====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.5.470/5972 is trying to acquire lock: ffff88807860a990 (jbd2_handle){++++}-{0:0}, at: wait_transaction_locked+0x19f/0x270 fs/jbd2/transaction.c:178 but task is already holding lock: ffff88805f390ce8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 ocfs2_update_inode_atime+0xed/0x580 fs/ocfs2/file.c:257 ocfs2_inode_lock_atime+0x338/0x530 fs/ocfs2/dlmglue.c:2606 ocfs2_readdir+0x184/0x470 fs/ocfs2/dir.c:1954 iterate_dir+0x213/0x550 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xf2/0x270 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #4 (sb_internal#3){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1811 [inline] sb_start_intwrite include/linux/fs.h:1928 [inline] ocfs2_start_trans+0x2a7/0x6f0 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x6c0/0xb30 fs/ocfs2/quota_global.c:848 dqget+0x713/0xbb0 fs/quota/dquot.c:1010 __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1539 ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x8c1/0x2510 fs/ocfs2/namei.c:310 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x120a/0x2fb0 fs/namei.c:3747 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #3 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ocfs2_create_local_dquot+0x199/0x18d0 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x822/0xb30 fs/ocfs2/quota_global.c:871 dqget+0x713/0xbb0 fs/quota/dquot.c:1010 __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1539 ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x8c1/0x2510 fs/ocfs2/namei.c:310 ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3470 [inline] open_last_lookups fs/namei.c:3540 [inline] path_openat+0x120a/0x2fb0 fs/namei.c:3747 do_filp_open+0x1df/0x400 fs/namei.c:3777 do_sys_openat2+0x14b/0x500 fs/open.c:1255 do_sys_open fs/open.c:1271 [inline] __do_sys_openat fs/open.c:1287 [inline] __se_sys_openat fs/open.c:1282 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1282 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #2 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 dquot_commit+0x5a/0x410 fs/quota/dquot.c:532 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6212 mark_dquot_dirty fs/quota/dquot.c:397 [inline] mark_all_dquot_dirty+0x1e3/0x400 fs/quota/dquot.c:437 __dquot_alloc_space+0x5cb/0xe10 fs/quota/dquot.c:1774 dquot_alloc_space_nodirty include/linux/quotaops.h:290 [inline] dquot_alloc_space include/linux/quotaops.h:303 [inline] dquot_alloc_block include/linux/quotaops.h:327 [inline] ext4_mb_new_blocks+0xf80/0x47c0 fs/ext4/mballoc.c:5750 ext4_ext_map_blocks+0x17d1/0x63d0 fs/ext4/extents.c:4372 ext4_map_blocks+0x97f/0x1a50 fs/ext4/inode.c:675 _ext4_get_block+0x1e7/0x540 fs/ext4/inode.c:818 ext4_block_write_begin+0x5ff/0x1200 fs/ext4/inode.c:1103 ext4_write_begin+0x6c8/0x15d0 fs/ext4/ext4_jbd2.h:-1 __page_symlink+0x102/0x200 fs/namei.c:5199 ext4_symlink+0x885/0xcd0 fs/ext4/namei.c:3467 vfs_symlink+0x245/0x3d0 fs/namei.c:4437 do_symlinkat+0x1ab/0x6b0 fs/namei.c:4466 __do_sys_symlink fs/namei.c:4488 [inline] __se_sys_symlink fs/namei.c:4486 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4486 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&ei->i_data_sem){++++}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ext4_map_blocks+0x350/0x1a50 fs/ext4/inode.c:600 ext4_append+0x22d/0x560 fs/ext4/namei.c:75 ext4_init_new_dir+0x2a7/0x910 fs/ext4/namei.c:3030 ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3076 vfs_mkdir+0x386/0x570 fs/namei.c:4073 do_mkdirat+0x1dd/0x5c0 fs/namei.c:4098 __do_sys_mkdir fs/namei.c:4118 [inline] __se_sys_mkdir fs/namei.c:4116 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4116 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (jbd2_handle){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 wait_transaction_locked+0x1bb/0x270 fs/jbd2/transaction.c:178 add_transaction_credits+0x104/0xcb0 fs/jbd2/transaction.c:242 start_this_handle+0x723/0x1560 fs/jbd2/transaction.c:423 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560 ocfs2_start_trans+0x3b2/0x6f0 fs/ocfs2/journal.c:376 ocfs2_del_inode_from_orphan+0x169/0x7b0 fs/ocfs2/namei.c:2722 ocfs2_dio_end_io_write fs/ocfs2/aops.c:2407 [inline] ocfs2_dio_end_io+0x1074/0x13f0 fs/ocfs2/aops.c:2446 dio_complete+0x255/0x700 fs/direct-io.c:272 do_blockdev_direct_IO fs/direct-io.c:1336 [inline] __blockdev_direct_IO+0x2eb0/0x3b20 fs/direct-io.c:1368 ocfs2_direct_IO+0x233/0x2a0 fs/ocfs2/aops.c:2483 generic_file_direct_write+0x222/0x470 mm/filemap.c:3687 __generic_file_write_iter+0x2b2/0x4e0 mm/filemap.c:3869 ocfs2_file_write_iter+0x171a/0x1ee0 fs/ocfs2/file.c:2472 do_iter_readv_writev+0x47d/0x5f0 fs/read_write.c:-1 do_iter_write+0x1f8/0x7a0 fs/read_write.c:855 iter_file_splice_write+0x6be/0xcf0 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:956 splice_direct_to_actor+0x4e8/0xc00 fs/splice.c:902 do_splice_direct+0x1d4/0x2f0 fs/splice.c:1008 do_sendfile+0x524/0xe30 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64+0x141/0x1a0 fs/read_write.c:1303 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: jbd2_handle --> sb_internal#3 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_trans_barrier); lock(sb_internal#3); lock(&journal->j_trans_barrier); lock(jbd2_handle); *** DEADLOCK *** 6 locks held by syz.5.470/5972: #0: ffff88805e32c460 (sb_writers#26){.+.+}-{0:0}, at: do_sendfile+0x4ff/0xe30 fs/read_write.c:1248 #1: ffff8880702f89c8 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff8880702f89c8 (&sb->s_type->i_mutex_key#33){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x437/0x1ee0 fs/ocfs2/file.c:2402 #2: ffff888070231808 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #2: ffff888070231808 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x16d/0x44b0 fs/ocfs2/suballoc.c:782 #3: ffff8880702309c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #3: ffff8880702309c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]){+.+.}-{3:3}, at: ocfs2_del_inode_from_orphan+0x12b/0x7b0 fs/ocfs2/namei.c:2713 #4: ffff88805e32c650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_del_inode_from_orphan+0x169/0x7b0 fs/ocfs2/namei.c:2722 #5: ffff88805f390ce8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374 stack backtrace: CPU: 1 PID: 5972 Comm: syz.5.470 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain kernel/locking/lockdep.c:3788 [inline] __lock_acquire+0x2c66/0x7b50 kernel/locking/lockdep.c:5012 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 wait_transaction_locked+0x1bb/0x270 fs/jbd2/transaction.c:178 add_transaction_credits+0x104/0xcb0 fs/jbd2/transaction.c:242 start_this_handle+0x723/0x1560 fs/jbd2/transaction.c:423 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560 ocfs2_start_trans+0x3b2/0x6f0 fs/ocfs2/journal.c:376 ocfs2_del_inode_from_orphan+0x169/0x7b0 fs/ocfs2/namei.c:2722 ocfs2_dio_end_io_write fs/ocfs2/aops.c:2407 [inline] ocfs2_dio_end_io+0x1074/0x13f0 fs/ocfs2/aops.c:2446 dio_complete+0x255/0x700 fs/direct-io.c:272 do_blockdev_direct_IO fs/direct-io.c:1336 [inline] __blockdev_direct_IO+0x2eb0/0x3b20 fs/direct-io.c:1368 ocfs2_direct_IO+0x233/0x2a0 fs/ocfs2/aops.c:2483 generic_file_direct_write+0x222/0x470 mm/filemap.c:3687 __generic_file_write_iter+0x2b2/0x4e0 mm/filemap.c:3869 ocfs2_file_write_iter+0x171a/0x1ee0 fs/ocfs2/file.c:2472 do_iter_readv_writev+0x47d/0x5f0 fs/read_write.c:-1 do_iter_write+0x1f8/0x7a0 fs/read_write.c:855 iter_file_splice_write+0x6be/0xcf0 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:956 splice_direct_to_actor+0x4e8/0xc00 fs/splice.c:902 do_splice_direct+0x1d4/0x2f0 fs/splice.c:1008 do_sendfile+0x524/0xe30 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1317 [inline] __se_sys_sendfile64+0x141/0x1a0 fs/read_write.c:1303 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f844cbf8e59 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:00007f844ae52028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f844ce71fa0 RCX: 00007f844cbf8e59 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000007 RBP: 00007f844cc8ee6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f844ce72038 R14: 00007f844ce71fa0 R15: 00007ffebf63eb48 ocfs2: Unmounting device (7,5) on (node local) syz.5.470 (5972) used greatest stack depth: 17808 bytes left