vivid-000: ================= START STATUS ================= vivid-000: Boolean: ====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc2-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/2803 is trying to acquire lock: ffff8881102906e0 (vivid_ctrls:1606:(hdl_user_gen)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_lock include/media/v4l2-ctrls.h:572 [inline] ffff8881102906e0 (vivid_ctrls:1606:(hdl_user_gen)->_lock){+.+.}-{3:3}, at: log_ctrl drivers/media/v4l2-core/v4l2-ctrls-core.c:2518 [inline] ffff8881102906e0 (vivid_ctrls:1606:(hdl_user_gen)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0xd3/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2556 but task is already holding lock: ffff888110294240 (vivid_ctrls:1634:(hdl_sdr_cap)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x5d/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2551 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (vivid_ctrls:1634:(hdl_sdr_cap)->_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x99/0x9a0 kernel/locking/mutex.c:752 find_ref_lock+0x20/0x100 drivers/media/v4l2-core/v4l2-ctrls-core.c:1647 handler_new_ref+0x6e/0x220 drivers/media/v4l2-core/v4l2-ctrls-core.c:1684 v4l2_ctrl_add_handler+0x8a/0xf0 drivers/media/v4l2-core/v4l2-ctrls-core.c:2208 vivid_create_controls+0x156c/0x1680 drivers/media/test-drivers/vivid/vivid-ctrls.c:1981 vivid_create_instance drivers/media/test-drivers/vivid/vivid-core.c:1854 [inline] vivid_probe+0xf61/0x1800 drivers/media/test-drivers/vivid/vivid-core.c:2018 platform_probe+0x91/0xc0 drivers/base/platform.c:1404 really_probe+0x133/0x450 drivers/base/dd.c:658 __driver_probe_device+0x77/0x140 drivers/base/dd.c:800 driver_probe_device+0x1e/0x1b0 drivers/base/dd.c:830 __driver_attach+0x11a/0x270 drivers/base/dd.c:1216 bus_for_each_dev+0x101/0x150 drivers/base/bus.c:368 bus_add_driver+0x164/0x270 drivers/base/bus.c:673 driver_register+0x5d/0xf0 drivers/base/driver.c:246 vivid_init+0x28/0x50 drivers/media/test-drivers/vivid/vivid-core.c:2145 do_one_initcall+0x134/0x320 init/main.c:1236 do_initcall_level+0x92/0x100 init/main.c:1298 do_initcalls+0x3a/0x70 init/main.c:1314 kernel_init_freeable+0x177/0x1e0 init/main.c:1551 kernel_init+0x15/0x190 init/main.c:1441 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 -> #0 (vivid_ctrls:1606:(hdl_user_gen)->_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+0x11fd/0x2490 kernel/locking/lockdep.c:5137 lock_acquire+0xea/0x270 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x99/0x9a0 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:2518 [inline] v4l2_ctrl_handler_log_status+0xd3/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2556 v4l2_ctrl_log_status+0x3a/0x50 drivers/media/v4l2-core/v4l2-ctrls-api.c:1206 vidioc_log_status+0x33/0x70 drivers/media/test-drivers/vivid/vivid-core.c:426 v4l_log_status+0x3c/0x80 drivers/media/v4l2-core/v4l2-ioctl.c:2562 __video_do_ioctl+0x360/0x470 drivers/media/v4l2-core/v4l2-ioctl.c:3049 video_usercopy+0x43a/0x720 drivers/media/v4l2-core/v4l2-ioctl.c:3390 v4l2_ioctl+0x42/0x60 drivers/media/v4l2-core/v4l2-dev.c:364 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0x6e/0xc0 fs/ioctl.c:857 do_syscall_64+0xa7/0x1c0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(vivid_ctrls:1634:(hdl_sdr_cap)->_lock); lock(vivid_ctrls:1606:(hdl_user_gen)->_lock); lock(vivid_ctrls:1634:(hdl_sdr_cap)->_lock); lock(vivid_ctrls:1606:(hdl_user_gen)->_lock); *** DEADLOCK *** 2 locks held by syz-executor.0/2803: #0: ffff888110295a08 (&dev->mutex#3){+.+.}-{3:3}, at: __video_do_ioctl+0x16a/0x470 drivers/media/v4l2-core/v4l2-ioctl.c:3017 #1: ffff888110294240 (vivid_ctrls:1634:(hdl_sdr_cap)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x5d/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2551 stack backtrace: CPU: 0 PID: 2803 Comm: syz-executor.0 Not tainted 6.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xe0 lib/dump_stack.c:106 check_noncircular+0x119/0x140 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+0x11fd/0x2490 kernel/locking/lockdep.c:5137 lock_acquire+0xea/0x270 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x99/0x9a0 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:2518 [inline] v4l2_ctrl_handler_log_status+0xd3/0x180 drivers/media/v4l2-core/v4l2-ctrls-core.c:2556 v4l2_ctrl_log_status+0x3a/0x50 drivers/media/v4l2-core/v4l2-ctrls-api.c:1206 vidioc_log_status+0x33/0x70 drivers/media/test-drivers/vivid/vivid-core.c:426 v4l_log_status+0x3c/0x80 drivers/media/v4l2-core/v4l2-ioctl.c:2562 __video_do_ioctl+0x360/0x470 drivers/media/v4l2-core/v4l2-ioctl.c:3049 video_usercopy+0x43a/0x720 drivers/media/v4l2-core/v4l2-ioctl.c:3390 v4l2_ioctl+0x42/0x60 drivers/media/v4l2-core/v4l2-dev.c:364 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0x6e/0xc0 fs/ioctl.c:857 do_syscall_64+0xa7/0x1c0 entry_SYSCALL_64_after_hwframe+0x6f/0x77 RIP: 0033:0x7f2414020da9 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:00007f2413ba20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f241414ef80 RCX: 00007f2414020da9 RDX: 0000000000000000 RSI: 0000000000005646 RDI: 0000000000000003 RBP: 00007f241406d47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f241414ef80 R15: 00007ffef800cea8 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: Wrap Sequence Number: false vivid-000: Wrap Timestamp: None vivid-000: Percentage of Dropped Buffers: 0 vivid-000: FM Deviation: 75000 vivid-000: ================== END STATUS ==================