====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc1-syzkaller-gd8d936c51388 #0 Not tainted ------------------------------------------------------ syz.0.230/6014 is trying to acquire lock: ffff888118a572c0 (&dev->mutex#2){+.+.}-{4:4}, at: input_disconnect_device drivers/input/input.c:729 [inline] ffff888118a572c0 (&dev->mutex#2){+.+.}-{4:4}, at: __input_unregister_device+0x24/0x450 drivers/input/input.c:2275 but task is already holding lock: ffff88811c1fde18 (&hdev->ll_open_lock){+.+.}-{4:4}, at: hid_hw_open+0x25/0x170 drivers/hid/hid-core.c:2392 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&hdev->ll_open_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 hid_hw_open+0x25/0x170 drivers/hid/hid-core.c:2392 input_open_device+0x22c/0x390 drivers/input/input.c:620 evdev_open_device drivers/input/evdev.c:391 [inline] evdev_open+0x52d/0x690 drivers/input/evdev.c:478 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x6cb/0x1390 fs/open.c:945 vfs_open+0x82/0x3f0 fs/open.c:1075 do_open fs/namei.c:3828 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3987 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&dev->mutex#2){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 input_disconnect_device drivers/input/input.c:729 [inline] __input_unregister_device+0x24/0x450 drivers/input/input.c:2275 input_unregister_device+0xb9/0x100 drivers/input/input.c:2516 steam_sensors_unregister.part.0+0x10c/0x2c0 drivers/hid/hid-steam.c:935 steam_sensors_unregister drivers/hid/hid-steam.c:924 [inline] steam_client_ll_open+0xbc/0x100 drivers/hid/hid-steam.c:1120 hid_hw_open+0xe2/0x170 drivers/hid/hid-core.c:2397 hidraw_open+0x274/0x7e0 drivers/hid/hidraw.c:308 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x6cb/0x1390 fs/open.c:945 vfs_open+0x82/0x3f0 fs/open.c:1075 do_open fs/namei.c:3828 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3987 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&hdev->ll_open_lock); lock(&dev->mutex#2); lock(&hdev->ll_open_lock); lock(&dev->mutex#2); *** DEADLOCK *** 2 locks held by syz.0.230/6014: #0: ffffffff89f70d50 (minors_rwsem){+.+.}-{4:4}, at: hidraw_open+0xa6/0x7e0 drivers/hid/hidraw.c:294 #1: ffff88811c1fde18 (&hdev->ll_open_lock){+.+.}-{4:4}, at: hid_hw_open+0x25/0x170 drivers/hid/hid-core.c:2392 stack backtrace: CPU: 1 UID: 0 PID: 6014 Comm: syz.0.230 Not tainted 6.13.0-rc1-syzkaller-gd8d936c51388 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain kernel/locking/lockdep.c:3904 [inline] __lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x19b/0xa60 kernel/locking/mutex.c:735 input_disconnect_device drivers/input/input.c:729 [inline] __input_unregister_device+0x24/0x450 drivers/input/input.c:2275 input_unregister_device+0xb9/0x100 drivers/input/input.c:2516 steam_sensors_unregister.part.0+0x10c/0x2c0 drivers/hid/hid-steam.c:935 steam_sensors_unregister drivers/hid/hid-steam.c:924 [inline] steam_client_ll_open+0xbc/0x100 drivers/hid/hid-steam.c:1120 hid_hw_open+0xe2/0x170 drivers/hid/hid-core.c:2397 hidraw_open+0x274/0x7e0 drivers/hid/hidraw.c:308 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x6cb/0x1390 fs/open.c:945 vfs_open+0x82/0x3f0 fs/open.c:1075 do_open fs/namei.c:3828 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3987 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7e4cd6e840 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007f7e4b3e6b90 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000700 RCX: 00007f7e4cd6e840 RDX: 0000000000000700 RSI: 00007f7e4b3e6c30 RDI: 00000000ffffff9c RBP: 00007f7e4b3e6c30 R08: 0000000000000000 R09: 0023776172646968 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7e4cf35fa0 R15: 00007fff92633c58