se_dev->se_dev_ptr already set for storage object ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.2569/15401 is trying to acquire lock: ffff8881488ba4d0 (&sb->s_type->i_mutex_key#26){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] ffff8881488ba4d0 (&sb->s_type->i_mutex_key#26){++++}-{3:3}, at: configfs_depend_item_unlocked+0x157/0x430 fs/configfs/dir.c:1255 but task is already holding lock: ffffffff8de55e88 (tpg_instances_lock){+.+.}-{3:3}, at: usbg_make_tpg+0xf9/0x550 drivers/usb/gadget/function/f_tcm.c:1324 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (tpg_instances_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 tcm_alloc_inst+0x65/0x190 drivers/usb/gadget/function/f_tcm.c:2335 try_get_usb_function_instance drivers/usb/gadget/functions.c:28 [inline] usb_get_function_instance+0xdd/0x2e0 drivers/usb/gadget/functions.c:44 function_make+0x11c/0x350 drivers/usb/gadget/configfs.c:625 configfs_mkdir+0x515/0x9e0 fs/configfs/dir.c:1360 vfs_mkdir+0x2a5/0x470 fs/namei.c:4168 do_mkdirat+0x1dc/0x450 fs/namei.c:4191 __do_sys_mkdirat fs/namei.c:4206 [inline] __se_sys_mkdirat fs/namei.c:4204 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4204 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (func_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 try_get_usb_function_instance drivers/usb/gadget/functions.c:18 [inline] usb_get_function_instance+0x2e/0x2e0 drivers/usb/gadget/functions.c:44 function_make+0x11c/0x350 drivers/usb/gadget/configfs.c:625 configfs_mkdir+0x515/0x9e0 fs/configfs/dir.c:1360 vfs_mkdir+0x2a5/0x470 fs/namei.c:4168 do_mkdirat+0x1dc/0x450 fs/namei.c:4191 __do_sys_mkdirat fs/namei.c:4206 [inline] __se_sys_mkdirat fs/namei.c:4204 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4204 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (gadget_subsys.su_mutex){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 configfs_rmdir+0x63c/0x980 fs/configfs/dir.c:1556 vfs_rmdir+0x352/0x4b0 fs/namei.c:4251 do_rmdir+0x29f/0x590 fs/namei.c:4310 __do_sys_rmdir fs/namei.c:4329 [inline] __se_sys_rmdir fs/namei.c:4327 [inline] __x64_sys_rmdir+0x49/0x50 fs/namei.c:4327 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&sb->s_type->i_mutex_key#26){++++}-{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+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5756 down_write+0x97/0x200 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] configfs_depend_item_unlocked+0x157/0x430 fs/configfs/dir.c:1255 usbg_make_tpg+0x1e1/0x550 drivers/usb/gadget/function/f_tcm.c:1347 target_fabric_make_tpg+0xa4/0x6d0 drivers/target/target_core_fabric_configfs.c:947 configfs_mkdir+0x515/0x9e0 fs/configfs/dir.c:1360 vfs_mkdir+0x2a5/0x470 fs/namei.c:4168 do_mkdirat+0x1dc/0x450 fs/namei.c:4191 __do_sys_mkdirat fs/namei.c:4206 [inline] __se_sys_mkdirat fs/namei.c:4204 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4204 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#26 --> func_lock --> tpg_instances_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tpg_instances_lock); lock(func_lock); lock(tpg_instances_lock); lock(&sb->s_type->i_mutex_key#26); *** DEADLOCK *** 4 locks held by syz.5.2569/15401: #0: ffff8881442f2418 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412 #1: ffff888079423910 (&sb->s_type->i_mutex_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline] #1: ffff888079423910 (&sb->s_type->i_mutex_key#7/1){+.+.}-{3:3}, at: filename_create+0x20f/0x450 fs/namei.c:3937 #2: ffffffff8db2bdb0 (&subsys->su_mutex){+.+.}-{3:3}, at: configfs_mkdir+0x4b9/0x9e0 fs/configfs/dir.c:1358 #3: ffffffff8de55e88 (tpg_instances_lock){+.+.}-{3:3}, at: usbg_make_tpg+0xf9/0x550 drivers/usb/gadget/function/f_tcm.c:1324 stack backtrace: CPU: 0 PID: 15401 Comm: syz.5.2569 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 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+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5756 down_write+0x97/0x200 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] configfs_depend_item_unlocked+0x157/0x430 fs/configfs/dir.c:1255 usbg_make_tpg+0x1e1/0x550 drivers/usb/gadget/function/f_tcm.c:1347 target_fabric_make_tpg+0xa4/0x6d0 drivers/target/target_core_fabric_configfs.c:947 configfs_mkdir+0x515/0x9e0 fs/configfs/dir.c:1360 vfs_mkdir+0x2a5/0x470 fs/namei.c:4168 do_mkdirat+0x1dc/0x450 fs/namei.c:4191 __do_sys_mkdirat fs/namei.c:4206 [inline] __se_sys_mkdirat fs/namei.c:4204 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4204 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fca09d9e159 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:00007fca0ad04028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fca0a025fa0 RCX: 00007fca09d9e159 RDX: 00000000000001ff RSI: 0000200000000380 RDI: ffffffffffffff9c RBP: 00007fca09e3506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fca0a026038 R14: 00007fca0a025fa0 R15: 00007fff680679a8