input: syz1 as /devices/virtual/input/input2
======================================================
WARNING: possible circular locking dependency detected
6.1.134-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor240/4298 is trying to acquire lock:
ffff0000d9ccf870 (&newdev->mutex){+.+.}-{3:3}, at: uinput_request_send drivers/input/misc/uinput.c:150 [inline]
ffff0000d9ccf870 (&newdev->mutex){+.+.}-{3:3}, at: uinput_request_submit+0x188/0x654 drivers/input/misc/uinput.c:181
but task is already holding lock:
ffff0000db3500b0 (&ff->mutex){+.+.}-{3:3}, at: input_ff_upload+0x31c/0x834 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){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
input_ff_upload+0x31c/0x834 drivers/input/ff-core.c:122
evdev_do_ioctl drivers/input/evdev.c:1183 [inline]
evdev_ioctl_handler+0x1fd8/0x2d60 drivers/input/evdev.c:1272
evdev_ioctl+0x38/0x4c drivers/input/evdev.c:1281
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
-> #2 (&evdev->mutex){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
evdev_mark_dead drivers/input/evdev.c:1314 [inline]
evdev_cleanup+0x38/0x16c drivers/input/evdev.c:1323
evdev_disconnect+0x58/0xc0 drivers/input/evdev.c:1407
__input_unregister_device+0x31c/0x5c0 drivers/input/input.c:2296
input_unregister_device+0xb0/0xfc drivers/input/input.c:2514
uinput_destroy_device+0x5a4/0x79c drivers/input/misc/uinput.c:298
uinput_release+0x44/0x60 drivers/input/misc/uinput.c:724
__fput+0x1c8/0x7c8 fs/file_table.c:320
____fput+0x20/0x30 fs/file_table.c:348
task_work_run+0x240/0x2f0 kernel/task_work.c:203
exit_task_work include/linux/task_work.h:39 [inline]
do_exit+0x550/0x1a84 kernel/exit.c:871
do_group_exit+0x194/0x22c kernel/exit.c:1021
__do_sys_exit_group kernel/exit.c:1032 [inline]
__se_sys_exit_group kernel/exit.c:1030 [inline]
__wake_up_parent+0x0/0x60 kernel/exit.c:1030
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
-> #1 (input_mutex){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_interruptible_nested+0x38/0x44 kernel/locking/mutex.c:821
input_register_device+0x914/0xf8c drivers/input/input.c:2463
uinput_create_device+0x360/0x528 drivers/input/misc/uinput.c:364
uinput_ioctl_handler+0x8b0/0x16c0 drivers/input/misc/uinput.c:884
uinput_ioctl+0x38/0x4c drivers/input/misc/uinput.c:1055
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
-> #0 (&newdev->mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_interruptible_nested+0x38/0x44 kernel/locking/mutex.c:821
uinput_request_send drivers/input/misc/uinput.c:150 [inline]
uinput_request_submit+0x188/0x654 drivers/input/misc/uinput.c:181
uinput_dev_upload_effect+0x170/0x218 drivers/input/misc/uinput.c:256
input_ff_upload+0x49c/0x834 drivers/input/ff-core.c:152
evdev_do_ioctl drivers/input/evdev.c:1183 [inline]
evdev_ioctl_handler+0x1fd8/0x2d60 drivers/input/evdev.c:1272
evdev_ioctl+0x38/0x4c drivers/input/evdev.c:1281
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
other info that might help us debug this:
Chain exists of:
&newdev->mutex --> &evdev->mutex --> &ff->mutex
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&ff->mutex);
lock(&evdev->mutex);
lock(&ff->mutex);
lock(&newdev->mutex);
*** DEADLOCK ***
2 locks held by syz-executor240/4298:
#0: ffff0000c4be1110 (&evdev->mutex){+.+.}-{3:3}, at: evdev_ioctl_handler+0x11c/0x2d60 drivers/input/evdev.c:1263
#1: ffff0000db3500b0 (&ff->mutex){+.+.}-{3:3}, at: input_ff_upload+0x31c/0x834 drivers/input/ff-core.c:122
stack backtrace:
CPU: 1 PID: 4298 Comm: syz-executor240 Not tainted 6.1.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
dump_stack+0x1c/0x105c lib/dump_stack.c:113
print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048
check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170
check_prev_add kernel/locking/lockdep.c:3090 [inline]
check_prevs_add kernel/locking/lockdep.c:3209 [inline]
validate_chain kernel/locking/lockdep.c:3825 [inline]
__lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
__mutex_lock kernel/locking/mutex.c:747 [inline]
mutex_lock_interruptible_nested+0x38/0x44 kernel/locking/mutex.c:821
uinput_request_send drivers/input/misc/uinput.c:150 [inline]
uinput_request_submit+0x188/0x654 drivers/input/misc/uinput.c:181
uinput_dev_upload_effect+0x170/0x218 drivers/input/misc/uinput.c:256
input_ff_upload+0x49c/0x834 drivers/input/ff-core.c:152
evdev_do_ioctl drivers/input/evdev.c:1183 [inline]
evdev_ioctl_handler+0x1fd8/0x2d60 drivers/input/evdev.c:1272
evdev_ioctl+0x38/0x4c drivers/input/evdev.c:1281
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585