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) symlink(&(0x7f0000000840)='./config/target/core/rd_mcp_0/rd1\x00', &(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) symlink(&(0x7f0000000a00)='./config/usb_gadget/g1/functions/tcm.0\x00', &(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}) [ 76.027920][ T25] audit: type=1800 audit(1785849342.255:2): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4217 res=0 errno=0 [ 76.044533][ T25] audit: type=1800 audit(1785849342.265:3): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4224 res=0 errno=0 [ 76.061975][ T25] audit: type=1800 audit(1785849342.265:4): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4225 res=0 errno=0 [ 76.071897][ T5321] se_device not configured yet, cannot port link [ 76.093376][ T25] audit: type=1800 audit(1785849342.315:5): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4246 res=0 errno=0 [ 76.113729][ T5321] [ 76.114866][ T5321] ====================================================== [ 76.117830][ T5321] WARNING: possible circular locking dependency detected [ 76.120794][ T5321] syzkaller #0 Not tainted [ 76.122738][ T5321] ------------------------------------------------------ [ 76.125637][ T5321] syz.0.0/5321 is trying to acquire lock: [ 76.128029][ T5321] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 76.131744][ T5321] [ 76.131744][ T5321] but task is already holding lock: [ 76.134721][ T5321] ffff8880126c8390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 76.138383][ T5321] [ 76.138383][ T5321] which lock already depends on the new lock. [ 76.138383][ T5321] [ 76.142820][ T5321] [ 76.142820][ T5321] the existing dependency chain (in reverse order) is: [ 76.146647][ T5321] [ 76.146647][ T5321] -> #3 (&gi->lock){+.+.}-{4:4}: [ 76.149567][ T5321] __mutex_lock+0x19d/0x1550 [ 76.151607][ T5321] config_usb_cfg_link+0x59/0x260 [ 76.153796][ T5321] configfs_symlink+0x59a/0x1030 [ 76.155982][ T5321] vfs_symlink+0x18b/0x330 [ 76.157921][ T5321] filename_symlinkat+0x1cd/0x410 [ 76.160095][ T5321] __se_sys_symlink+0x4d/0x2b0 [ 76.162180][ T5321] do_syscall_64+0x174/0x580 [ 76.164266][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.166993][ T5321] [ 76.166993][ T5321] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 76.170560][ T5321] down_write+0x96/0x200 [ 76.172527][ T5321] configfs_depend_item_unlocked+0x153/0x420 [ 76.175190][ T5321] usbg_make_tpg+0x1f6/0x590 [ 76.177275][ T5321] target_fabric_make_tpg+0xa8/0x6d0 [ 76.179740][ T5321] configfs_mkdir+0x4f6/0x9e0 [ 76.181945][ T5321] vfs_mkdir+0x406/0x620 [ 76.183979][ T5321] filename_mkdirat+0x285/0x510 [ 76.186183][ T5321] __se_sys_mkdirat+0x35/0x150 [ 76.188369][ T5321] do_syscall_64+0x174/0x580 [ 76.190501][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.193164][ T5321] [ 76.193164][ T5321] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 76.196392][ T5321] __mutex_lock+0x19d/0x1550 [ 76.198519][ T5321] usbg_make_tpg+0x147/0x590 [ 76.200543][ T5321] target_fabric_make_tpg+0xa8/0x6d0 [ 76.202862][ T5321] configfs_mkdir+0x4f6/0x9e0 [ 76.204911][ T5321] vfs_mkdir+0x406/0x620 [ 76.206853][ T5321] filename_mkdirat+0x285/0x510 [ 76.208977][ T5321] __se_sys_mkdirat+0x35/0x150 [ 76.211087][ T5321] do_syscall_64+0x174/0x580 [ 76.213107][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.215763][ T5321] [ 76.215763][ T5321] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 76.218691][ T5321] __lock_acquire+0x1520/0x2cf0 [ 76.220580][ T5321] lock_acquire+0x106/0x350 [ 76.222422][ T5321] __mutex_lock+0x19d/0x1550 [ 76.224318][ T5321] tcm_alloc+0x21/0x2e0 [ 76.226117][ T5321] usb_get_function+0x63/0xb0 [ 76.228089][ T5321] config_usb_cfg_link+0x148/0x260 [ 76.230219][ T5321] configfs_symlink+0x59a/0x1030 [ 76.232273][ T5321] vfs_symlink+0x18b/0x330 [ 76.234181][ T5321] filename_symlinkat+0x1cd/0x410 [ 76.236244][ T5321] __se_sys_symlink+0x4d/0x2b0 [ 76.238116][ T5321] do_syscall_64+0x174/0x580 [ 76.239888][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.242114][ T5321] [ 76.242114][ T5321] other info that might help us debug this: [ 76.242114][ T5321] [ 76.246361][ T5321] Chain exists of: [ 76.246361][ T5321] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 76.246361][ T5321] [ 76.251516][ T5321] Possible unsafe locking scenario: [ 76.251516][ T5321] [ 76.254540][ T5321] CPU0 CPU1 [ 76.256879][ T5321] ---- ---- [ 76.258979][ T5321] lock(&gi->lock); [ 76.260521][ T5321] lock(&sb->s_type->i_mutex_key#24); [ 76.263576][ T5321] lock(&gi->lock); [ 76.266112][ T5321] lock(tpg_instances_lock); [ 76.267914][ T5321] [ 76.267914][ T5321] *** DEADLOCK *** [ 76.267914][ T5321] [ 76.270918][ T5321] 3 locks held by syz.0.0/5321: [ 76.272700][ T5321] #0: ffff888000a78450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 76.276083][ T5321] #1: ffff888011c9e280 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 76.280310][ T5321] #2: ffff8880126c8390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 76.283986][ T5321] [ 76.283986][ T5321] stack backtrace: [ 76.286277][ T5321] CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 76.286292][ T5321] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 76.286301][ T5321] Call Trace: [ 76.286308][ T5321] [ 76.286314][ T5321] dump_stack_lvl+0xe8/0x150 [ 76.286335][ T5321] print_circular_bug+0x2e1/0x300 [ 76.286349][ T5321] check_noncircular+0x12e/0x150 [ 76.286362][ T5321] __lock_acquire+0x1520/0x2cf0 [ 76.286381][ T5321] ? __lock_acquire+0x13e8/0x2cf0 [ 76.286396][ T5321] ? __pfx_stack_trace_save+0x10/0x10 [ 76.286412][ T5321] ? tcm_alloc+0x21/0x2e0 [ 76.286424][ T5321] lock_acquire+0x106/0x350 [ 76.286441][ T5321] ? tcm_alloc+0x21/0x2e0 [ 76.286456][ T5321] __mutex_lock+0x19d/0x1550 [ 76.286471][ T5321] ? tcm_alloc+0x21/0x2e0 [ 76.286484][ T5321] ? trace_contention_end+0x3d/0x140 [ 76.286496][ T5321] ? __mutex_lock+0x30d/0x1550 [ 76.286509][ T5321] ? tcm_alloc+0x21/0x2e0 [ 76.286521][ T5321] ? __pfx___mutex_lock+0x10/0x10 [ 76.286542][ T5321] ? __pfx___mutex_lock+0x10/0x10 [ 76.286559][ T5321] tcm_alloc+0x21/0x2e0 [ 76.286572][ T5321] usb_get_function+0x63/0xb0 [ 76.286585][ T5321] config_usb_cfg_link+0x148/0x260 [ 76.286597][ T5321] configfs_symlink+0x59a/0x1030 [ 76.286605][ T5321] ? lookup_one_qstr_excl+0x1d4/0x360 [ 76.286615][ T5321] ? make_vfsuid+0x49/0xa0 [ 76.286622][ T5321] ? __pfx_configfs_symlink+0x10/0x10 [ 76.286629][ T5321] ? bpf_lsm_inode_symlink+0x9/0x20 [ 76.286640][ T5321] vfs_symlink+0x18b/0x330 [ 76.286646][ T5321] ? security_path_symlink+0xfd/0x360 [ 76.286655][ T5321] filename_symlinkat+0x1cd/0x410 [ 76.286662][ T5321] ? __pfx_filename_symlinkat+0x10/0x10 [ 76.286670][ T5321] ? do_getname+0x151/0x250 [ 76.286678][ T5321] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.286685][ T5321] __se_sys_symlink+0x4d/0x2b0 [ 76.286692][ T5321] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.286699][ T5321] do_syscall_64+0x174/0x580 [ 76.286709][ T5321] ? trace_irq_disable+0x3b/0x140 [ 76.286722][ T5321] ? clear_bhb_loop+0x40/0x90 [ 76.286733][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.286744][ T5321] RIP: 0033:0x7fdcab39e019 [ 76.286755][ T5321] 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 [ 76.286764][ T5321] RSP: 002b:00007fdcac295fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 [ 76.286776][ T5321] RAX: ffffffffffffffda RBX: 00007fdcab625fa0 RCX: 00007fdcab39e019 [ 76.286785][ T5321] RDX: 0000000000000000 RSI: 0000200000000a40 RDI: 0000200000000a00 [ 76.286793][ T5321] RBP: 00007fdcab43500c R08: 0000000000000000 R09: 0000000000000000 [ 76.286800][ T5321] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 76.286807][ T5321] R13: 00007fdcab626038 R14: 00007fdcab625fa0 R15: 00007ffe5618f5d8 [ 76.286820][ T5321] [ 76.392970][ T25] audit: type=1800 audit(1785849342.335:6): pid=5321 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 [ 76.406489][ T1330] ieee802154 phy0 wpan0: encryption failed: -22 [ 76.409200][ T1330] ieee802154 phy1 wpan1: encryption failed: -22 [ 76.416702][ T25] audit: type=1800 audit(1785849342.645:7): pid=5322 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4248 res=0 errno=0 [ 76.475908][ T44] Bluetooth: hci0: command tx timeout [ 76.655165][ T1369] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 76.805989][ T1369] usb 5-1: Dual-Role OTG device on HNP port [ 76.808673][ T1369] usb 5-1: New USB device found, idVendor=1d6b, idProduct=0104, bcdDevice= 7.02 [ 76.812212][ T1369] usb 5-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 76.817256][ T5308] Using the BOT protocol [ 76.826116][ T5308] Using the UAS protocol [ 76.839667][ T1369] scsi host6: uas