input: syz1 as /devices/virtual/input/input5 ====================================================== WARNING: possible circular locking dependency detected 6.9.0-rc7-syzkaller-gdd5a440a31fa #0 Not tainted ------------------------------------------------------ syz-executor.0/5488 is trying to acquire lock: ffff8880261d4870 (&newdev->mutex){+.+.}-{3:3}, at: uinput_request_send drivers/input/misc/uinput.c:151 [inline] ffff8880261d4870 (&newdev->mutex){+.+.}-{3:3}, at: uinput_request_submit+0x198/0x730 drivers/input/misc/uinput.c:182 but task is already holding lock: ffff8880261d38b0 (&ff->mutex){+.+.}-{3:3}, at: input_ff_upload+0x3e0/0xaf0 drivers/input/ff-core.c:120 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ff->mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x132/0xd60 kernel/locking/mutex.c:752 input_ff_flush+0x5a/0x130 drivers/input/ff-core.c:240 input_flush_device+0x98/0xc0 drivers/input/input.c:686 evdev_release+0xf5/0x7d0 drivers/input/evdev.c:444 __fput+0x429/0x8a0 fs/file_table.c:422 __do_sys_close fs/open.c:1556 [inline] __se_sys_close+0x15c/0x1f0 fs/open.c:1541 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e -> #2 (&dev->mutex#2){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x132/0xd60 kernel/locking/mutex.c:752 input_register_handle+0x69/0x3b0 drivers/input/input.c:2555 kbd_connect+0xbb/0x130 drivers/tty/vt/keyboard.c:1589 input_attach_handler drivers/input/input.c:1064 [inline] input_register_device+0xcf6/0x1090 drivers/input/input.c:2396 acpi_button_add+0x6c2/0xb90 drivers/acpi/button.c:604 acpi_device_probe+0xa1/0x2a0 drivers/acpi/bus.c:1057 really_probe+0x2b8/0xac0 drivers/base/dd.c:656 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:798 driver_probe_device+0x50/0x420 drivers/base/dd.c:828 __driver_attach+0x45b/0x700 drivers/base/dd.c:1214 bus_for_each_dev+0x235/0x2b0 drivers/base/bus.c:368 bus_add_driver+0x343/0x610 drivers/base/bus.c:673 driver_register+0x236/0x320 drivers/base/driver.c:246 do_one_initcall+0x244/0x850 init/main.c:1245 do_initcall_level+0x157/0x210 init/main.c:1307 do_initcalls+0x3f/0x80 init/main.c:1323 kernel_init_freeable+0x431/0x5d0 init/main.c:1555 kernel_init+0x19/0x2a0 init/main.c:1444 ret_from_fork+0x47/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #1 (input_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x132/0xd60 kernel/locking/mutex.c:752 input_register_device+0xae1/0x1090 drivers/input/input.c:2389 uinput_create_device+0x40e/0x630 drivers/input/misc/uinput.c:365 uinput_ioctl_handler+0x487/0x1770 drivers/input/misc/uinput.c:904 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e -> #0 (&newdev->mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3a1f/0x7fa0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e9/0x540 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x132/0xd60 kernel/locking/mutex.c:752 uinput_request_send drivers/input/misc/uinput.c:151 [inline] uinput_request_submit+0x198/0x730 drivers/input/misc/uinput.c:182 uinput_dev_upload_effect+0x195/0x240 drivers/input/misc/uinput.c:257 input_ff_upload+0x5db/0xaf0 drivers/input/ff-core.c:150 evdev_do_ioctl drivers/input/evdev.c:1183 [inline] evdev_ioctl_handler+0x17cc/0x21a0 drivers/input/evdev.c:1272 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e 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.0/5488: #0: ffff88823bc2e910 (&evdev->mutex){+.+.}-{3:3}, at: evdev_ioctl_handler+0x121/0x21a0 drivers/input/evdev.c:1263 #1: ffff8880261d38b0 (&ff->mutex){+.+.}-{3:3}, at: input_ff_upload+0x3e0/0xaf0 drivers/input/ff-core.c:120 stack backtrace: CPU: 0 PID: 5488 Comm: syz-executor.0 Not tainted 6.9.0-rc7-syzkaller-gdd5a440a31fa #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x23d/0x360 lib/dump_stack.c:114 check_noncircular+0x375/0x4a0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x3a1f/0x7fa0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e9/0x540 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x132/0xd60 kernel/locking/mutex.c:752 uinput_request_send drivers/input/misc/uinput.c:151 [inline] uinput_request_submit+0x198/0x730 drivers/input/misc/uinput.c:182 uinput_dev_upload_effect+0x195/0x240 drivers/input/misc/uinput.c:257 input_ff_upload+0x5db/0xaf0 drivers/input/ff-core.c:150 evdev_do_ioctl drivers/input/evdev.c:1183 [inline] evdev_ioctl_handler+0x17cc/0x21a0 drivers/input/evdev.c:1272 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x84/0x190 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7feaaf27dca9 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:00007feaaff650c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007feaaf3abf80 RCX: 00007feaaf27dca9 RDX: 0000000020000300 RSI: 0000000040304580 RDI: 0000000000000004 RBP: 00007feaaf2c947e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007feaaf3abf80 R15: 00007ffc777e5828