======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc4-syzkaller-00291-g2a239ffbebb5 #0 Not tainted
------------------------------------------------------
syz.0.886/8865 is trying to acquire lock:
ffff88802fb92070 (&newdev->mutex){+.+.}-{4:4}, at: uinput_request_send drivers/input/misc/uinput.c:151 [inline]
ffff88802fb92070 (&newdev->mutex){+.+.}-{4:4}, at: uinput_request_submit+0x188/0x6f0 drivers/input/misc/uinput.c:182
but task is already holding lock:
ffff88802fb948b0 (&ff->mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
ffff88802fb948b0 (&ff->mutex){+.+.}-{4:4}, at: input_ff_upload+0x398/0xae0 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:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
class_mutex_constructor include/linux/mutex.h:201 [inline]
input_ff_flush+0x5e/0x140 drivers/input/ff-core.c:231
input_flush_device+0xa3/0xd0 drivers/input/input.c:627
evdev_release+0xe1/0x800 drivers/input/evdev.c:435
__fput+0x449/0xa70 fs/file_table.c:465
fput_close_sync+0x119/0x200 fs/file_table.c:570
__do_sys_close fs/open.c:1581 [inline]
__se_sys_close fs/open.c:1566 [inline]
__x64_sys_close+0x7f/0x110 fs/open.c:1566
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 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:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
class_mutex_intr_constructor include/linux/mutex.h:203 [inline]
input_register_handle+0x18f/0x4c0 drivers/input/input.c:2653
kbd_connect+0xc3/0x140 drivers/tty/vt/keyboard.c:1587
input_attach_handler drivers/input/input.c:993 [inline]
input_register_device+0xceb/0x10b0 drivers/input/input.c:2412
acpi_button_add+0x6b1/0xb50 drivers/acpi/button.c:621
acpi_device_probe+0xa5/0x2d0 drivers/acpi/bus.c:1076
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9a0 drivers/base/dd.c:657
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
__driver_attach+0x452/0x700 drivers/base/dd.c:1215
bus_for_each_dev+0x230/0x2b0 drivers/base/bus.c:370
bus_add_driver+0x345/0x640 drivers/base/bus.c:678
driver_register+0x23a/0x320 drivers/base/driver.c:249
do_one_initcall+0x233/0x820 init/main.c:1257
do_initcall_level+0x137/0x1f0 init/main.c:1319
do_initcalls+0x69/0xd0 init/main.c:1335
kernel_init_freeable+0x3d9/0x570 init/main.c:1567
kernel_init+0x1d/0x1d0 init/main.c:1457
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
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:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
class_mutex_intr_constructor include/linux/mutex.h:203 [inline]
input_register_device+0xa74/0x10b0 drivers/input/input.c:2408
uinput_create_device+0x422/0x670 drivers/input/misc/uinput.c:365
uinput_ioctl_handler+0x3f0/0x1570 drivers/input/misc/uinput.c:918
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 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:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
__lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
uinput_request_send drivers/input/misc/uinput.c:151 [inline]
uinput_request_submit+0x188/0x6f0 drivers/input/misc/uinput.c:182
uinput_dev_upload_effect+0x150/0x1e0 drivers/input/misc/uinput.c:257
input_ff_upload+0x5f9/0xae0 drivers/input/ff-core.c:148
evdev_do_ioctl drivers/input/evdev.c:1181 [inline]
evdev_ioctl_handler+0x1644/0x1f10 drivers/input/evdev.c:1270
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 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.0.886/8865:
#0: ffff8880518f6118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_ioctl_handler+0x121/0x1f10 drivers/input/evdev.c:1261
#1: ffff88802fb948b0 (&ff->mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:201 [inline]
#1: ffff88802fb948b0 (&ff->mutex){+.+.}-{4:4}, at: input_ff_upload+0x398/0xae0 drivers/input/ff-core.c:122
stack backtrace:
CPU: 0 UID: 0 PID: 8865 Comm: syz.0.886 Not tainted 6.15.0-rc4-syzkaller-00291-g2a239ffbebb5 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079
check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
__lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
uinput_request_send drivers/input/misc/uinput.c:151 [inline]
uinput_request_submit+0x188/0x6f0 drivers/input/misc/uinput.c:182
uinput_dev_upload_effect+0x150/0x1e0 drivers/input/misc/uinput.c:257
input_ff_upload+0x5f9/0xae0 drivers/input/ff-core.c:148
evdev_do_ioctl drivers/input/evdev.c:1181 [inline]
evdev_ioctl_handler+0x1644/0x1f10 drivers/input/evdev.c:1270
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f34fdb8e969
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:00007f34fe99e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f34fddb5fa0 RCX: 00007f34fdb8e969
RDX: 0000200000000300 RSI: 0000000040304580 RDI: 0000000000000005
RBP: 00007f34fdc10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f34fddb5fa0 R15: 00007f34fdedfa28
</TASK>