vivid-000: ================= START STATUS ================= vivid-000: Volume: ====================================================== WARNING: possible circular locking dependency detected 6.9.0-syzkaller-05151-g1b294a1f3561 #0 Not tainted ------------------------------------------------------ syz-executor.3/10189 is trying to acquire lock: ffff888025d80950 (vivid_ctrls:1610:(hdl_user_aud)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_lock include/media/v4l2-ctrls.h:572 [inline] ffff888025d80950 (vivid_ctrls:1610:(hdl_user_aud)->_lock){+.+.}-{3:3}, at: log_ctrl drivers/media/v4l2-core/v4l2-ctrls-core.c:2519 [inline] ffff888025d80950 (vivid_ctrls:1610:(hdl_user_aud)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x2f3/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2557 but task is already holding lock: ffff888025d81d30 (vivid_ctrls:1622:(hdl_vid_out)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x11f/0x540 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:1622:(hdl_vid_out)->_lock){+.+.}-{3:3}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 find_ref_lock+0x5b/0x470 drivers/media/v4l2-core/v4l2-ctrls-core.c:1648 handler_new_ref+0x102/0x940 drivers/media/v4l2-core/v4l2-ctrls-core.c:1685 v4l2_ctrl_add_handler+0x1a1/0x290 drivers/media/v4l2-core/v4l2-ctrls-core.c:2209 vivid_create_controls+0x26bb/0x3580 drivers/media/test-drivers/vivid/vivid-ctrls.c:1943 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1854 [inline] vivid_probe+0x4289/0x6fa0 drivers/media/test-drivers/vivid/vivid-core.c:2018 platform_probe+0x13a/0x1c0 drivers/base/platform.c:1404 really_probe+0x2b8/0xad0 drivers/base/dd.c:656 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:798 driver_probe_device+0x50/0x430 drivers/base/dd.c:828 __driver_attach+0x45f/0x710 drivers/base/dd.c:1214 bus_for_each_dev+0x239/0x2b0 drivers/base/bus.c:368 bus_add_driver+0x347/0x620 drivers/base/bus.c:673 driver_register+0x23a/0x320 drivers/base/driver.c:246 vivid_init+0x3d/0x70 drivers/media/test-drivers/vivid/vivid-core.c:2145 do_one_initcall+0x248/0x880 init/main.c:1245 do_initcall_level+0x157/0x210 init/main.c:1307 do_initcalls+0x3f/0x80 init/main.c:1323 kernel_init_freeable+0x435/0x5d0 init/main.c:1556 kernel_init+0x1d/0x2b0 init/main.c:1445 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 -> #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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 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+0x2f3/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2557 v4l2_ctrl_log_status+0xe3/0x100 drivers/media/v4l2-core/v4l2-ctrls-api.c:1206 vidioc_log_status+0x63/0x110 drivers/media/test-drivers/vivid/vivid-core.c:426 v4l_log_status+0x8f/0x110 drivers/media/v4l2-core/v4l2-ioctl.c:2562 __video_do_ioctl+0xc26/0xde0 drivers/media/v4l2-core/v4l2-ioctl.c:3049 video_usercopy+0x899/0x1180 drivers/media/v4l2-core/v4l2-ioctl.c:3390 v4l2_ioctl+0x18c/0x1e0 drivers/media/v4l2-core/v4l2-dev.c:364 v4l2_compat_ioctl32+0x1da/0x260 __do_compat_sys_ioctl fs/ioctl.c:1004 [inline] __se_compat_sys_ioctl+0x51c/0xca0 fs/ioctl.c:947 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb8/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(vivid_ctrls:1622:(hdl_vid_out)->_lock); lock(vivid_ctrls:1610:(hdl_user_aud)->_lock); lock(vivid_ctrls:1622:(hdl_vid_out)->_lock); lock(vivid_ctrls:1610:(hdl_user_aud)->_lock); *** DEADLOCK *** 2 locks held by syz-executor.3/10189: #0: ffff888025d85aa8 (&dev->mutex#3){+.+.}-{3:3}, at: __video_do_ioctl+0x4ed/0xde0 drivers/media/v4l2-core/v4l2-ioctl.c:3017 #1: ffff888025d81d30 (vivid_ctrls:1622:(hdl_vid_out)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x11f/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2552 stack backtrace: CPU: 1 PID: 10189 Comm: syz-executor.3 Not tainted 6.9.0-syzkaller-05151-g1b294a1f3561 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_noncircular+0x36a/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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 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+0x2f3/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2557 v4l2_ctrl_log_status+0xe3/0x100 drivers/media/v4l2-core/v4l2-ctrls-api.c:1206 vidioc_log_status+0x63/0x110 drivers/media/test-drivers/vivid/vivid-core.c:426 v4l_log_status+0x8f/0x110 drivers/media/v4l2-core/v4l2-ioctl.c:2562 __video_do_ioctl+0xc26/0xde0 drivers/media/v4l2-core/v4l2-ioctl.c:3049 video_usercopy+0x899/0x1180 drivers/media/v4l2-core/v4l2-ioctl.c:3390 v4l2_ioctl+0x18c/0x1e0 drivers/media/v4l2-core/v4l2-dev.c:364 v4l2_compat_ioctl32+0x1da/0x260 __do_compat_sys_ioctl fs/ioctl.c:1004 [inline] __se_compat_sys_ioctl+0x51c/0xca0 fs/ioctl.c:947 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0xb8/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x34/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf72ad579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f5e7e5ac EFLAGS: 00000206 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000005646 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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: [640][368] 128 vivid-000: S32 2 Element Array: [2] 2 vivid-000: S64 5 Element Array: [5] 4 vivid-000: Hotplug Present: 0x00000001 vivid-000: RxSense Present: 0x00000001 vivid-000: EDID Present: 0x00000001 vivid-000: Transmit Mode: HDMI vivid-000: Tx RGB Quantization Range: Automatic vivid-000: Enable Output Cropping: true vivid-000: Enable Output Composing: true vivid-000: Enable Output Scaler: true vivid-000: Wrap Sequence Number: false vivid-000: Wrap Timestamp: None vivid-000: Display Present: true inactive vivid-000: Percentage of Dropped Buffers: 0 vivid-000: ================== END STATUS ================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop