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/usb_gadget/g1/UDC\x00', 0x2, 0x0) write(r5, &(0x7f0000000a40)='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}) [ 77.039808][ T5284] Bluetooth: hci0: command tx timeout [ 77.049974][ T1331] ieee802154 phy0 wpan0: encryption failed: -22 [ 77.056402][ T1331] ieee802154 phy1 wpan1: encryption failed: -22 [ 77.240817][ T24] audit: type=1800 audit(1785849919.740:2): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4224 res=0 errno=0 [ 77.281832][ T24] audit: type=1800 audit(1785849919.760:3): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4232 res=0 errno=0 [ 77.305501][ T5320] se_device not configured yet, cannot port link [ 77.308285][ T24] audit: type=1800 audit(1785849919.770:4): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4234 res=0 errno=0 [ 77.320613][ T5320] [ 77.321603][ T5320] ====================================================== [ 77.324208][ T5320] WARNING: possible circular locking dependency detected [ 77.326799][ T5320] syzkaller #0 Not tainted [ 77.328371][ T5320] ------------------------------------------------------ [ 77.330662][ T5320] syz.0.0/5320 is trying to acquire lock: [ 77.332554][ T5320] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 77.335589][ T5320] [ 77.335589][ T5320] but task is already holding lock: [ 77.338238][ T5320] ffff8880124c2390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 77.341886][ T5320] [ 77.341886][ T5320] which lock already depends on the new lock. [ 77.341886][ T5320] [ 77.346063][ T5320] [ 77.346063][ T5320] the existing dependency chain (in reverse order) is: [ 77.349665][ T5320] [ 77.349665][ T5320] -> #3 (&gi->lock){+.+.}-{4:4}: [ 77.352562][ T5320] __mutex_lock+0x19d/0x1550 [ 77.354700][ T5320] config_usb_cfg_link+0x59/0x260 [ 77.356994][ T5320] configfs_symlink+0x59a/0x1030 [ 77.359270][ T5320] vfs_symlink+0x18b/0x330 [ 77.361372][ T5320] filename_symlinkat+0x1cd/0x410 [ 77.363657][ T5320] __se_sys_symlinkat+0x4e/0x2b0 [ 77.365799][ T5320] do_syscall_64+0x174/0x580 [ 77.367738][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.370142][ T5320] [ 77.370142][ T5320] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 77.373453][ T5320] down_write+0x96/0x200 [ 77.375259][ T5320] configfs_depend_item_unlocked+0x153/0x420 [ 77.377590][ T5320] usbg_make_tpg+0x1f6/0x590 [ 77.379308][ T5320] target_fabric_make_tpg+0xa8/0x6d0 [ 77.381441][ T5320] configfs_mkdir+0x4f6/0x9e0 [ 77.383388][ T5320] vfs_mkdir+0x406/0x620 [ 77.385027][ T5320] filename_mkdirat+0x285/0x510 [ 77.386916][ T5320] __se_sys_mkdirat+0x35/0x150 [ 77.389090][ T5320] do_syscall_64+0x174/0x580 [ 77.391059][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.393755][ T5320] [ 77.393755][ T5320] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 77.396968][ T5320] __mutex_lock+0x19d/0x1550 [ 77.399073][ T5320] usbg_make_tpg+0x147/0x590 [ 77.401224][ T5320] target_fabric_make_tpg+0xa8/0x6d0 [ 77.403556][ T5320] configfs_mkdir+0x4f6/0x9e0 [ 77.405687][ T5320] vfs_mkdir+0x406/0x620 [ 77.407607][ T5320] filename_mkdirat+0x285/0x510 [ 77.409752][ T5320] __se_sys_mkdirat+0x35/0x150 [ 77.411856][ T5320] do_syscall_64+0x174/0x580 [ 77.413653][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.416373][ T5320] [ 77.416373][ T5320] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 77.419600][ T5320] __lock_acquire+0x1520/0x2cf0 [ 77.421835][ T5320] lock_acquire+0x106/0x350 [ 77.423919][ T5320] __mutex_lock+0x19d/0x1550 [ 77.425718][ T5320] tcm_alloc+0x21/0x2e0 [ 77.427347][ T5320] usb_get_function+0x63/0xb0 [ 77.429167][ T5320] config_usb_cfg_link+0x148/0x260 [ 77.431109][ T5320] configfs_symlink+0x59a/0x1030 [ 77.433034][ T5320] vfs_symlink+0x18b/0x330 [ 77.434810][ T5320] filename_symlinkat+0x1cd/0x410 [ 77.436736][ T5320] __se_sys_symlinkat+0x4e/0x2b0 [ 77.438911][ T5320] do_syscall_64+0x174/0x580 [ 77.440894][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.443327][ T5320] [ 77.443327][ T5320] other info that might help us debug this: [ 77.443327][ T5320] [ 77.447146][ T5320] Chain exists of: [ 77.447146][ T5320] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 77.447146][ T5320] [ 77.452292][ T5320] Possible unsafe locking scenario: [ 77.452292][ T5320] [ 77.455400][ T5320] CPU0 CPU1 [ 77.457540][ T5320] ---- ---- [ 77.459493][ T5320] lock(&gi->lock); [ 77.461086][ T5320] lock(&sb->s_type->i_mutex_key#24); [ 77.464003][ T5320] lock(&gi->lock); [ 77.466390][ T5320] lock(tpg_instances_lock); [ 77.468130][ T5320] [ 77.468130][ T5320] *** DEADLOCK *** [ 77.468130][ T5320] [ 77.471077][ T5320] 3 locks held by syz.0.0/5320: [ 77.472776][ T5320] #0: ffff888000a9a450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 77.476081][ T5320] #1: ffff888042dc0140 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 77.479919][ T5320] #2: ffff8880124c2390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 77.483269][ T5320] [ 77.483269][ T5320] stack backtrace: [ 77.485390][ T5320] CPU: 0 UID: 0 PID: 5320 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 77.485401][ T5320] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 77.485407][ T5320] Call Trace: [ 77.485411][ T5320] [ 77.485415][ T5320] dump_stack_lvl+0xe8/0x150 [ 77.485429][ T5320] print_circular_bug+0x2e1/0x300 [ 77.485438][ T5320] check_noncircular+0x12e/0x150 [ 77.485447][ T5320] __lock_acquire+0x1520/0x2cf0 [ 77.485459][ T5320] ? __lock_acquire+0x13e8/0x2cf0 [ 77.485470][ T5320] ? __pfx_stack_trace_save+0x10/0x10 [ 77.485481][ T5320] ? tcm_alloc+0x21/0x2e0 [ 77.485489][ T5320] lock_acquire+0x106/0x350 [ 77.485499][ T5320] ? tcm_alloc+0x21/0x2e0 [ 77.485511][ T5320] __mutex_lock+0x19d/0x1550 [ 77.485525][ T5320] ? tcm_alloc+0x21/0x2e0 [ 77.485537][ T5320] ? trace_contention_end+0x3d/0x140 [ 77.485549][ T5320] ? __mutex_lock+0x30d/0x1550 [ 77.485562][ T5320] ? tcm_alloc+0x21/0x2e0 [ 77.485575][ T5320] ? __pfx___mutex_lock+0x10/0x10 [ 77.485595][ T5320] ? __pfx___mutex_lock+0x10/0x10 [ 77.485606][ T5320] tcm_alloc+0x21/0x2e0 [ 77.485614][ T5320] usb_get_function+0x63/0xb0 [ 77.485622][ T5320] config_usb_cfg_link+0x148/0x260 [ 77.485632][ T5320] configfs_symlink+0x59a/0x1030 [ 77.485640][ T5320] ? lookup_one_qstr_excl+0x1d4/0x360 [ 77.485651][ T5320] ? make_vfsuid+0x49/0xa0 [ 77.485658][ T5320] ? __pfx_configfs_symlink+0x10/0x10 [ 77.485666][ T5320] ? bpf_lsm_inode_symlink+0x9/0x20 [ 77.485677][ T5320] vfs_symlink+0x18b/0x330 [ 77.485684][ T5320] ? security_path_symlink+0xfd/0x360 [ 77.485692][ T5320] filename_symlinkat+0x1cd/0x410 [ 77.485700][ T5320] ? __pfx_filename_symlinkat+0x10/0x10 [ 77.485707][ T5320] ? do_getname+0x151/0x250 [ 77.485714][ T5320] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.485721][ T5320] __se_sys_symlinkat+0x4e/0x2b0 [ 77.485728][ T5320] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.485735][ T5320] do_syscall_64+0x174/0x580 [ 77.485744][ T5320] ? trace_irq_disable+0x3b/0x140 [ 77.485753][ T5320] ? clear_bhb_loop+0x40/0x90 [ 77.485760][ T5320] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.485767][ T5320] RIP: 0033:0x7f8fc8b9e019 [ 77.485776][ 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 [ 77.485782][ T5320] RSP: 002b:00007f8fc9a31fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 77.485789][ T5320] RAX: ffffffffffffffda RBX: 00007f8fc8e25fa0 RCX: 00007f8fc8b9e019 [ 77.485795][ T5320] RDX: 00002000000009c0 RSI: ffffffffffffff9c RDI: 0000200000000980 [ 77.485799][ T5320] RBP: 00007f8fc8c3500c R08: 0000000000000000 R09: 0000000000000000 [ 77.485804][ T5320] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 77.485808][ T5320] R13: 00007f8fc8e26038 R14: 00007f8fc8e25fa0 R15: 00007ffc16a5ed78 [ 77.485815][ T5320] [ 77.590552][ T24] audit: type=1800 audit(1785849919.820:5): pid=5320 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="nexus" dev="configfs" ino=4255 res=0 errno=0 [ 77.612186][ T24] audit: type=1800 audit(1785849920.110:6): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4259 res=0 errno=0 [ 77.619332][ T5321] udc dummy_udc.0: failed to start g1: -19 [ 77.622514][ T5321] UDC core: g1: couldn't find an available UDC or it's busy