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) r4 = openat(0xffffffffffffff9c, &(0x7f0000000840)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/nexus\x00', 0x2, 0x0) write(r4, &(0x7f0000000880)='naa.6001405123456789\x00', 0x14) symlinkat(&(0x7f00000008c0)='./config/usb_gadget/g1/functions/tcm.0\x00', 0xffffffffffffff9c, &(0x7f0000000900)='./config/usb_gadget/g1/configs/c.1/tcm.0\x00') r5 = openat(0xffffffffffffff9c, &(0x7f0000000940)='./config/usb_gadget/g1/UDC\x00', 0x2, 0x0) write(r5, &(0x7f0000000980)='dummy_udc.0\x00', 0xb) nanosleep(&(0x7f0000000000)={0x1}, 0x0) r6 = syz_open_dev$sg(0x0, 0x0, 0x0) ioctl$SG_IO(r6, 0x2285, &(0x7f0000000100)={0x53, 0xfffffffe, 0xa, 0x0, @buffer={0x0, 0x1c, &(0x7f0000000200)=""/28}, &(0x7f0000000300)="5f000000000000001c00", &(0x7f0000000400), 0x0, 0x0, 0x0, 0x0}) [ 76.123604][ T24] audit: type=1800 audit(1785850164.839:2): pid=5315 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4218 res=0 errno=0 [ 76.154924][ T24] audit: type=1800 audit(1785850164.859:3): pid=5315 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4225 res=0 errno=0 [ 76.188161][ T24] audit: type=1800 audit(1785850164.859:4): pid=5315 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4226 res=0 errno=0 [ 76.212807][ T24] audit: type=1800 audit(1785850164.929:5): pid=5315 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4247 res=0 errno=0 [ 76.241784][ T1330] ieee802154 phy0 wpan0: encryption failed: -22 [ 76.245211][ T1330] ieee802154 phy1 wpan1: encryption failed: -22 [ 76.250638][ T5315] [ 76.251799][ T5315] ====================================================== [ 76.254929][ T5315] WARNING: possible circular locking dependency detected [ 76.257956][ T5315] syzkaller #0 Not tainted [ 76.260607][ T5315] ------------------------------------------------------ [ 76.263460][ T5315] syz.0.0/5315 is trying to acquire lock: [ 76.265891][ T5315] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 76.269637][ T5315] [ 76.269637][ T5315] but task is already holding lock: [ 76.272614][ T5315] ffff888012c7c390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 76.276398][ T5315] [ 76.276398][ T5315] which lock already depends on the new lock. [ 76.276398][ T5315] [ 76.280685][ T5315] [ 76.280685][ T5315] the existing dependency chain (in reverse order) is: [ 76.284629][ T5315] [ 76.284629][ T5315] -> #3 (&gi->lock){+.+.}-{4:4}: [ 76.288305][ T5315] __mutex_lock+0x19d/0x1550 [ 76.290992][ T5315] config_usb_cfg_link+0x59/0x260 [ 76.293407][ T5315] configfs_symlink+0x59a/0x1030 [ 76.295745][ T5315] vfs_symlink+0x18b/0x330 [ 76.297795][ T5315] filename_symlinkat+0x1cd/0x410 [ 76.300110][ T5315] __se_sys_symlinkat+0x4e/0x2b0 [ 76.302470][ T5315] do_syscall_64+0x174/0x580 [ 76.304647][ T5315] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.307315][ T5315] [ 76.307315][ T5315] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 76.311209][ T5315] down_write+0x96/0x200 [ 76.313250][ T5315] configfs_depend_item_unlocked+0x153/0x420 [ 76.315966][ T5315] usbg_make_tpg+0x1f6/0x590 [ 76.318123][ T5315] target_fabric_make_tpg+0xa8/0x6d0 [ 76.320606][ T5315] configfs_mkdir+0x4f6/0x9e0 [ 76.322844][ T5315] vfs_mkdir+0x406/0x620 [ 76.324860][ T5315] filename_mkdirat+0x285/0x510 [ 76.327023][ T5315] __se_sys_mkdirat+0x35/0x150 [ 76.328780][ T5315] do_syscall_64+0x174/0x580 [ 76.330471][ T5315] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.332558][ T5315] [ 76.332558][ T5315] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 76.334974][ T5315] __mutex_lock+0x19d/0x1550 [ 76.336662][ T5315] usbg_make_tpg+0x147/0x590 [ 76.338327][ T5315] target_fabric_make_tpg+0xa8/0x6d0 [ 76.340267][ T5315] configfs_mkdir+0x4f6/0x9e0 [ 76.341977][ T5315] vfs_mkdir+0x406/0x620 [ 76.343577][ T5315] filename_mkdirat+0x285/0x510 [ 76.345284][ T5315] __se_sys_mkdirat+0x35/0x150 [ 76.347014][ T5315] do_syscall_64+0x174/0x580 [ 76.348690][ T5315] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.350810][ T5315] [ 76.350810][ T5315] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 76.353407][ T5315] __lock_acquire+0x1520/0x2cf0 [ 76.355268][ T5315] lock_acquire+0x106/0x350 [ 76.356973][ T5315] __mutex_lock+0x19d/0x1550 [ 76.358725][ T5315] tcm_alloc+0x21/0x2e0 [ 76.360318][ T5315] usb_get_function+0x63/0xb0 [ 76.362030][ T5315] config_usb_cfg_link+0x148/0x260 [ 76.363859][ T5315] configfs_symlink+0x59a/0x1030 [ 76.365628][ T5315] vfs_symlink+0x18b/0x330 [ 76.367259][ T5315] filename_symlinkat+0x1cd/0x410 [ 76.369079][ T5315] __se_sys_symlinkat+0x4e/0x2b0 [ 76.370863][ T5315] do_syscall_64+0x174/0x580 [ 76.372535][ T5315] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.374599][ T5315] [ 76.374599][ T5315] other info that might help us debug this: [ 76.374599][ T5315] [ 76.377788][ T5315] Chain exists of: [ 76.377788][ T5315] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 76.377788][ T5315] [ 76.382154][ T5315] Possible unsafe locking scenario: [ 76.382154][ T5315] [ 76.384649][ T5315] CPU0 CPU1 [ 76.386400][ T5315] ---- ---- [ 76.388129][ T5315] lock(&gi->lock); [ 76.389458][ T5315] lock(&sb->s_type->i_mutex_key#24); [ 76.392030][ T5315] lock(&gi->lock); [ 76.394050][ T5315] lock(tpg_instances_lock); [ 76.395593][ T5315] [ 76.395593][ T5315] *** DEADLOCK *** [ 76.395593][ T5315] [ 76.398148][ T5315] 3 locks held by syz.0.0/5315: [ 76.399703][ T5315] #0: ffff888000b76450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 76.402724][ T5315] #1: ffff88800e6ffa40 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 76.406211][ T5315] #2: ffff888012c7c390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 76.409282][ T5315] [ 76.409282][ T5315] stack backtrace: [ 76.411294][ T5315] CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 76.411304][ T5315] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 76.411314][ T5315] Call Trace: [ 76.411339][ T5315] [ 76.411344][ T5315] dump_stack_lvl+0xe8/0x150 [ 76.411358][ T5315] print_circular_bug+0x2e1/0x300 [ 76.411367][ T5315] check_noncircular+0x12e/0x150 [ 76.411376][ T5315] __lock_acquire+0x1520/0x2cf0 [ 76.411388][ T5315] ? __lock_acquire+0x13e8/0x2cf0 [ 76.411400][ T5315] ? lockdep_hardirqs_on+0x7a/0x110 [ 76.411410][ T5315] ? tcm_alloc+0x21/0x2e0 [ 76.411418][ T5315] lock_acquire+0x106/0x350 [ 76.411428][ T5315] ? tcm_alloc+0x21/0x2e0 [ 76.411438][ T5315] __mutex_lock+0x19d/0x1550 [ 76.411452][ T5315] ? tcm_alloc+0x21/0x2e0 [ 76.411460][ T5315] ? trace_contention_end+0x3d/0x140 [ 76.411467][ T5315] ? __mutex_lock+0x30d/0x1550 [ 76.411476][ T5315] ? tcm_alloc+0x21/0x2e0 [ 76.411483][ T5315] ? __pfx___mutex_lock+0x10/0x10 [ 76.411492][ T5315] ? __pfx___mutex_lock+0x10/0x10 [ 76.411502][ T5315] tcm_alloc+0x21/0x2e0 [ 76.411518][ T5315] usb_get_function+0x63/0xb0 [ 76.411526][ T5315] config_usb_cfg_link+0x148/0x260 [ 76.411535][ T5315] configfs_symlink+0x59a/0x1030 [ 76.411548][ T5315] ? lookup_one_qstr_excl+0x1d4/0x360 [ 76.411558][ T5315] ? make_vfsuid+0x49/0xa0 [ 76.411566][ T5315] ? __pfx_configfs_symlink+0x10/0x10 [ 76.411574][ T5315] ? bpf_lsm_inode_symlink+0x9/0x20 [ 76.411585][ T5315] vfs_symlink+0x18b/0x330 [ 76.411591][ T5315] ? security_path_symlink+0xfd/0x360 [ 76.411600][ T5315] filename_symlinkat+0x1cd/0x410 [ 76.411608][ T5315] ? __pfx_filename_symlinkat+0x10/0x10 [ 76.411616][ T5315] ? do_getname+0x151/0x250 [ 76.411624][ T5315] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.411632][ T5315] __se_sys_symlinkat+0x4e/0x2b0 [ 76.411639][ T5315] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.411646][ T5315] do_syscall_64+0x174/0x580 [ 76.411654][ T5315] ? trace_irq_disable+0x3b/0x140 [ 76.411663][ T5315] ? clear_bhb_loop+0x40/0x90 [ 76.411670][ T5315] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 76.411677][ T5315] RIP: 0033:0x7ff78759e019 [ 76.411735][ T5315] 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 [ 76.411743][ T5315] RSP: 002b:00007ff78849efe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 76.411751][ T5315] RAX: ffffffffffffffda RBX: 00007ff787825fa0 RCX: 00007ff78759e019 [ 76.411757][ T5315] RDX: 0000200000000900 RSI: ffffffffffffff9c RDI: 00002000000008c0 [ 76.411762][ T5315] RBP: 00007ff78763500c R08: 0000000000000000 R09: 0000000000000000 [ 76.411767][ T5315] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 76.411771][ T5315] R13: 00007ff787826038 R14: 00007ff787825fa0 R15: 00007fffcf7ecde8 [ 76.411779][ T5315] [ 76.556737][ T24] audit: type=1800 audit(1785850165.279:6): pid=5316 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 [ 76.563535][ T5316] udc dummy_udc.0: failed to start g1: -19 [ 76.572223][ T5316] UDC core: g1: couldn't find an available UDC or it's busy [ 76.636035][ T5279] Bluetooth: hci0: command tx timeout