====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.8.1389/12029 is trying to acquire lock: ffffffff8fc70680 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 drivers/usb/gadget/function/f_tcm.c:2734 but task is already holding lock: ffff888050f68390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 drivers/usb/gadget/configfs.c:439 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&gi->lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821 config_usb_cfg_link+0x59/0x260 drivers/usb/gadget/configfs.c:439 configfs_symlink+0x74e/0x11d0 fs/configfs/symlink.c:211 vfs_symlink+0x18b/0x330 fs/namei.c:5794 filename_symlinkat+0x1cd/0x410 fs/namei.c:5819 __do_sys_symlinkat fs/namei.c:5839 [inline] __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5834 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: down_write+0x96/0x200 kernel/locking/rwsem.c:1631 inode_lock include/linux/fs.h:1024 [inline] configfs_depend_item_unlocked+0x153/0x420 fs/configfs/dir.c:1268 usbg_make_tpg+0x1e0/0x550 drivers/usb/gadget/function/f_tcm.c:1692 target_fabric_make_tpg+0xa8/0x6d0 drivers/target/target_core_fabric_configfs.c:947 configfs_mkdir+0x4f6/0x9e0 fs/configfs/dir.c:1369 vfs_mkdir+0x40c/0x620 fs/namei.c:5410 filename_mkdirat+0x285/0x510 fs/namei.c:5443 __do_sys_mkdirat fs/namei.c:5464 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5461 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (tpg_instances_lock){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821 tcm_alloc+0x21/0x2e0 drivers/usb/gadget/function/f_tcm.c:2734 usb_get_function+0x63/0xb0 drivers/usb/gadget/functions.c:61 config_usb_cfg_link+0x148/0x260 drivers/usb/gadget/configfs.c:469 configfs_symlink+0x74e/0x11d0 fs/configfs/symlink.c:211 vfs_symlink+0x18b/0x330 fs/namei.c:5794 filename_symlinkat+0x1cd/0x410 fs/namei.c:5819 __do_sys_symlinkat fs/namei.c:5839 [inline] __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5834 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&gi->lock); lock(&sb->s_type->i_mutex_key#24); lock(&gi->lock); lock(tpg_instances_lock); *** DEADLOCK *** locks held by syz.8.1389/12029: 3, last CPU#0: #0: ffff88801d7ea460 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494 #1: ffff8880792a8140 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline] #1: ffff8880792a8140 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x4d0/0x11d0 fs/configfs/symlink.c:201 #2: ffff888050f68390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 drivers/usb/gadget/configfs.c:439 stack backtrace: CPU: 0 UID: 0 PID: 12029 Comm: syz.8.1389 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219 check_prev_add kernel/locking/lockdep.c:3209 [inline] check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x19d/0x1550 kernel/locking/mutex.c:821 tcm_alloc+0x21/0x2e0 drivers/usb/gadget/function/f_tcm.c:2734 usb_get_function+0x63/0xb0 drivers/usb/gadget/functions.c:61 config_usb_cfg_link+0x148/0x260 drivers/usb/gadget/configfs.c:469 configfs_symlink+0x74e/0x11d0 fs/configfs/symlink.c:211 vfs_symlink+0x18b/0x330 fs/namei.c:5794 filename_symlinkat+0x1cd/0x410 fs/namei.c:5819 __do_sys_symlinkat fs/namei.c:5839 [inline] __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5834 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe0b579e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe0b66f3028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007fe0b5a26090 RCX: 00007fe0b579e159 RDX: 0000200000000600 RSI: ffffffffffffff9c RDI: 00002000000005c0 RBP: 00007fe0b583506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe0b5a26128 R14: 00007fe0b5a26090 R15: 00007fff108e8558