack backtrace: CPU: 1 UID: 0 PID: 6079 Comm: syz.4.65 Not tainted 6.12.0-rc6-syzkaller-00272-gda4373fbcf00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __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+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 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:958 vfs_open+0x3e/0x330 fs/open.c:1088 do_open fs/namei.c:3774 [inline] path_openat+0x2c84/0x3590 fs/namei.c:3933 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1441 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: 0033:0x7f266917e719 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:00007f266a00a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f2669335f80 RCX: 00007f266917e719 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: ffffffffffffff9c RBP: 00007f266a00a090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f2669335f80 R15: 00007f266945fa28