program: mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./config\x00', 0x1ff) mount(0x0, &(0x7f0000000040)='./config\x00', &(0x7f0000000080)='configfs\x00', 0x0, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f0000000300)='./config/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000340)='./config/usb_gadget/g1\x00', 0x1ff) r0 = openat(0xffffffffffffff9c, &(0x7f0000000380)='./config/usb_gadget/g1/idVendor\x00', 0x2, 0x0) write(r0, &(0x7f00000003c0)='0x1d6b\x00', 0x6) r1 = openat(0xffffffffffffff9c, &(0x7f0000000400)='./config/usb_gadget/g1/idProduct\x00', 0x2, 0x0) write(r1, &(0x7f0000000440)='0x0104\x00', 0x6) mkdirat(0xffffffffffffff9c, &(0x7f0000000480)='./config/usb_gadget/g1/strings\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000004c0)='./config/usb_gadget/g1/strings/0x409\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000500)='./config/usb_gadget/g1/configs\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000540)='./config/usb_gadget/g1/configs/c.1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000580)='./config/usb_gadget/g1/functions\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000005c0)='./config/usb_gadget/g1/functions/tcm.0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./config/target\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./config/target/core\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./config/target/core/ramdisk_0\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000001c0)='./config/target/core/ramdisk_0/rd\x00', 0x1ff) r2 = openat(0xffffffffffffff9c, &(0x7f0000000200)='./config/target/core/ramdisk_0/rd/control\x00', 0x2, 0x0) write(r2, &(0x7f0000000240)='rd_pages=32768\x00', 0xe) r3 = openat(0xffffffffffffff9c, &(0x7f0000000280)='./config/target/core/ramdisk_0/rd/enable\x00', 0x2, 0x0) write(r3, &(0x7f00000002c0)='1\x00', 0x1) mkdirat(0xffffffffffffff9c, &(0x7f0000000600)='./config/target/usb_gadget\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000640)='./config/target/usb_gadget/naa.6001405123456789\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000680)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f00000006c0)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun\x00', 0x1ff) mkdirat(0xffffffffffffff9c, &(0x7f0000000700)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0\x00', 0x1ff) symlinkat(&(0x7f0000000740)='./config/target/core/ramdisk_0/rd\x00', 0xffffffffffffff9c, &(0x7f0000000780)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/lun/lun_0/port1\x00') r4 = openat(0xffffffffffffff9c, &(0x7f00000007c0)='./config/target/usb_gadget/naa.6001405123456789/tpgt_1/enable\x00', 0x2, 0x0) write(r4, &(0x7f0000000800)='1\x00', 0x1) symlinkat(&(0x7f0000000840)='./config/usb_gadget/g1/functions/tcm.0\x00', 0xffffffffffffff9c, &(0x7f0000000880)='./config/usb_gadget/g1/configs/c.1/tcm.0\x00') r5 = openat(0xffffffffffffff9c, &(0x7f00000008c0)='./config/usb_gadget/g1/UDC\x00', 0x2, 0x0) write(r5, &(0x7f0000000900)='dummy_udc.0\x00', 0xb) nanosleep(&(0x7f0000000940)={0x1}, 0x0) [ 94.696899][ T5321] [ 94.698008][ T5321] ====================================================== [ 94.700686][ T5321] WARNING: possible circular locking dependency detected [ 94.703531][ T5321] syzkaller #0 Not tainted [ 94.705307][ T5321] ------------------------------------------------------ [ 94.708245][ T5321] syz.0.0/5321 is trying to acquire lock: [ 94.711831][ T5321] ffffffff8fa50d80 (tpg_instances_lock){+.+.}-{4:4}, at: tcm_alloc+0x21/0x2e0 [ 94.716458][ T5321] [ 94.716458][ T5321] but task is already holding lock: [ 94.720137][ T5321] ffff88803fcf2390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 94.732967][ T5321] [ 94.732967][ T5321] which lock already depends on the new lock. [ 94.732967][ T5321] [ 94.737614][ T5321] [ 94.737614][ T5321] the existing dependency chain (in reverse order) is: [ 94.741563][ T5321] [ 94.741563][ T5321] -> #3 (&gi->lock){+.+.}-{4:4}: [ 94.744777][ T5321] __mutex_lock+0x19d/0x1550 [ 94.747355][ T5321] config_usb_cfg_link+0x59/0x260 [ 94.750229][ T5321] configfs_symlink+0x59a/0x1030 [ 94.752924][ T5321] vfs_symlink+0x18b/0x330 [ 94.755219][ T5321] filename_symlinkat+0x1cd/0x410 [ 94.757723][ T5321] __se_sys_symlinkat+0x4e/0x2b0 [ 94.759956][ T5321] do_syscall_64+0x174/0x580 [ 94.762051][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.764619][ T5321] [ 94.764619][ T5321] -> #2 (&sb->s_type->i_mutex_key#24){++++}-{4:4}: [ 94.768189][ T5321] down_write+0x96/0x200 [ 94.770119][ T5321] configfs_depend_item_unlocked+0x153/0x420 [ 94.772805][ T5321] usbg_make_tpg+0x1f6/0x590 [ 94.775018][ T5321] target_fabric_make_tpg+0xa8/0x6d0 [ 94.777515][ T5321] configfs_mkdir+0x4f6/0x9e0 [ 94.779668][ T5321] vfs_mkdir+0x406/0x620 [ 94.781429][ T5321] filename_mkdirat+0x285/0x510 [ 94.783380][ T5321] __se_sys_mkdirat+0x35/0x150 [ 94.785367][ T5321] do_syscall_64+0x174/0x580 [ 94.787441][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.789917][ T5321] [ 94.789917][ T5321] -> #1 (&opts->dep_lock){+.+.}-{4:4}: [ 94.792705][ T5321] __mutex_lock+0x19d/0x1550 [ 94.794545][ T5321] usbg_make_tpg+0x147/0x590 [ 94.796600][ T5321] target_fabric_make_tpg+0xa8/0x6d0 [ 94.798777][ T5321] configfs_mkdir+0x4f6/0x9e0 [ 94.800604][ T5321] vfs_mkdir+0x406/0x620 [ 94.802429][ T5321] filename_mkdirat+0x285/0x510 [ 94.804356][ T5321] __se_sys_mkdirat+0x35/0x150 [ 94.806352][ T5321] do_syscall_64+0x174/0x580 [ 94.808201][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.810498][ T5321] [ 94.810498][ T5321] -> #0 (tpg_instances_lock){+.+.}-{4:4}: [ 94.813428][ T5321] __lock_acquire+0x1520/0x2cf0 [ 94.815477][ T5321] lock_acquire+0x106/0x350 [ 94.817422][ T5321] __mutex_lock+0x19d/0x1550 [ 94.819475][ T5321] tcm_alloc+0x21/0x2e0 [ 94.821037][ T5321] usb_get_function+0x63/0xb0 [ 94.822826][ T5321] config_usb_cfg_link+0x148/0x260 [ 94.824633][ T5321] configfs_symlink+0x59a/0x1030 [ 94.826498][ T5321] vfs_symlink+0x18b/0x330 [ 94.828237][ T5321] filename_symlinkat+0x1cd/0x410 [ 94.830078][ T5321] __se_sys_symlinkat+0x4e/0x2b0 [ 94.832200][ T5321] do_syscall_64+0x174/0x580 [ 94.834505][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.837495][ T5321] [ 94.837495][ T5321] other info that might help us debug this: [ 94.837495][ T5321] [ 94.842302][ T5321] Chain exists of: [ 94.842302][ T5321] tpg_instances_lock --> &sb->s_type->i_mutex_key#24 --> &gi->lock [ 94.842302][ T5321] [ 94.848517][ T5321] Possible unsafe locking scenario: [ 94.848517][ T5321] [ 94.851565][ T5321] CPU0 CPU1 [ 94.853447][ T5321] ---- ---- [ 94.855405][ T5321] lock(&gi->lock); [ 94.856818][ T5321] lock(&sb->s_type->i_mutex_key#24); [ 94.859495][ T5321] lock(&gi->lock); [ 94.861723][ T5321] lock(tpg_instances_lock); [ 94.863466][ T5321] [ 94.863466][ T5321] *** DEADLOCK *** [ 94.863466][ T5321] [ 94.866431][ T5321] 3 locks held by syz.0.0/5321: [ 94.868347][ T5321] #0: ffff888000e66450 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 94.871920][ T5321] #1: ffff88804421c140 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: configfs_symlink+0x3af/0x1030 [ 94.876211][ T5321] #2: ffff88803fcf2390 (&gi->lock){+.+.}-{4:4}, at: config_usb_cfg_link+0x59/0x260 [ 94.880652][ T5321] [ 94.880652][ T5321] stack backtrace: [ 94.883094][ T5321] CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 94.883146][ T5321] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 94.883160][ T5321] Call Trace: [ 94.883204][ T5321] [ 94.883209][ T5321] dump_stack_lvl+0xe8/0x150 [ 94.883229][ T5321] print_circular_bug+0x2e1/0x300 [ 94.883239][ T5321] check_noncircular+0x12e/0x150 [ 94.883248][ T5321] __lock_acquire+0x1520/0x2cf0 [ 94.883262][ T5321] ? __lock_acquire+0x13e8/0x2cf0 [ 94.883284][ T5321] ? __pfx_stack_trace_save+0x10/0x10 [ 94.883301][ T5321] ? tcm_alloc+0x21/0x2e0 [ 94.883320][ T5321] lock_acquire+0x106/0x350 [ 94.883336][ T5321] ? tcm_alloc+0x21/0x2e0 [ 94.883348][ T5321] __mutex_lock+0x19d/0x1550 [ 94.883361][ T5321] ? tcm_alloc+0x21/0x2e0 [ 94.883369][ T5321] ? trace_contention_end+0x3d/0x140 [ 94.883376][ T5321] ? __mutex_lock+0x30d/0x1550 [ 94.883384][ T5321] ? tcm_alloc+0x21/0x2e0 [ 94.883401][ T5321] ? __pfx___mutex_lock+0x10/0x10 [ 94.883419][ T5321] ? __pfx___mutex_lock+0x10/0x10 [ 94.883434][ T5321] tcm_alloc+0x21/0x2e0 [ 94.883470][ T5321] usb_get_function+0x63/0xb0 [ 94.883481][ T5321] config_usb_cfg_link+0x148/0x260 [ 94.883491][ T5321] configfs_symlink+0x59a/0x1030 [ 94.883504][ T5321] ? lookup_one_qstr_excl+0x1d4/0x360 [ 94.883515][ T5321] ? make_vfsuid+0x49/0xa0 [ 94.883522][ T5321] ? __pfx_configfs_symlink+0x10/0x10 [ 94.883529][ T5321] ? bpf_lsm_inode_symlink+0x9/0x20 [ 94.883541][ T5321] vfs_symlink+0x18b/0x330 [ 94.883548][ T5321] ? security_path_symlink+0xfd/0x360 [ 94.883564][ T5321] filename_symlinkat+0x1cd/0x410 [ 94.883571][ T5321] ? __pfx_filename_symlinkat+0x10/0x10 [ 94.883579][ T5321] ? do_getname+0x151/0x250 [ 94.883587][ T5321] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.883595][ T5321] __se_sys_symlinkat+0x4e/0x2b0 [ 94.883603][ T5321] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.883610][ T5321] do_syscall_64+0x174/0x580 [ 94.883620][ T5321] ? trace_irq_disable+0x3b/0x140 [ 94.883629][ T5321] ? clear_bhb_loop+0x40/0x90 [ 94.883637][ T5321] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 94.883645][ T5321] RIP: 0033:0x7fdbddd9e019 [ 94.883669][ 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 [ 94.883676][ T5321] RSP: 002b:00007fdbdecc8fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a [ 94.883685][ T5321] RAX: ffffffffffffffda RBX: 00007fdbde025fa0 RCX: 00007fdbddd9e019 [ 94.883691][ T5321] RDX: 0000200000000880 RSI: ffffffffffffff9c RDI: 0000200000000840 [ 94.883697][ T5321] RBP: 00007fdbdde3500c R08: 0000000000000000 R09: 0000000000000000 [ 94.883702][ T5321] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 94.883707][ T5321] R13: 00007fdbde026038 R14: 00007fdbde025fa0 R15: 00007ffebcca78e8 [ 94.883715][ T5321] [ 94.993239][ T24] audit: type=1800 audit(1785839280.966:2): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idVendor" dev="configfs" ino=4240 res=0 errno=0 [ 95.002957][ T5285] Bluetooth: hci0: command tx timeout [ 95.019617][ T24] audit: type=1800 audit(1785839280.966:3): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="idProduct" dev="configfs" ino=4241 res=0 errno=0 [ 95.041429][ T24] audit: type=1800 audit(1785839280.976:4): pid=5321 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="enable" dev="configfs" ino=4263 res=0 errno=0 [ 95.050831][ T24] audit: type=1800 audit(1785839281.266:5): pid=5323 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed comm="syz.0.0" name="UDC" dev="configfs" ino=4265 res=0 errno=0 [ 95.312412][ T10] usb 5-1: new high-speed USB device number 2 using dummy_hcd [ 95.464230][ T10] usb 5-1: Dual-Role OTG device on HNP port [ 95.467175][ T10] usb 5-1: New USB device found, idVendor=1d6b, idProduct=0104, bcdDevice= 7.02 [ 95.471170][ T10] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 95.487736][ T5309] Using the BOT protocol [ 95.494804][ T939] Using the UAS protocol [ 95.500849][ T10] scsi host6: uas [ 95.527150][ C0] Missing nexus, ignoring command