RDX: 0000000000000001 RSI: 00000000200000c0 RDI: ffffffffffffff9c RBP: 00007f059e248090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f059e95ef80 R15: 00007ffc1e3d5e98 ============================================ WARNING: possible recursive locking detected 5.9.0-syzkaller #0 Not tainted -------------------------------------------- syz.0.15/3964 is trying to acquire lock: ffffffff836b9ba8 (fw_lock){+.+.}-{3:3}, at: assign_fw+0x24/0x210 drivers/base/firmware_loader/main.c:680 but task is already holding lock: ffffffff836b9ba8 (fw_lock){+.+.}-{3:3}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1396 [inline] ffffffff836b9ba8 (fw_lock){+.+.}-{3:3}, at: fw_pm_notify+0x46/0xf0 drivers/base/firmware_loader/main.c:1449 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.0.15/3964: #0: ffffffff836acc08 (misc_mtx){+.+.}-{3:3}, at: misc_open+0x1f/0x150 drivers/char/misc.c:107 #1: ffffffff834e0488 (system_transition_mutex){+.+.}-{3:3}, at: snapshot_open+0x1c/0x140 kernel/power/user.c:54 #2: ffffffff834e54f0 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_call_chain_robust kernel/notifier.c:301 [inline] #2: ffffffff834e54f0 ((pm_chain_head).rwsem){++++}-{3:3}, at: blocking_notifier_call_chain_robust+0x43/0xc0 kernel/notifier.c:290 #3: ffffffff836b9ba8 (fw_lock){+.+.}-{3:3}, at: device_cache_fw_images drivers/base/firmware_loader/main.c:1396 [inline] #3: ffffffff836b9ba8 (fw_lock){+.+.}-{3:3}, at: fw_pm_notify+0x46/0xf0 drivers/base/firmware_loader/main.c:1449 #4: ffffffff836b8fe8 (dpm_list_mtx){+.+.}-{3:3}, at: device_pm_lock drivers/base/power/main.c:114 [inline] #4: ffffffff836b8fe8 (dpm_list_mtx){+.+.}-{3:3}, at: dpm_for_each_dev drivers/base/power/main.c:1973 [inline] #4: ffffffff836b8fe8 (dpm_list_mtx){+.+.}-{3:3}, at: dpm_for_each_dev+0x1d/0x70 drivers/base/power/main.c:1966 stack backtrace: CPU: 1 PID: 3964 Comm: syz.0.15 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x77/0x97 lib/dump_stack.c:118 print_deadlock_bug kernel/locking/lockdep.c:2759 [inline] check_deadlock kernel/locking/lockdep.c:2800 [inline] validate_chain kernel/locking/lockdep.c:3591 [inline] __lock_acquire.cold+0x124/0x2b2 kernel/locking/lockdep.c:4837 lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0xbf/0x390 kernel/locking/lockdep.c:5407 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x61/0x610 kernel/locking/mutex.c:1103 assign_fw+0x24/0x210 drivers/base/firmware_loader/main.c:680 _request_firmware+0x42c/0x4f0 drivers/base/firmware_loader/main.c:834 request_firmware drivers/base/firmware_loader/main.c:875 [inline] cache_firmware drivers/base/firmware_loader/main.c:1177 [inline] __async_dev_cache_fw_image+0x44/0x150 drivers/base/firmware_loader/main.c:1292 async_schedule_node_domain+0x86/0x1e0 kernel/async.c:186 async_schedule_domain include/linux/async.h:72 [inline] dev_cache_fw_image+0x166/0x1a0 drivers/base/firmware_loader/main.c:1348 dpm_for_each_dev drivers/base/power/main.c:1975 [inline] dpm_for_each_dev+0x3e/0x70 drivers/base/power/main.c:1966 device_cache_fw_images drivers/base/firmware_loader/main.c:1398 [inline] fw_pm_notify+0x5e/0xf0 drivers/base/firmware_loader/main.c:1449 notifier_call_chain+0x5c/0x90 kernel/notifier.c:83 notifier_call_chain_robust kernel/notifier.c:118 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:302 [inline] blocking_notifier_call_chain_robust+0x63/0xc0 kernel/notifier.c:290 pm_notifier_call_chain_robust+0x14/0x30 kernel/power/main.c:87 snapshot_open+0x108/0x140 kernel/power/user.c:85 misc_open+0x116/0x150 drivers/char/misc.c:141 chrdev_open+0xbe/0x250 fs/char_dev.c:414 do_dentry_open+0x15e/0x380 fs/open.c:817 do_open fs/namei.c:3251 [inline] path_openat+0x3a6/0xaa0 fs/namei.c:3368 do_filp_open+0x83/0x130 fs/namei.c:3395 do_sys_openat2+0x92/0x150 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_openat fs/open.c:1200 [inline] __se_sys_openat fs/open.c:1195 [inline] __x64_sys_openat+0x4f/0x90 fs/open.c:1195 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f059e7c2ef9 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:00007f059e248038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f059e95ef80 RCX: 00007f059e7c2ef9 RDX: 0000000000000001 RSI: 00000000200000c0 RDI: ffffffffffffff9c RBP: 00007f059e248090 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 00007f059e95ef80 R15: 00007ffc1e3d5e98