====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc6-next-20250516-syzkaller-g8566fc3b9653 #0 Not tainted ------------------------------------------------------ syz-executor.3/6334 is trying to acquire lock: ffff8880779b3070 (&newdev->mutex){+.+.}-{4:4}, at: uinput_request_send drivers/input/misc/uinput.c:151 [inline] ffff8880779b3070 (&newdev->mutex){+.+.}-{4:4}, at: uinput_request_submit+0x139/0x650 drivers/input/misc/uinput.c:182 but task is already holding lock: ffff8880779b38b0 (&ff->mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline] ffff8880779b38b0 (&ff->mutex){+.+.}-{4:4}, at: input_ff_upload+0x264/0x880 drivers/input/ff-core.c:122 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ff->mutex){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 class_mutex_constructor include/linux/mutex.h:201 [inline] input_ff_flush+0x54/0x110 drivers/input/ff-core.c:231 input_flush_device+0x85/0xb0 drivers/input/input.c:627 evdev_release+0xc7/0x790 drivers/input/evdev.c:435 __fput+0x31c/0x7b0 fs/file_table.c:467 fput_close_sync+0xdd/0x180 fs/file_table.c:572 __do_sys_close fs/open.c:1581 [inline] __se_sys_close fs/open.c:1566 [inline] __x64_sys_close+0x7b/0xc0 fs/open.c:1566 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 -> #2 (&dev->mutex#2){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 class_mutex_intr_constructor include/linux/mutex.h:203 [inline] input_register_handle+0x178/0x480 drivers/input/input.c:2653 kbd_connect+0xc2/0x110 drivers/tty/vt/keyboard.c:1580 input_attach_handler drivers/input/input.c:993 [inline] input_register_device+0xa3a/0xd90 drivers/input/input.c:2412 acpi_button_add+0x5cc/0x9d0 drivers/acpi/button.c:621 acpi_device_probe+0x9f/0x250 drivers/acpi/bus.c:1076 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x23e/0x860 drivers/base/dd.c:657 __driver_probe_device+0x138/0x280 drivers/base/dd.c:799 driver_probe_device+0x4a/0x3a0 drivers/base/dd.c:829 __driver_attach+0x26d/0x5b0 drivers/base/dd.c:1215 bus_for_each_dev+0x211/0x270 drivers/base/bus.c:370 bus_add_driver+0x2f1/0x570 drivers/base/bus.c:678 driver_register+0x16e/0x2b0 drivers/base/driver.c:249 do_one_initcall+0x1ad/0x5b0 init/main.c:1273 do_initcall_level+0x104/0x190 init/main.c:1335 do_initcalls+0x59/0xa0 init/main.c:1351 kernel_init_freeable+0x334/0x4a0 init/main.c:1583 kernel_init+0x17/0x130 init/main.c:1473 ret_from_fork+0x2ba/0x570 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (input_mutex){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 class_mutex_intr_constructor include/linux/mutex.h:203 [inline] input_register_device+0x796/0xd90 drivers/input/input.c:2408 uinput_create_device+0x28d/0x550 drivers/input/misc/uinput.c:365 uinput_ioctl_handler+0x582/0x1160 drivers/input/misc/uinput.c:918 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xae/0x100 fs/ioctl.c:893 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 -> #0 (&newdev->mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __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:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 uinput_request_send drivers/input/misc/uinput.c:151 [inline] uinput_request_submit+0x139/0x650 drivers/input/misc/uinput.c:182 uinput_dev_upload_effect+0x118/0x1a0 drivers/input/misc/uinput.c:257 input_ff_upload+0x521/0x880 drivers/input/ff-core.c:148 evdev_do_ioctl drivers/input/evdev.c:1181 [inline] evdev_ioctl_handler+0xee1/0x1a00 drivers/input/evdev.c:1270 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xae/0x100 fs/ioctl.c:893 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 other info that might help us debug this: Chain exists of: &newdev->mutex --> &dev->mutex#2 --> &ff->mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ff->mutex); lock(&dev->mutex#2); lock(&ff->mutex); lock(&newdev->mutex); *** DEADLOCK *** 2 locks held by syz-executor.3/6334: #0: ffff888026c33118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_ioctl_handler+0x11c/0x1a00 drivers/input/evdev.c:1261 #1: ffff8880779b38b0 (&ff->mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline] #1: ffff8880779b38b0 (&ff->mutex){+.+.}-{4:4}, at: input_ff_upload+0x264/0x880 drivers/input/ff-core.c:122 stack backtrace: CPU: 1 UID: 0 PID: 6334 Comm: syz-executor.3 Not tainted 6.15.0-rc6-next-20250516-syzkaller-g8566fc3b9653 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0xfc/0x190 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __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:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 uinput_request_send drivers/input/misc/uinput.c:151 [inline] uinput_request_submit+0x139/0x650 drivers/input/misc/uinput.c:182 uinput_dev_upload_effect+0x118/0x1a0 drivers/input/misc/uinput.c:257 input_ff_upload+0x521/0x880 drivers/input/ff-core.c:148 evdev_do_ioctl drivers/input/evdev.c:1181 [inline] evdev_ioctl_handler+0xee1/0x1a00 drivers/input/evdev.c:1270 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xae/0x100 fs/ioctl.c:893 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: 0033:0x7f9abc07dea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9abce8b0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9abc1abf80 RCX: 00007f9abc07dea9 RDX: 0000000020000300 RSI: 0000000040304580 RDI: 0000000000000003 RBP: 00007f9abc0ca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f9abc1abf80 R15: 00007ffc7bcb2298