program: syz_mount_image$exfat(&(0x7f00000000c0), &(0x7f00000002c0)='\xe9\x1fq\x89Y\x1e\x923aK\x00', 0x0, &(0x7f00000004c0)=ANY=[@ANYBLOB='dmask=00000000000000000021143,utf8,uid=', @ANYRESHEX=0xee00, @ANYBLOB="2c696f636861727365743d6d616363656e746575726f2c756d61736b3d3030303030dcddc5a7f211352d94d183c93030303030303030303030303030303030342c6e616d65636173653d312c757466382c646973636172642c6572726f72731d72656d23aea8d1cc111916a2f9cbffc24d0d0dbeb5142839a3ea1bebeaa854d9bd12cac5d0c5ecac877ab5e2a65fb85ac5a7c8582abb3ac85927e7e09eb339827842d65cdd92763efffb7743f3f3c3fadda20d83ea1b54ce091d50a9c403d94774c8ab0ac561b737cc4829260a502449", @ANYRESHEX=0x0, @ANYBLOB=',\x00'], 0x1, 0x1533, &(0x7f0000000980)="$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") mkdir(&(0x7f0000001ec0)='./config\x00', 0x1ff) mount(0x0, &(0x7f0000001f00)='./config\x00', &(0x7f0000001f40)='configfs\x00', 0x0, 0x0) mkdir(&(0x7f0000001f80)='./config/usb_gadget/g1\x00', 0x1ff) mkdir(&(0x7f0000001fc0)='./config/usb_gadget/g1/functions/mass_storage.0\x00', 0x1ff) r0 = openat(0xffffffffffffff9c, &(0x7f0000002000)='./config/usb_gadget/g1/functions/mass_storage.0/lun.0/file\x00', 0x2, 0x0) write(r0, &(0x7f0000002040)='file0', 0x5) read$FUSE(r0, &(0x7f0000002080)={0x2020}, 0x2020) syz_mount_image$vfat(&(0x7f0000000040), &(0x7f0000000000)='./file0\x00', 0x8004, &(0x7f00000003c0)=ANY=[@ANYBLOB="756e695f786c6174653d312c696f636861727365743d69736f383835392d352c73686f72746e616d653d77696e6e742c6e6f6e756d7461696c3d302c756e695f786c6174653d312c757466383d302c696f636861727365743d6d616363726f617469616e2c696f636861727365743d6d61636963656c616e642c6e6f6e756d7461696c3d302c6e66732c6e6f6e756d7461696c3d302c756e695f786c6105653d312c666d61736b3d30303030303030303030303030303030303137343735352c646f733178666c6f7070792c00"], 0x1, 0x23a, &(0x7f0000000740)="$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") mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./config\x00', 0x1ff) mount(0x0, &(0x7f0000000280)='./file1\x00', &(0x7f0000000100)='dax\x00', 0x28000, 0x0) mkdirat(0xffffffffffffff9c, &(0x7f0000000140)='./config/usb_gadget/g1\x00', 0x1ff) chdir(&(0x7f0000000180)='./config\x00') openat(0xffffffffffffff9c, &(0x7f00000001c0)='bMaxPacketSize0\x00', 0x1, 0x0) r1 = syz_open_procfs(0x0, &(0x7f0000000200)='fd/3\x00') write$sysctl(r1, &(0x7f0000000240)='4\x00', 0x2) openat(0xffffffffffffff9c, &(0x7f0000000040)='./file1\x00', 0x242, 0x100) [ 95.803335][ T4663] Bluetooth: hci0: command tx timeout [ 95.938700][ T5342] loop0: detected capacity change from 0 to 256 [ 95.974914][ T5342] exfat: Deprecated parameter 'utf8' [ 95.974961][ T5342] exfat: Bad value for 'umask' [ 96.062241][ T5342] LUN: removable file: (no medium) [ 96.075824][ T5342] mass_storage.0/lun.0: unable to open backing file: file0 [ 96.104094][ T5342] loop0: detected capacity change from 0 to 256 [ 96.140630][ T5342] vfat: Unknown parameter 'uni_xlae' [ 96.184987][ T5342] [ 96.187958][ T5342] ============================================ [ 96.190272][ T5342] WARNING: possible recursive locking detected [ 96.192748][ T5342] syzkaller #0 Not tainted [ 96.194479][ T5342] -------------------------------------------- [ 96.196879][ T5342] syz.0.0/5342 is trying to acquire lock: [ 96.199152][ T5342] ffff888033676478 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 [ 96.202717][ T5342] [ 96.202717][ T5342] but task is already holding lock: [ 96.206686][ T5342] ffff888033676478 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 [ 96.209965][ T5342] [ 96.209965][ T5342] other info that might help us debug this: [ 96.213165][ T5342] Possible unsafe locking scenario: [ 96.213165][ T5342] [ 96.216350][ T5342] CPU0 [ 96.217780][ T5342] ---- [ 96.219262][ T5342] lock(sb_writers#12); [ 96.221062][ T5342] lock(sb_writers#12); [ 96.222832][ T5342] [ 96.222832][ T5342] *** DEADLOCK *** [ 96.222832][ T5342] [ 96.226091][ T5342] May be due to missing lock nesting notation [ 96.226091][ T5342] [ 96.229529][ T5342] locks held by syz.0.0/5342: 5, last CPU#0: [ 96.232034][ T5342] #0: ffff88803c709630 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x118/0x160 [ 96.235552][ T5342] #1: ffff888033676478 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 [ 96.239180][ T5342] #2: ffff88800fd39880 (&buffer->mutex){+.+.}-{4:4}, at: configfs_write_iter+0x7e/0x430 [ 96.243089][ T5342] #3: ffff88801380d170 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x238/0x430 [ 96.247252][ T5342] #4: ffff888054057120 (&common->filesem){++++}-{4:4}, at: fsg_store_file+0x163/0x400 [ 96.251345][ T5342] [ 96.251345][ T5342] stack backtrace: [ 96.253916][ T5342] CPU: 0 UID: 0 PID: 5342 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 96.257663][ T5342] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 96.261767][ T5342] Call Trace: [ 96.263267][ T5342] [ 96.264566][ T5342] dump_stack_lvl+0xe8/0x150 [ 96.266440][ T5342] print_deadlock_bug+0x27a/0x290 [ 96.268561][ T5342] __lock_acquire+0x25db/0x2de0 [ 96.270703][ T5342] ? do_syscall_64+0x166/0x520 [ 96.272787][ T5342] ? __lock_acquire+0x747/0x2de0 [ 96.274830][ T5342] lock_acquire+0x115/0x350 [ 96.276731][ T5342] ? mnt_want_write+0x41/0x90 [ 96.278780][ T5342] sb_start_write+0x48/0x1c0 [ 96.280694][ T5342] ? mnt_want_write+0x41/0x90 [ 96.282766][ T5342] mnt_want_write+0x41/0x90 [ 96.284768][ T5342] lookup_open+0x1f7/0x1ae0 [ 96.286803][ T5342] path_openat+0x70c/0x20f0 [ 96.288751][ T5342] do_file_open+0x23e/0x4a0 [ 96.290669][ T5342] ? __pfx_do_file_open+0x10/0x10 [ 96.292720][ T5342] ? do_getname_kernel+0x54/0x230 [ 96.294798][ T5342] ? do_getname_kernel+0x97/0x230 [ 96.296826][ T5342] ? __asan_memcpy+0x40/0x70 [ 96.298848][ T5342] filp_open+0x16d/0x1d0 [ 96.300624][ T5342] ? __pfx_filp_open+0x10/0x10 [ 96.302660][ T5342] fsg_lun_open+0x6c/0xdf0 [ 96.304532][ T5342] fsg_store_file+0x19e/0x400 [ 96.306474][ T5342] ? __pfx_fsg_lun_opts_file_store+0x10/0x10 [ 96.309004][ T5342] configfs_write_iter+0x337/0x430 [ 96.311190][ T5342] vfs_write+0x612/0xba0 [ 96.312980][ T5342] ? __pfx_vfs_write+0x10/0x10 [ 96.316918][ T5342] ? __fget_files+0x3a2/0x420 [ 96.319120][ T5342] ? __fget_files+0x2a/0x420 [ 96.321066][ T5342] ? fdget+0x1ac/0x250 [ 96.322759][ T5342] ksys_write+0x150/0x270 [ 96.325283][ T5342] ? __pfx_ksys_write+0x10/0x10 [ 96.327469][ T5342] do_syscall_64+0x166/0x520 [ 96.329526][ T5342] ? trace_irq_disable+0x3b/0x140 [ 96.331737][ T5342] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 96.334286][ T5342] ? clear_bhb_loop+0x70/0xc0 [ 96.336263][ T5342] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 96.338754][ T5342] RIP: 0033:0x7f225839f559 [ 96.340736][ T5342] 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 [ 96.348865][ T5342] RSP: 002b:00007f2259238fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 96.352218][ T5342] RAX: ffffffffffffffda RBX: 00007f2258625fa0 RCX: 00007f225839f559 [ 96.355527][ T5342] RDX: 0000000000000002 RSI: 0000200000000240 RDI: 0000000000000004 [ 96.359371][ T5342] RBP: 00007f2258436b50 R08: 0000000000000000 R09: 0000000000000000 [ 96.362710][ T5342] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 96.365926][ T5342] R13: 00007f2258626038 R14: 00007f2258625fa0 R15: 00007ffd90e1e3c8 [ 96.369136][ T5342] [ 96.441433][ T5342] mass_storage.0/lun.0: unable to open backing file: 4