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) symlinkat(&(0x7f0000000980)='./config/usb_gadget/g1/functions/tcm.0\x00', 0xffffffffffffff9c, &(0x7f00000009c0)='./config/usb_gadget/g1/configs/c.1/tcm.0\x00') r5 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/enable\x00', 0x2, 0x0) write(r5, &(0x7f0000000a40)='1\x00', 0x1) 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}) [ 84.321720][ T5329] se_device not configured yet, cannot port link [ 84.326354][ T5329] [ 84.327315][ T5329] ====================================================== [ 84.329982][ T5329] WARNING: possible circular locking dependency detected [ 84.332494][ T5329] syzkaller #0 Not tainted [ 84.334105][ T5329] ------------------------------------------------------ [ 84.336453][ T5329] syz.0.0/5329 is trying to acquire lock: [ 84.338673][ T5329] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 84.341820][ T5329] [ 84.341820][ T5329] but task is already holding lock: [ 84.344314][ T5329] ffff888040282390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 84.347439][ T5329] [ 84.347439][ T5329] which lock already depends on the new lock. [ 84.347439][ T5329] [ 84.353562][ T5329] [ 84.353562][ T5329] the existing dependency chain (in reverse order) is: [ 84.356576][ T5329] [ 84.356576][ T5329] -> #3 (&gi->lock){+.+.}-{4:4}: [ 84.358957][ T5329] __mutex_lock+0x19d/0x1550 [ 84.360694][ T5329] config_usb_cfg_link+0x59/0x260 [ 84.362518][ T5329] configfs_symlink+0x59a/0x1030 [ 84.364312][ T5329] vfs_symlink+0x18b/0x330 [ 84.365989][ T5329] filename_symlinkat+0x1cd/0x410 [ 84.367904][ T5329] __se_sys_symlinkat+0x4e/0x2b0 [ 84.369817][ T5329] do_syscall_64+0x174/0x580 [ 84.371660][ T5329] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.373894][ T5329] [ 84.373894][ T5329] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 84.377065][ T5329] down_write+0x96/0x200 [ 84.378648][ T5329] configfs_depend_item_unlocked+0x153/0x420 [ 84.380847][ T5329] usbg_make_tpg+0x1f6/0x590 [ 84.382582][ T5329] target_fabric_make_tpg+0xa8/0x6d0 [ 84.384525][ T5329] configfs_mkdir+0x4f6/0x9e0 [ 84.386293][ T5329] vfs_mkdir+0x406/0x620 [ 84.387905][ T5329] filename_mkdirat+0x285/0x510 [ 84.389749][ T5329] __se_sys_mkdirat+0x35/0x150 [ 84.391538][ T5329] do_syscall_64+0x174/0x580 [ 84.393249][ T5329] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.395417][ T5329] [ 84.395417][ T5329] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 84.397911][ T5329] __mutex_lock+0x19d/0x1550 [ 84.399563][ T5329] usbg_make_tpg+0x147/0x590 [ 84.401342][ T5329] target_fabric_make_tpg+0xa8/0x6d0 [ 84.403303][ T5329] configfs_mkdir+0x4f6/0x9e0 [ 84.405091][ T5329] vfs_mkdir+0x406/0x620 [ 84.406789][ T5329] filename_mkdirat+0x285/0x510 [ 84.408651][ T5329] __se_sys_mkdirat+0x35/0x150 [ 84.410428][ T5329] do_syscall_64+0x174/0x580 [ 84.412124][ T5329] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.414274][ T5329] [ 84.414274][ T5329] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 84.416860][ T5329] __lock_acquire+0x1520/0x2cf0 [ 84.418668][ T5329] lock_acquire+0x106/0x350 [ 84.420376][ T5329] __mutex_lock+0x19d/0x1550 [ 84.422100][ T5329] tcm_alloc+0x21/0x2e0 [ 84.423707][ T5329] usb_get_function+0x63/0xb0 [ 84.425455][ T5329] config_usb_cfg_link+0x148/0x260 [ 84.427326][ T5329] configfs_symlink+0x59a/0x1030 [ 84.429104][ T5329] vfs_symlink+0x18b/0x330 [ 84.430795][ T5329] filename_symlinkat+0x1cd/0x410 [ 84.432750][ T5329] __se_sys_symlinkat+0x4e/0x2b0 [ 84.434842][ T5329] do_syscall_64+0x174/0x580 [ 84.436741][ T5329] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.439063][ T5329] [ 84.439063][ T5329] other info that might help us debug this: [ 84.439063][ T5329] [ 84.442518][ T5329] Chain exists of: [ 84.442518][ T5329] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 84.442518][ T5329] [ 84.447062][ T5329] Possible unsafe locking scenario: [ 84.447062][ T5329] [ 84.449528][ T5329] CPU0 CPU1 [ 84.451378][ T5329] ---- ---- [ 84.453190][ T5329] lock(&gi->lock); [ 84.454584][ T5329] lock(&sb->s_type->i_mutex_key#24); [ 84.457360][ T5329] lock(&gi->lock); [ 84.459758][ T5329] lock(tpg_instances_lock); [ 84.461416][ T5329] [ 84.461416][ T5329] *** DEADLOCK *** [ 84.461416][ T5329] [ 84.464087][ T5329] 3 locks held by syz.0.0/5329: [ 84.465719][ T5329] #0: ffff888000306450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 84.468689][ T5329] #1: ffff88801f9c1440 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 84.472255][ T5329] #2: ffff888040282390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 84.475454][ T5329] [ 84.475454][ T5329] stack backtrace: [ 84.477505][ T5329] CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 84.477515][ T5329] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 84.477520][ T5329] Call Trace: [ 84.477526][ T5329] [ 84.477529][ T5329] dump_stack_lvl+0xe8/0x150 [ 84.477544][ T5329] print_circular_bug+0x2e1/0x300 [ 84.477556][ T5329] check_noncircular+0x12e/0x150 [ 84.477565][ T5329] __lock_acquire+0x1520/0x2cf0 [ 84.477580][ T5329] ? __lock_acquire+0x13e8/0x2cf0 [ 84.477590][ T5329] ? __pfx_stack_trace_save+0x10/0x10 [ 84.477601][ T5329] ? tcm_alloc+0x21/0x2e0 [ 84.477610][ T5329] lock_acquire+0x106/0x350 [ 84.477650][ T5329] ? tcm_alloc+0x21/0x2e0 [ 84.477662][ T5329] __mutex_lock+0x19d/0x1550 [ 84.477674][ T5329] ? tcm_alloc+0x21/0x2e0 [ 84.477682][ T5329] ? trace_contention_end+0x3d/0x140 [ 84.477690][ T5329] ? __mutex_lock+0x30d/0x1550 [ 84.477699][ T5329] ? tcm_alloc+0x21/0x2e0 [ 84.477707][ T5329] ? __pfx___mutex_lock+0x10/0x10 [ 84.477716][ T5329] ? __pfx___mutex_lock+0x10/0x10 [ 84.477727][ T5329] tcm_alloc+0x21/0x2e0 [ 84.477735][ T5329] usb_get_function+0x63/0xb0 [ 84.477743][ T5329] config_usb_cfg_link+0x148/0x260 [ 84.477753][ T5329] configfs_symlink+0x59a/0x1030 [ 84.477760][ T5329] ? lookup_one_qstr_excl+0x1d4/0x360 [ 84.477770][ T5329] ? make_vfsuid+0x49/0xa0 [ 84.477778][ T5329] ? __pfx_configfs_symlink+0x10/0x10 [ 84.477787][ T5329] ? bpf_lsm_inode_symlink+0x9/0x20 [ 84.477798][ T5329] vfs_symlink+0x18b/0x330 [ 84.477805][ T5329] ? security_path_symlink+0xfd/0x360 [ 84.477813][ T5329] filename_symlinkat+0x1cd/0x410 [ 84.477821][ T5329] ? __pfx_filename_symlinkat+0x10/0x10 [ 84.477828][ T5329] ? do_getname+0x151/0x250 [ 84.477835][ T5329] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.477843][ T5329] __se_sys_symlinkat+0x4e/0x2b0 [ 84.477849][ T5329] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.477856][ T5329] do_syscall_64+0x174/0x580 [ 84.477865][ T5329] ? trace_irq_disable+0x3b/0x140 [ 84.477875][ T5329] ? clear_bhb_loop+0x40/0x90 [ 84.477883][ T5329] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 84.477891][ T5329] RIP: 0033:0x7f3b2539e019 [ 84.477900][ T5329] 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 [ 84.477906][ T5329] RSP: 002b:00007f3b2622bfe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 84.477914][ T5329] RAX: ffffffffffffffda RBX: 00007f3b25625fa0 RCX: 00007f3b2539e019 [ 84.477920][ T5329] RDX: 00002000000009c0 RSI: ffffffffffffff9c RDI: 0000200000000980 [ 84.477925][ T5329] RBP: 00007f3b2543500c R08: 0000000000000000 R09: 0000000000000000 [ 84.477932][ T5329] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 84.477938][ T5329] R13: 00007f3b25626038 R14: 00007f3b25625fa0 R15: 00007ffe485c8758 [ 84.477948][ T5329] [ 84.587075][ T24] audit: type=1800 audit(1785849670.589:2): pid=5329 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4247 res=0 errno=0 [ 84.593637][ T5289] Bluetooth: hci0: command tx timeout [ 84.606771][ T24] audit: type=1800 audit(1785849670.589:3): pid=5329 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4254 res=0 errno=0 [ 84.618637][ T24] audit: type=1800 audit(1785849670.589:4): pid=5329 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4255 res=0 errno=0 [ 84.625484][ T24] audit: type=1800 audit(1785849670.599:5): pid=5329 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4276 res=0 errno=0 [ 84.632778][ T24] audit: type=1800 audit(1785849670.859:6): pid=5329 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4278 res=0 errno=0 [ 84.639982][ T24] audit: type=1800 audit(1785849670.859:7): pid=5329 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4279 res=0 errno=0 [ 84.887235][ T5327] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 85.038564][ T5327] usb 5-1: Dual-Role OTG device on HNP port [ 85.041519][ T5327] usb 5-1: New USB device found, idVendor=1d6b, idProduct=0104, bcdDevice= 7.02 [ 85.045398][ T5327] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 85.058230][ T2001] Using the BOT protocol [ 85.068019][ T2001] Using the UAS protocol [ 85.075127][ T5327] scsi host6: uas