====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.318/5359 is trying to acquire lock: ffff88804eeb4990 (jbd2_handle){++++}-{0:0}, at: wait_transaction_locked+0x1a6/0x270 fs/jbd2/transaction.c:177 but task is already holding lock: ffff888073c9b0e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a4/0x6f0 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+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xe0/0x4c0 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x1499/0x1820 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x72f/0xa80 fs/quota/dquot.c:2492 dquot_load_quota_inode+0x2d3/0x5c0 fs/quota/dquot.c:2529 ocfs2_enable_quotas+0x1c0/0x4a0 fs/ocfs2/super.c:926 ocfs2_fill_super+0x434e/0x5020 fs/ocfs2/super.c:1139 mount_bdev+0x28a/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #4 (sb_internal#2){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1891 [inline] sb_start_intwrite include/linux/fs.h:2013 [inline] ocfs2_start_trans+0x2a5/0x6f0 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x69a/0xb80 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+0xb90/0x2580 fs/ocfs2/namei.c:310 ocfs2_create+0x1b6/0x4b0 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3490 [inline] open_last_lookups fs/namei.c:3558 [inline] path_openat+0x11b9/0x2f10 fs/namei.c:3788 do_filp_open+0x1ee/0x420 fs/namei.c:3818 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x19a/0x1900 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x7e6/0xb80 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+0xb90/0x2580 fs/ocfs2/namei.c:310 ocfs2_create+0x1b6/0x4b0 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3490 [inline] open_last_lookups fs/namei.c:3558 [inline] path_openat+0x11b9/0x2f10 fs/namei.c:3788 do_filp_open+0x1ee/0x420 fs/namei.c:3818 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:532 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6817 mark_dquot_dirty fs/quota/dquot.c:397 [inline] mark_all_dquot_dirty+0x1e3/0x400 fs/quota/dquot.c:437 __dquot_free_space+0x7f8/0xbc0 fs/quota/dquot.c:1964 dquot_free_space_nodirty include/linux/quotaops.h:372 [inline] dquot_free_space include/linux/quotaops.h:377 [inline] dquot_free_block include/linux/quotaops.h:388 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6153 [inline] ext4_free_blocks+0x1be5/0x26a0 fs/ext4/mballoc.c:6283 ext4_remove_blocks fs/ext4/extents.c:2541 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2707 [inline] ext4_ext_remove_space+0x1e82/0x43d0 fs/ext4/extents.c:2955 ext4_ext_truncate+0x213/0x370 fs/ext4/extents.c:4491 ext4_truncate+0xa5b/0x12a0 fs/ext4/inode.c:4302 ext4_evict_inode+0xb21/0x10e0 fs/ext4/inode.c:288 evict+0x4b6/0x8b0 fs/inode.c:705 ext4_orphan_cleanup+0xc32/0x1470 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5574 [inline] ext4_fill_super+0x6f0c/0x78f0 fs/ext4/super.c:5693 get_tree_bdev+0x3e6/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&ei->i_data_sem){++++}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x338/0x1a90 fs/ext4/inode.c:606 ext4_append+0x22d/0x560 fs/ext4/namei.c:75 ext4_init_new_dir+0x2b8/0x550 fs/ext4/namei.c:3030 ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3076 vfs_mkdir+0x386/0x570 fs/namei.c:4114 do_mkdirat+0x1d8/0x440 fs/namei.c:4139 __do_sys_mkdir fs/namei.c:4159 [inline] __se_sys_mkdir fs/namei.c:4157 [inline] __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4157 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (jbd2_handle){++++}-{0:0}: check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 wait_transaction_locked+0x1bf/0x270 fs/jbd2/transaction.c:177 add_transaction_credits fs/jbd2/transaction.c:241 [inline] start_this_handle+0x7e7/0x2240 fs/jbd2/transaction.c:422 jbd2__journal_restart+0x235/0x6c0 fs/jbd2/transaction.c:815 ocfs2_extend_trans+0x2fc/0x800 fs/ocfs2/journal.c:459 ocfs2_extend_rotate_transaction fs/ocfs2/alloc.c:2297 [inline] ocfs2_try_to_merge_extent+0xdb9/0x1cd0 fs/ocfs2/alloc.c:3805 ocfs2_split_extent+0x14e3/0x21e0 fs/ocfs2/alloc.c:5131 ocfs2_change_extent_flag+0xb11/0xe30 fs/ocfs2/alloc.c:5222 ocfs2_mark_extent_written+0x30f/0x600 fs/ocfs2/alloc.c:5268 ocfs2_dio_end_io_write fs/ocfs2/aops.c:2367 [inline] ocfs2_dio_end_io+0x881/0x13f0 fs/ocfs2/aops.c:2446 dio_complete+0x249/0x710 fs/direct-io.c:271 __blockdev_direct_IO+0x2e15/0x34c0 fs/direct-io.c:1320 ocfs2_direct_IO+0x233/0x2a0 fs/ocfs2/aops.c:2483 generic_file_direct_write+0x112/0x330 mm/filemap.c:3787 __generic_file_write_iter+0x15f/0x2a0 mm/filemap.c:3945 ocfs2_file_write_iter+0x1731/0x1fc0 fs/ocfs2/file.c:2469 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x638/0xb10 fs/read_write.c:861 iter_file_splice_write+0x6be/0xcf0 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:950 splice_direct_to_actor+0x4b8/0xbd0 fs/splice.c:896 do_splice_direct+0x1ce/0x2f0 fs/splice.c:1002 do_sendfile+0x51b/0xe20 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x141/0x1a0 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: jbd2_handle --> sb_internal#2 --> &journal->j_trans_barrier Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&journal->j_trans_barrier); lock(sb_internal#2); lock(&journal->j_trans_barrier); lock(jbd2_handle); *** DEADLOCK *** 6 locks held by syz.1.318/5359: #0: ffff8880560d4460 (sb_writers#18){.+.+}-{0:0}, at: do_sendfile+0x4f6/0xe20 fs/read_write.c:1254 #1: ffff8880715089c8 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff8880715089c8 (&sb->s_type->i_mutex_key#25){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x45a/0x1fc0 fs/ocfs2/file.c:2399 #2: ffff888071508660 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_dio_end_io_write fs/ocfs2/aops.c:2327 [inline] #2: ffff888071508660 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_dio_end_io+0x43e/0x13f0 fs/ocfs2/aops.c:2446 #3: ffff8880716b1808 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #3: ffff8880716b1808 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x16a/0x4810 fs/ocfs2/suballoc.c:804 #4: ffff8880560d4650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_dio_end_io_write fs/ocfs2/aops.c:2349 [inline] #4: ffff8880560d4650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_dio_end_io+0x7a8/0x13f0 fs/ocfs2/aops.c:2446 #5: ffff888073c9b0e8 (&journal->j_trans_barrier){.+.+}-{3:3}, at: ocfs2_start_trans+0x3a4/0x6f0 fs/ocfs2/journal.c:374 stack backtrace: CPU: 1 PID: 5359 Comm: syz.1.318 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3095 [inline] check_prevs_add kernel/locking/lockdep.c:3214 [inline] validate_chain kernel/locking/lockdep.c:3830 [inline] __lock_acquire+0x2d18/0x7c40 kernel/locking/lockdep.c:5063 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 wait_transaction_locked+0x1bf/0x270 fs/jbd2/transaction.c:177 add_transaction_credits fs/jbd2/transaction.c:241 [inline] start_this_handle+0x7e7/0x2240 fs/jbd2/transaction.c:422 jbd2__journal_restart+0x235/0x6c0 fs/jbd2/transaction.c:815 ocfs2_extend_trans+0x2fc/0x800 fs/ocfs2/journal.c:459 ocfs2_extend_rotate_transaction fs/ocfs2/alloc.c:2297 [inline] ocfs2_try_to_merge_extent+0xdb9/0x1cd0 fs/ocfs2/alloc.c:3805 ocfs2_split_extent+0x14e3/0x21e0 fs/ocfs2/alloc.c:5131 ocfs2_change_extent_flag+0xb11/0xe30 fs/ocfs2/alloc.c:5222 ocfs2_mark_extent_written+0x30f/0x600 fs/ocfs2/alloc.c:5268 ocfs2_dio_end_io_write fs/ocfs2/aops.c:2367 [inline] ocfs2_dio_end_io+0x881/0x13f0 fs/ocfs2/aops.c:2446 dio_complete+0x249/0x710 fs/direct-io.c:271 __blockdev_direct_IO+0x2e15/0x34c0 fs/direct-io.c:1320 ocfs2_direct_IO+0x233/0x2a0 fs/ocfs2/aops.c:2483 generic_file_direct_write+0x112/0x330 mm/filemap.c:3787 __generic_file_write_iter+0x15f/0x2a0 mm/filemap.c:3945 ocfs2_file_write_iter+0x1731/0x1fc0 fs/ocfs2/file.c:2469 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x638/0xb10 fs/read_write.c:861 iter_file_splice_write+0x6be/0xcf0 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xe1/0x130 fs/splice.c:950 splice_direct_to_actor+0x4b8/0xbd0 fs/splice.c:896 do_splice_direct+0x1ce/0x2f0 fs/splice.c:1002 do_sendfile+0x51b/0xe20 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64+0x141/0x1a0 fs/read_write.c:1309 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7efcab59de59 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:00007efcac3fb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007efcab825fa0 RCX: 00007efcab59de59 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006 RBP: 00007efcab633e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efcab826038 R14: 00007efcab825fa0 R15: 00007ffeafdba718 syz.1.318 (5359) used greatest stack depth: 18496 bytes left