program: mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./config\x00', 0x1ff) mount(0x0, &(0x7f00000000c0)='./config\x00', &(0x7f0000000180)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/target\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000240)='./config/target/core\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000280)='./config/target/core/rd_mcp_0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000002c0)='./config/target/core/rd_mcp_0/rd1\x00', 0x1ff) r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./config/target/core/rd_mcp_0/rd1/control\x00', 0x2, 0x0) write(r0, &(0x7f0000000380)='rd_pages=32768\x00', 0xe) r1 = openat(0xffffffffffffff9c, &(0x7f00000003c0)='./config/target/core/rd_mcp_0/rd1/enable\x00', 0x2, 0x0) write(r1, &(0x7f0000000400)='1\x00', 0x1) mkdirat(0xffffffffffffff9c, &(0x7f0000000440)='./config/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000480)='./config/usb_gadget/g1\x00', 0x1ff) r2 = openat(0xffffffffffffff9c, &(0x7f00000004c0)='./config/usb_gadget/g1/idVendor\x00', 0x2, 0x0) write(r2, &(0x7f0000000500)='0x1d6b\x00', 0x6) r3 = openat(0xffffffffffffff9c, &(0x7f0000000540)='./config/usb_gadget/g1/idProduct\x00', 0x2, 0x0) write(r3, &(0x7f0000000580)='0x0104\x00', 0x6) mkdirat(0xffffffffffffff9c, &(0x7f00000005c0)='./config/usb_gadget/g1/functions\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000600)='./config/usb_gadget/g1/functions/tcm.0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000640)='./config/usb_gadget/g1/configs\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000680)='./config/usb_gadget/g1/configs/c.1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000006c0)='./config/target/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000700)='./config/target/usb_gadget/naa.6001405123456789\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000740)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000780)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000007c0)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0\x00', 0x1ff) symlinkat(&(0x7f0000000840)='./config/target/core/rd_mcp_0/rd1\x00', 0xffffffffffffff9c, &(0x7f0000000880)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0/rd1\x00') r4 = openat(0xffffffffffffff9c, &(0x7f0000000900)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/nexus\x00', 0x2, 0x0) write(r4, &(0x7f0000000940)='naa.6001405123456789\x00', 0x14) r5 = openat(0xffffffffffffff9c, &(0x7f0000000980)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/enable\x00', 0x2, 0x0) write(r5, &(0x7f00000009c0)='1\x00', 0x1) symlinkat(&(0x7f0000000a00)='./config/usb_gadget/g1/functions/tcm.0\x00', 0xffffffffffffff9c, &(0x7f0000000a40)='./config/usb_gadget/g1/configs/c.1/tcm.0\x00') r6 = openat(0xffffffffffffff9c, &(0x7f0000000a80)='./config/usb_gadget/g1/UDC\x00', 0x2, 0x0) write(r6, &(0x7f0000000ac0)='dummy_udc.0\x00', 0xb) nanosleep(&(0x7f0000000000)={0x1}, 0x0) r7 = syz_open_dev$sg(0x0, 0x0, 0x0) ioctl$SG_IO(r7, 0x2285, &(0x7f0000000100)={0x53, 0xfffffffe, 0xa, 0x0, @buffer={0x0, 0x1c, &(0x7f0000000200)=""/28}, &(0x7f0000000300)="5f000000000000001c00", &(0x7f0000000400), 0x0, 0x0, 0x0, 0x0}) [ 87.138364][ T24] audit: type=1800 audit(1785849046.594:2): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4243 res=0 errno=0 [ 87.164327][ T24] audit: type=1800 audit(1785849046.614:3): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4250 res=0 errno=0 [ 87.178409][ T5320] se_device not configured yet, cannot port link [ 87.181558][ T24] audit: type=1800 audit(1785849046.614:4): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4251 res=0 errno=0 [ 87.196158][ T5320] [ 87.197289][ T5320] ====================================================== [ 87.200253][ T5320] WARNING: possible circular locking dependency detected [ 87.203228][ T5320] syzkaller #0 Not tainted [ 87.205157][ T5320] ------------------------------------------------------ [ 87.208078][ T5320] syz.0.0/5320 is trying to acquire lock: [ 87.210485][ T5320] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 87.214339][ T5320] [ 87.214339][ T5320] but task is already holding lock: [ 87.217445][ T5320] ffff888034b76390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 87.221218][ T5320] [ 87.221218][ T5320] which lock already depends on the new lock. [ 87.221218][ T5320] [ 87.225480][ T5320] [ 87.225480][ T5320] the existing dependency chain (in reverse order) is: [ 87.228785][ T5320] [ 87.228785][ T5320] -> #3 (&gi->lock){+.+.}-{4:4}: [ 87.231185][ T5320] __mutex_lock+0x19d/0x1550 [ 87.232989][ T5320] config_usb_cfg_link+0x59/0x260 [ 87.234952][ T5320] configfs_symlink+0x59a/0x1030 [ 87.237242][ T5320] vfs_symlink+0x18b/0x330 [ 87.239257][ T5320] filename_symlinkat+0x1cd/0x410 [ 87.241451][ T5320] __se_sys_symlinkat+0x4e/0x2b0 [ 87.243590][ T5320] do_syscall_64+0x174/0x580 [ 87.245534][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.247985][ T5320] [ 87.247985][ T5320] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 87.251259][ T5320] down_write+0x96/0x200 [ 87.252952][ T5320] configfs_depend_item_unlocked+0x153/0x420 [ 87.255381][ T5320] usbg_make_tpg+0x1f6/0x590 [ 87.257359][ T5320] target_fabric_make_tpg+0xa8/0x6d0 [ 87.259511][ T5320] configfs_mkdir+0x4f6/0x9e0 [ 87.261314][ T5320] vfs_mkdir+0x406/0x620 [ 87.263012][ T5320] filename_mkdirat+0x285/0x510 [ 87.265109][ T5320] __se_sys_mkdirat+0x35/0x150 [ 87.267111][ T5320] do_syscall_64+0x174/0x580 [ 87.268972][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.271440][ T5320] [ 87.271440][ T5320] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 87.274345][ T5320] __mutex_lock+0x19d/0x1550 [ 87.276355][ T5320] usbg_make_tpg+0x147/0x590 [ 87.278310][ T5320] target_fabric_make_tpg+0xa8/0x6d0 [ 87.280586][ T5320] configfs_mkdir+0x4f6/0x9e0 [ 87.282678][ T5320] vfs_mkdir+0x406/0x620 [ 87.284603][ T5320] filename_mkdirat+0x285/0x510 [ 87.286917][ T5320] __se_sys_mkdirat+0x35/0x150 [ 87.289068][ T5320] do_syscall_64+0x174/0x580 [ 87.291215][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.293887][ T5320] [ 87.293887][ T5320] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 87.297224][ T5320] __lock_acquire+0x1520/0x2cf0 [ 87.299482][ T5320] lock_acquire+0x106/0x350 [ 87.301439][ T5320] __mutex_lock+0x19d/0x1550 [ 87.303342][ T5320] tcm_alloc+0x21/0x2e0 [ 87.305096][ T5320] usb_get_function+0x63/0xb0 [ 87.307027][ T5320] config_usb_cfg_link+0x148/0x260 [ 87.309211][ T5320] configfs_symlink+0x59a/0x1030 [ 87.311337][ T5320] vfs_symlink+0x18b/0x330 [ 87.313292][ T5320] filename_symlinkat+0x1cd/0x410 [ 87.315470][ T5320] __se_sys_symlinkat+0x4e/0x2b0 [ 87.317646][ T5320] do_syscall_64+0x174/0x580 [ 87.319802][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.322638][ T5320] [ 87.322638][ T5320] other info that might help us debug this: [ 87.322638][ T5320] [ 87.326353][ T5320] Chain exists of: [ 87.326353][ T5320] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 87.326353][ T5320] [ 87.331144][ T5320] Possible unsafe locking scenario: [ 87.331144][ T5320] [ 87.333925][ T5320] CPU0 CPU1 [ 87.336047][ T5320] ---- ---- [ 87.337923][ T5320] lock(&gi->lock); [ 87.339373][ T5320] lock(&sb->s_type->i_mutex_key#24); [ 87.342186][ T5320] lock(&gi->lock); [ 87.344366][ T5320] lock(tpg_instances_lock); [ 87.346128][ T5320] [ 87.346128][ T5320] *** DEADLOCK *** [ 87.346128][ T5320] [ 87.349132][ T5320] 3 locks held by syz.0.0/5320: [ 87.350955][ T5320] #0: ffff88800034e450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 87.354342][ T5320] #1: ffff888043eaa280 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 87.358316][ T5320] #2: ffff888034b76390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 87.361734][ T5320] [ 87.361734][ T5320] stack backtrace: [ 87.363910][ T5320] CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 87.363925][ T5320] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 87.363930][ T5320] Call Trace: [ 87.363935][ T5320] [ 87.363938][ T5320] dump_stack_lvl+0xe8/0x150 [ 87.363952][ T5320] print_circular_bug+0x2e1/0x300 [ 87.363962][ T5320] check_noncircular+0x12e/0x150 [ 87.363970][ T5320] __lock_acquire+0x1520/0x2cf0 [ 87.363982][ T5320] ? __lock_acquire+0x13e8/0x2cf0 [ 87.363993][ T5320] ? __pfx_stack_trace_save+0x10/0x10 [ 87.364005][ T5320] ? tcm_alloc+0x21/0x2e0 [ 87.364013][ T5320] lock_acquire+0x106/0x350 [ 87.364024][ T5320] ? tcm_alloc+0x21/0x2e0 [ 87.364033][ T5320] __mutex_lock+0x19d/0x1550 [ 87.364046][ T5320] ? tcm_alloc+0x21/0x2e0 [ 87.364058][ T5320] ? trace_contention_end+0x3d/0x140 [ 87.364070][ T5320] ? __mutex_lock+0x30d/0x1550 [ 87.364082][ T5320] ? tcm_alloc+0x21/0x2e0 [ 87.364094][ T5320] ? __pfx___mutex_lock+0x10/0x10 [ 87.364109][ T5320] ? __pfx___mutex_lock+0x10/0x10 [ 87.364124][ T5320] tcm_alloc+0x21/0x2e0 [ 87.364137][ T5320] usb_get_function+0x63/0xb0 [ 87.364146][ T5320] config_usb_cfg_link+0x148/0x260 [ 87.364155][ T5320] configfs_symlink+0x59a/0x1030 [ 87.364163][ T5320] ? lookup_one_qstr_excl+0x1d4/0x360 [ 87.364172][ T5320] ? make_vfsuid+0x49/0xa0 [ 87.364180][ T5320] ? __pfx_configfs_symlink+0x10/0x10 [ 87.364187][ T5320] ? bpf_lsm_inode_symlink+0x9/0x20 [ 87.364198][ T5320] vfs_symlink+0x18b/0x330 [ 87.364204][ T5320] ? security_path_symlink+0xfd/0x360 [ 87.364213][ T5320] filename_symlinkat+0x1cd/0x410 [ 87.364220][ T5320] ? __pfx_filename_symlinkat+0x10/0x10 [ 87.364227][ T5320] ? do_getname+0x151/0x250 [ 87.364236][ T5320] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.364247][ T5320] __se_sys_symlinkat+0x4e/0x2b0 [ 87.364258][ T5320] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.364267][ T5320] do_syscall_64+0x174/0x580 [ 87.364281][ T5320] ? clear_bhb_loop+0x40/0x90 [ 87.364293][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.364304][ T5320] RIP: 0033:0x7fc3eaf9e019 [ 87.364316][ T5320] 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 [ 87.364325][ T5320] RSP: 002b:00007fc3ebe28fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 87.364334][ T5320] RAX: ffffffffffffffda RBX: 00007fc3eb225fa0 RCX: 00007fc3eaf9e019 [ 87.364339][ T5320] RDX: 0000200000000a40 RSI: ffffffffffffff9c RDI: 0000200000000a00 [ 87.364344][ T5320] RBP: 00007fc3eb03500c R08: 0000000000000000 R09: 0000000000000000 [ 87.364348][ T5320] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 87.364352][ T5320] R13: 00007fc3eb226038 R14: 00007fc3eb225fa0 R15: 00007ffcc5f3de38 [ 87.364359][ T5320] [ 87.479190][ T24] audit: type=1800 audit(1785849046.654:5): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4272 res=0 errno=0 [ 87.486193][ T24] audit: type=1800 audit(1785849046.654:6): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4273 res=0 errno=0 [ 87.493823][ T4649] Bluetooth: hci0: command tx timeout [ 87.516028][ T24] audit: type=1800 audit(1785849046.974:7): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4278 res=0 errno=0 [ 87.759420][ T1395] usb 5-1: new high-speed USB device number 2 using dummy_hcd