vivid-000: ================= START STATUS =================
vivid-000: Volume:
======================================================
WARNING: possible circular locking dependency detected
6.9.0-rc7-syzkaller-gfda5695d692c #0 Not tainted
------------------------------------------------------
syz-executor.2/9199 is trying to acquire lock:
ffff0000cf5d0950 (vivid_ctrls:1610:(hdl_user_aud)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_lock include/media/v4l2-ctrls.h:572 [inline]
ffff0000cf5d0950 (vivid_ctrls:1610:(hdl_user_aud)->_lock){+.+.}-{3:3}, at: log_ctrl drivers/media/v4l2-core/v4l2-ctrls-core.c:2519 [inline]
ffff0000cf5d0950 (vivid_ctrls:1610:(hdl_user_aud)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x284/0x494 drivers/media/v4l2-core/v4l2-ctrls-core.c:2557
but task is already holding lock:
ffff0000cf5d3400 (vivid_ctrls:1630:(hdl_radio_rx)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0xe4/0x494 drivers/media/v4l2-core/v4l2-ctrls-core.c:2552
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (vivid_ctrls:1630:(hdl_radio_rx)->_lock){+.+.}-{3:3}:
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608
__mutex_lock kernel/locking/mutex.c:752 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
find_ref_lock+0x5c/0x3d4 drivers/media/v4l2-core/v4l2-ctrls-core.c:1648
handler_new_ref+0xf8/0x800 drivers/media/v4l2-core/v4l2-ctrls-core.c:1685
v4l2_ctrl_add_handler+0x190/0x28c drivers/media/v4l2-core/v4l2-ctrls-core.c:2209
vivid_create_controls+0x2518/0x2f84 drivers/media/test-drivers/vivid/vivid-ctrls.c:1968
vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1854 [inline]
vivid_probe+0x37c8/0x66f8 drivers/media/test-drivers/vivid/vivid-core.c:2018
platform_probe+0x148/0x1c0 drivers/base/platform.c:1404
really_probe+0x394/0x904 drivers/base/dd.c:656
__driver_probe_device+0x194/0x374 drivers/base/dd.c:798
driver_probe_device+0x78/0x330 drivers/base/dd.c:828
__driver_attach+0x3dc/0x648 drivers/base/dd.c:1214
bus_for_each_dev+0x20c/0x298 drivers/base/bus.c:368
driver_attach+0x4c/0x5c drivers/base/dd.c:1231
bus_add_driver+0x2f0/0x58c drivers/base/bus.c:673
driver_register+0x220/0x30c drivers/base/driver.c:246
__platform_driver_register+0x74/0x8c drivers/base/platform.c:867
vivid_init+0x4c/0x8c drivers/media/test-drivers/vivid/vivid-core.c:2145
do_one_initcall+0x254/0x9e4 init/main.c:1245
do_initcall_level+0x154/0x214 init/main.c:1307
do_initcalls+0x58/0xac init/main.c:1323
do_basic_setup+0x8c/0xa0 init/main.c:1342
kernel_init_freeable+0x324/0x478 init/main.c:1555
kernel_init+0x24/0x29c init/main.c:1444
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
-> #0 (vivid_ctrls:1610:(hdl_user_aud)->_lock){+.+.}-{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+0x3384/0x763c kernel/locking/lockdep.c:5137
lock_acquire+0x248/0x73c kernel/locking/lockdep.c:5754
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608
__mutex_lock kernel/locking/mutex.c:752 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
v4l2_ctrl_lock include/media/v4l2-ctrls.h:572 [inline]
log_ctrl drivers/media/v4l2-core/v4l2-ctrls-core.c:2519 [inline]
v4l2_ctrl_handler_log_status+0x284/0x494 drivers/media/v4l2-core/v4l2-ctrls-core.c:2557
v4l2_ctrl_log_status+0xc8/0xe8 drivers/media/v4l2-core/v4l2-ctrls-api.c:1206
vidioc_log_status+0x68/0x124 drivers/media/test-drivers/vivid/vivid-core.c:426
v4l_log_status+0x88/0xf8 drivers/media/v4l2-core/v4l2-ioctl.c:2562
__video_do_ioctl+0x7f4/0xb68 drivers/media/v4l2-core/v4l2-ioctl.c:3049
video_usercopy+0xa00/0x1124 drivers/media/v4l2-core/v4l2-ioctl.c:3390
video_ioctl2+0x3c/0x50 drivers/media/v4l2-core/v4l2-ioctl.c:3444
v4l2_ioctl+0x148/0x18c drivers/media/v4l2-core/v4l2-dev.c:364
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl fs/ioctl.c:890 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:890
__invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(vivid_ctrls:1630:(hdl_radio_rx)->_lock);
lock(vivid_ctrls:1610:(hdl_user_aud)->_lock);
lock(vivid_ctrls:1630:(hdl_radio_rx)->_lock);
lock(vivid_ctrls:1610:(hdl_user_aud)->_lock);
*** DEADLOCK ***
2 locks held by syz-executor.2/9199:
#0: ffff0000cf5d5b48 (&dev->mutex#3){+.+.}-{3:3}, at: __video_do_ioctl+0x424/0xb68 drivers/media/v4l2-core/v4l2-ioctl.c:3017
#1: ffff0000cf5d3400 (vivid_ctrls:1630:(hdl_radio_rx)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0xe4/0x494 drivers/media/v4l2-core/v4l2-ctrls-core.c:2552
stack backtrace:
CPU: 0 PID: 9199 Comm: syz-executor.2 Not tainted 6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
dump_stack+0x1c/0x28 lib/dump_stack.c:123
print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060
check_noncircular+0x310/0x404 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+0x3384/0x763c kernel/locking/lockdep.c:5137
lock_acquire+0x248/0x73c kernel/locking/lockdep.c:5754
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608
__mutex_lock kernel/locking/mutex.c:752 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
v4l2_ctrl_lock include/media/v4l2-ctrls.h:572 [inline]
log_ctrl drivers/media/v4l2-core/v4l2-ctrls-core.c:2519 [inline]
v4l2_ctrl_handler_log_status+0x284/0x494 drivers/media/v4l2-core/v4l2-ctrls-core.c:2557
v4l2_ctrl_log_status+0xc8/0xe8 drivers/media/v4l2-core/v4l2-ctrls-api.c:1206
vidioc_log_status+0x68/0x124 drivers/media/test-drivers/vivid/vivid-core.c:426
v4l_log_status+0x88/0xf8 drivers/media/v4l2-core/v4l2-ioctl.c:2562
__video_do_ioctl+0x7f4/0xb68 drivers/media/v4l2-core/v4l2-ioctl.c:3049
video_usercopy+0xa00/0x1124 drivers/media/v4l2-core/v4l2-ioctl.c:3390
video_ioctl2+0x3c/0x50 drivers/media/v4l2-core/v4l2-ioctl.c:3444
v4l2_ioctl+0x148/0x18c drivers/media/v4l2-core/v4l2-dev.c:364
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:904 [inline]
__se_sys_ioctl fs/ioctl.c:890 [inline]
__arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:890
__invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
200
vivid-000: Mute: false
vivid-000: Boolean: true
vivid-000: Integer 32 Bits: 0
vivid-000: Integer 64 Bits: 0
vivid-000: Menu: Menu Item 3
vivid-000: String:
vivid-000: Bitmask: 0x80002000
vivid-000: Integer Menu: 5
vivid-000: U32 1 Element Array: [1] 24
vivid-000: U16 8x16 Matrix: [8][16] 24
vivid-000: U8 2x3x4x5 Array: [2][3][4][5] 24
vivid-000: Area: unknown type 262
vivid-000: Read-Only Integer 32 Bits: 0
vivid-000: U32 Dynamic Array: [100] 50
vivid-000: U8 Pixel Array: [320][192] 128
vivid-000: S32 2 Element Array: [2] 2
vivid-000: S64 5 Element Array: [5] 4
vivid-000: RDS Reception: true
vivid-000: RDS Program Type: 0 inactive
vivid-000: RDS PS Name: inactive
vivid-000: RDS Radio Text: inactive
vivid-000: RDS Traffic Announcement: false inactive
vivid-000: RDS Traffic Program: false inactive
vivid-000: RDS Music: false inactive
vivid-000: Radio HW Seek Mode: Bounded
vivid-000: Radio Programmable HW Seek: false
vivid-000: Generate RBDS Instead of RDS: false
vivid-000: RDS Rx I/O Mode: Block I/O
vivid-000: ================== END STATUS ==================