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$sg(&(0x7f0000000b00), 0x0, 0x0) ioctl$SG_IO(r7, 0x2285, &(0x7f0000000100)={0x53, 0xfffffffe, 0xa, 0x0, @buffer={0x0, 0x1c, &(0x7f0000000200)=""/28}, &(0x7f0000000300)="5f000000000000001c00", &(0x7f0000000400), 0x0, 0x0, 0x0, 0x0}) [ 85.844110][ T4649] Bluetooth: hci0: command tx timeout [ 85.963510][ T24] audit: type=1800 audit(1785849837.339:2): pid=5323 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4252 res=0 errno=0 [ 85.980325][ T24] audit: type=1800 audit(1785849837.359:3): pid=5323 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4259 res=0 errno=0 [ 85.994629][ T5323] se_device not configured yet, cannot port link [ 85.998032][ T24] audit: type=1800 audit(1785849837.359:4): pid=5323 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4260 res=0 errno=0 [ 86.010122][ T5323] [ 86.011117][ T5323] ====================================================== [ 86.013641][ T5323] WARNING: possible circular locking dependency detected [ 86.016220][ T5323] syzkaller #0 Not tainted [ 86.017804][ T5323] ------------------------------------------------------ [ 86.020328][ T5323] syz.0.0/5323 is trying to acquire lock: [ 86.022434][ T5323] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 86.025758][ T5323] [ 86.025758][ T5323] but task is already holding lock: [ 86.028806][ T5323] ffff88801324c390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 86.032398][ T5323] [ 86.032398][ T5323] which lock already depends on the new lock. [ 86.032398][ T5323] [ 86.036557][ T5323] [ 86.036557][ T5323] the existing dependency chain (in reverse order) is: [ 86.040058][ T5323] [ 86.040058][ T5323] -> #3 (&gi->lock){+.+.}-{4:4}: [ 86.042863][ T5323] __mutex_lock+0x19d/0x1550 [ 86.044880][ T5323] config_usb_cfg_link+0x59/0x260 [ 86.047103][ T5323] configfs_symlink+0x59a/0x1030 [ 86.049260][ T5323] vfs_symlink+0x18b/0x330 [ 86.051376][ T5323] filename_symlinkat+0x1cd/0x410 [ 86.053730][ T5323] __se_sys_symlinkat+0x4e/0x2b0 [ 86.055939][ T5323] do_syscall_64+0x174/0x580 [ 86.058086][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.060786][ T5323] [ 86.060786][ T5323] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 86.064570][ T5323] down_write+0x96/0x200 [ 86.066551][ T5323] configfs_depend_item_unlocked+0x153/0x420 [ 86.069240][ T5323] usbg_make_tpg+0x1f6/0x590 [ 86.071548][ T5323] target_fabric_make_tpg+0xa8/0x6d0 [ 86.074533][ T5323] configfs_mkdir+0x4f6/0x9e0 [ 86.076637][ T5323] vfs_mkdir+0x406/0x620 [ 86.078499][ T5323] filename_mkdirat+0x285/0x510 [ 86.080496][ T5323] __se_sys_mkdirat+0x35/0x150 [ 86.082216][ T5323] do_syscall_64+0x174/0x580 [ 86.083900][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.086039][ T5323] [ 86.086039][ T5323] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 86.088874][ T5323] __mutex_lock+0x19d/0x1550 [ 86.090734][ T5323] usbg_make_tpg+0x147/0x590 [ 86.092586][ T5323] target_fabric_make_tpg+0xa8/0x6d0 [ 86.094537][ T5323] configfs_mkdir+0x4f6/0x9e0 [ 86.096630][ T5323] vfs_mkdir+0x406/0x620 [ 86.098514][ T5323] filename_mkdirat+0x285/0x510 [ 86.100651][ T5323] __se_sys_mkdirat+0x35/0x150 [ 86.102756][ T5323] do_syscall_64+0x174/0x580 [ 86.104490][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.106655][ T5323] [ 86.106655][ T5323] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 86.109467][ T5323] __lock_acquire+0x1520/0x2cf0 [ 86.111656][ T5323] lock_acquire+0x106/0x350 [ 86.113575][ T5323] __mutex_lock+0x19d/0x1550 [ 86.115636][ T5323] tcm_alloc+0x21/0x2e0 [ 86.117658][ T5323] usb_get_function+0x63/0xb0 [ 86.119865][ T5323] config_usb_cfg_link+0x148/0x260 [ 86.122213][ T5323] configfs_symlink+0x59a/0x1030 [ 86.124456][ T5323] vfs_symlink+0x18b/0x330 [ 86.126502][ T5323] filename_symlinkat+0x1cd/0x410 [ 86.128876][ T5323] __se_sys_symlinkat+0x4e/0x2b0 [ 86.131193][ T5323] do_syscall_64+0x174/0x580 [ 86.132996][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.135476][ T5323] [ 86.135476][ T5323] other info that might help us debug this: [ 86.135476][ T5323] [ 86.138979][ T5323] Chain exists of: [ 86.138979][ T5323] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 86.138979][ T5323] [ 86.143428][ T5323] Possible unsafe locking scenario: [ 86.143428][ T5323] [ 86.146175][ T5323] CPU0 CPU1 [ 86.148212][ T5323] ---- ---- [ 86.150281][ T5323] lock(&gi->lock); [ 86.151939][ T5323] lock(&sb->s_type->i_mutex_key#24); [ 86.155091][ T5323] lock(&gi->lock); [ 86.157563][ T5323] lock(tpg_instances_lock); [ 86.159451][ T5323] [ 86.159451][ T5323] *** DEADLOCK *** [ 86.159451][ T5323] [ 86.162729][ T5323] 3 locks held by syz.0.0/5323: [ 86.164747][ T5323] #0: ffff888031a8e450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 86.167959][ T5323] #1: ffff888041cc5900 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 86.171550][ T5323] #2: ffff88801324c390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 86.174637][ T5323] [ 86.174637][ T5323] stack backtrace: [ 86.176716][ T5323] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 86.176727][ T5323] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 86.176733][ T5323] Call Trace: [ 86.176737][ T5323] [ 86.176741][ T5323] dump_stack_lvl+0xe8/0x150 [ 86.176761][ T5323] print_circular_bug+0x2e1/0x300 [ 86.176775][ T5323] check_noncircular+0x12e/0x150 [ 86.176794][ T5323] __lock_acquire+0x1520/0x2cf0 [ 86.176812][ T5323] ? __lock_acquire+0x13e8/0x2cf0 [ 86.176829][ T5323] ? __pfx_stack_trace_save+0x10/0x10 [ 86.176841][ T5323] ? tcm_alloc+0x21/0x2e0 [ 86.176850][ T5323] lock_acquire+0x106/0x350 [ 86.176860][ T5323] ? tcm_alloc+0x21/0x2e0 [ 86.176870][ T5323] __mutex_lock+0x19d/0x1550 [ 86.176880][ T5323] ? tcm_alloc+0x21/0x2e0 [ 86.176888][ T5323] ? trace_contention_end+0x3d/0x140 [ 86.176896][ T5323] ? __mutex_lock+0x30d/0x1550 [ 86.176905][ T5323] ? tcm_alloc+0x21/0x2e0 [ 86.176913][ T5323] ? __pfx___mutex_lock+0x10/0x10 [ 86.176923][ T5323] ? __pfx___mutex_lock+0x10/0x10 [ 86.176934][ T5323] tcm_alloc+0x21/0x2e0 [ 86.176942][ T5323] usb_get_function+0x63/0xb0 [ 86.176950][ T5323] config_usb_cfg_link+0x148/0x260 [ 86.176959][ T5323] configfs_symlink+0x59a/0x1030 [ 86.176967][ T5323] ? lookup_one_qstr_excl+0x1d4/0x360 [ 86.176977][ T5323] ? make_vfsuid+0x49/0xa0 [ 86.176984][ T5323] ? __pfx_configfs_symlink+0x10/0x10 [ 86.176991][ T5323] ? bpf_lsm_inode_symlink+0x9/0x20 [ 86.177002][ T5323] vfs_symlink+0x18b/0x330 [ 86.177009][ T5323] ? security_path_symlink+0xfd/0x360 [ 86.177017][ T5323] filename_symlinkat+0x1cd/0x410 [ 86.177025][ T5323] ? __pfx_filename_symlinkat+0x10/0x10 [ 86.177032][ T5323] ? do_getname+0x151/0x250 [ 86.177039][ T5323] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.177046][ T5323] __se_sys_symlinkat+0x4e/0x2b0 [ 86.177053][ T5323] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.177060][ T5323] do_syscall_64+0x174/0x580 [ 86.177068][ T5323] ? trace_irq_disable+0x3b/0x140 [ 86.177077][ T5323] ? clear_bhb_loop+0x40/0x90 [ 86.177085][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 86.177092][ T5323] RIP: 0033:0x7fbb6099e019 [ 86.177100][ T5323] 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 [ 86.177106][ T5323] RSP: 002b:00007fbb61791fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 86.177114][ T5323] RAX: ffffffffffffffda RBX: 00007fbb60c25fa0 RCX: 00007fbb6099e019 [ 86.177119][ T5323] RDX: 0000200000000a40 RSI: ffffffffffffff9c RDI: 0000200000000a00 [ 86.177124][ T5323] RBP: 00007fbb60a3500c R08: 0000000000000000 R09: 0000000000000000 [ 86.177128][ T5323] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 86.177132][ T5323] R13: 00007fbb60c26038 R14: 00007fbb60c25fa0 R15: 00007fffec365128 [ 86.177139][ T5323] [ 86.275817][ T24] audit: type=1800 audit(1785849837.389:5): pid=5323 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4281 res=0 errno=0 [ 86.282748][ T24] audit: type=1800 audit(1785849837.389:6): pid=5323 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4282 res=0 errno=0 [ 86.297032][ T24] audit: type=1800 audit(1785849837.679:7): pid=5324 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4283 res=0 errno=0 [ 86.416353][ T9] cfg80211: failed to load regulatory.db [ 86.543647][ T1256] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 86.694567][ T1256] usb 5-1: Dual-Role OTG device on HNP port [ 86.697148][ T1256] usb 5-1: New USB device found, idVendor=1d6b, idProduct=0104, bcdDevice= 7.02 [ 86.700562][ T1256] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 86.707125][ T9] Using the BOT protocol [ 86.714526][ T10] Using the UAS protocol [ 86.730754][ T1256] scsi host6: uas