loop0: detected capacity change from 0 to 2048 UDF-fs: error (device loop0): udf_read_tagged: read failed, block=2362, location=2362 UDF-fs: error (device loop0): udf_read_tagged: tag checksum failed, block 99: 0x27 != 0x4d UDF-fs: error (device loop0): udf_read_tagged: tag checksum failed, block 160: 0xd2 != 0xd4 UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) ============================================ WARNING: possible recursive locking detected syzkaller #0 Not tainted -------------------------------------------- syz.0.0/5330 is trying to acquire lock: ffff88801a750928 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_table_free_blocks fs/udf/balloc.c:375 [inline] ffff88801a750928 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_free_blocks+0xaaf/0x1940 fs/udf/balloc.c:677 but task is already holding lock: ffff88801a750928 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_table_new_block fs/udf/balloc.c:581 [inline] ffff88801a750928 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_new_block+0x104a/0x1c70 fs/udf/balloc.c:725 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sbi->s_alloc_mutex); lock(&sbi->s_alloc_mutex); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syz.0.0/5330: #0: ffff888012242420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499 #1: ffff888047b188f0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #1: ffff888047b188f0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: open_last_lookups fs/namei.c:4546 [inline] #1: ffff888047b188f0 (&type->i_mutex_dir_key#8){+.+.}-{4:4}, at: path_openat+0xb53/0x3e20 fs/namei.c:4793 #2: ffff88801a750928 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_table_new_block fs/udf/balloc.c:581 [inline] #2: ffff88801a750928 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_new_block+0x104a/0x1c70 fs/udf/balloc.c:725 stack backtrace: CPU: 0 UID: 0 PID: 5330 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_deadlock_bug+0x279/0x290 kernel/locking/lockdep.c:3041 check_deadlock kernel/locking/lockdep.c:3093 [inline] validate_chain kernel/locking/lockdep.c:3895 [inline] __lock_acquire+0x253f/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868 __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x19f/0x1300 kernel/locking/mutex.c:776 udf_table_free_blocks fs/udf/balloc.c:375 [inline] udf_free_blocks+0xaaf/0x1940 fs/udf/balloc.c:677 udf_delete_aext+0x4fb/0xbd0 fs/udf/inode.c:2383 udf_table_new_block fs/udf/balloc.c:645 [inline] udf_new_block+0x149e/0x1c70 fs/udf/balloc.c:725 udf_new_inode+0x38f/0xd10 fs/udf/ialloc.c:67 udf_create+0x23/0xf0 fs/udf/namei.c:376 lookup_open fs/namei.c:4449 [inline] open_last_lookups fs/namei.c:4549 [inline] path_openat+0x18dd/0x3e20 fs/namei.c:4793 do_filp_open+0x22d/0x490 fs/namei.c:4823 do_sys_openat2+0x12f/0x220 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f22b3f9aeb9 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 RSP: 002b:00007f22b4e53028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f22b4215fa0 RCX: 00007f22b3f9aeb9 RDX: 000000000000275a RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007f22b4008c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f22b4216038 R14: 00007f22b4215fa0 R15: 00007fffc9122e08