Hello, syzbot found the following issue on: HEAD commit: b1d3a0e70c38 Add linux-next specific files for 20240208 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=105d3360180000 kernel config: https://syzkaller.appspot.com/x/.config?x=bb693ba195662a06 dashboard link: https://syzkaller.appspot.com/bug?extid=9948f8e188482c5d1a3e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=148953c4180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1746f9b7e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/176a6b395bbe/disk-b1d3a0e7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/02d7d46f81bd/vmlinux-b1d3a0e7.xz kernel image: https://storage.googleapis.com/syzbot-assets/18a5a5030e19/bzImage-b1d3a0e7.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9948f8e188482c5d1a3e@xxxxxxxxxxxxxxxxxxxxxxxxx vivid-000: ================= START STATUS ================= vivid-000: Boolean: ====================================================== WARNING: possible circular locking dependency detected 6.8.0-rc3-next-20240208-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor190/5068 is trying to acquire lock: ffff8880253306e0 (vivid_ctrls:1606:(hdl_user_gen)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_lock include/media/v4l2-ctrls.h:572 [inline] ffff8880253306e0 (vivid_ctrls:1606:(hdl_user_gen)->_lock){+.+.}-{3:3}, at: log_ctrl drivers/media/v4l2-core/v4l2-ctrls-core.c:2518 [inline] ffff8880253306e0 (vivid_ctrls:1606:(hdl_user_gen)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x2f3/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2556 but task is already holding lock: ffff888025334278 (vivid_ctrls:1634:(hdl_sdr_cap)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x11f/0x540 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}: lock_acquire+0x1e4/0x530 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:1647 handler_new_ref+0x102/0x940 drivers/media/v4l2-core/v4l2-ctrls-core.c:1684 v4l2_ctrl_add_handler+0x1a1/0x290 drivers/media/v4l2-core/v4l2-ctrls-core.c:2208 vivid_create_controls+0x2b3c/0x3580 drivers/media/test-drivers/vivid/vivid-ctrls.c:1981 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+0x29e/0xc50 drivers/base/dd.c:658 __driver_probe_device+0x1a2/0x3e0 drivers/base/dd.c:800 driver_probe_device+0x50/0x430 drivers/base/dd.c:830 __driver_attach+0x45f/0x710 drivers/base/dd.c:1216 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+0x238/0x830 init/main.c:1233 do_initcall_level+0x157/0x210 init/main.c:1295 do_initcalls+0x3f/0x80 init/main.c:1311 kernel_init_freeable+0x430/0x5d0 init/main.c:1542 kernel_init+0x1d/0x2b0 init/main.c:1432 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1e4/0x530 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:2518 [inline] v4l2_ctrl_handler_log_status+0x2f3/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2556 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 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:857 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 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-executor190/5068: #0: ffff888025335a58 (&dev->mutex#3){+.+.}-{3:3}, at: __video_do_ioctl+0x4ed/0xde0 drivers/media/v4l2-core/v4l2-ioctl.c:3017 #1: ffff888025334278 (vivid_ctrls:1634:(hdl_sdr_cap)->_lock){+.+.}-{3:3}, at: v4l2_ctrl_handler_log_status+0x11f/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2551 stack backtrace: CPU: 0 PID: 5068 Comm: syz-executor190 Not tainted 6.8.0-rc3-next-20240208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: <TASK> __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+0x1e4/0x530 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:2518 [inline] v4l2_ctrl_handler_log_status+0x2f3/0x540 drivers/media/v4l2-core/v4l2-ctrls-core.c:2556 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 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:857 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fc7060250e9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff130f5498 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fff130f5668 RCX: 00007fc7060250e9 RDX: 0000000000000000 RSI: 0000000000005646 RDI: 0000000000000003 RBP: 00007fc706098610 R08: 00236f6964617277 R09: 00007fff130f5668 R10: 000000000000000f R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff130f5658 R14: 0000000000000001 R15: 0000000000000001 </TASK> 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 ======== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
