loop0: detected capacity change from 0 to 2048 ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= 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 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0 Not tainted -------------------------------------------- syz.0.0/5328 is trying to acquire lock: ffff8880432e6128 (&sbi->s_alloc_mutex){+.+.}-{3:3}, at: udf_table_free_blocks fs/udf/balloc.c:375 [inline] ffff8880432e6128 (&sbi->s_alloc_mutex){+.+.}-{3:3}, at: udf_free_blocks+0x9ff/0x2270 fs/udf/balloc.c:677 but task is already holding lock: ffff8880432e6128 (&sbi->s_alloc_mutex){+.+.}-{3:3}, at: udf_table_prealloc_blocks fs/udf/balloc.c:516 [inline] ffff8880432e6128 (&sbi->s_alloc_mutex){+.+.}-{3:3}, at: udf_prealloc_blocks+0x820/0x13d0 fs/udf/balloc.c:701 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 4 locks held by syz.0.0/5328: #0: ffff8880438b6420 (sb_writers#11){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x220 fs/splice.c:1163 #1: ffff888043f24f60 (&sb->s_type->i_mutex_key#19){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff888043f24f60 (&sb->s_type->i_mutex_key#19){+.+.}-{3:3}, at: udf_file_write_iter+0x6f/0x660 fs/udf/file.c:95 #2: ffff888043f24d90 (&ei->i_data_sem#2){++++}-{3:3}, at: udf_map_block+0x3b7/0x5340 fs/udf/inode.c:439 #3: ffff8880432e6128 (&sbi->s_alloc_mutex){+.+.}-{3:3}, at: udf_table_prealloc_blocks fs/udf/balloc.c:516 [inline] #3: ffff8880432e6128 (&sbi->s_alloc_mutex){+.+.}-{3:3}, at: udf_prealloc_blocks+0x820/0x13d0 fs/udf/balloc.c:701 stack backtrace: CPU: 0 UID: 0 PID: 5328 Comm: syz.0.0 Not tainted 6.12.0-rc5-syzkaller-00063-g0fc810ae3ae1 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_deadlock_bug+0x483/0x620 kernel/locking/lockdep.c:3037 check_deadlock kernel/locking/lockdep.c:3089 [inline] validate_chain+0x15e2/0x5920 kernel/locking/lockdep.c:3891 __lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752 udf_table_free_blocks fs/udf/balloc.c:375 [inline] udf_free_blocks+0x9ff/0x2270 fs/udf/balloc.c:677 udf_delete_aext+0x70a/0xed0 fs/udf/inode.c:2372 udf_table_prealloc_blocks fs/udf/balloc.c:543 [inline] udf_prealloc_blocks+0xf2b/0x13d0 fs/udf/balloc.c:701 udf_prealloc_extents fs/udf/inode.c:1052 [inline] inode_getblk fs/udf/inode.c:910 [inline] udf_map_block+0x284a/0x5340 fs/udf/inode.c:447 __udf_get_block+0x126/0x410 fs/udf/inode.c:461 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2121 block_write_begin+0x8f/0x120 fs/buffer.c:2231 udf_write_begin+0x104/0x350 fs/udf/inode.c:256 generic_perform_write+0x344/0x6d0 mm/filemap.c:4054 __generic_file_write_iter+0x1b5/0x230 mm/filemap.c:4152 udf_file_write_iter+0x2fc/0x660 fs/udf/file.c:111 iter_file_splice_write+0xbfa/0x1510 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x11b/0x220 fs/splice.c:1164 splice_direct_to_actor+0x586/0xc80 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x289/0x3e0 fs/splice.c:1233 do_sendfile+0x561/0xe10 fs/read_write.c:1388 __do_sys_sendfile64 fs/read_write.c:1455 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1441 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe35557e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe35644a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fe355735f80 RCX: 00007fe35557e719 RDX: 0000000000000000 RSI: 000000000000000a RDI: 000000000000000a RBP: 00007fe3555f132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe355735f80 R15: 00007ffcceb987c8