====================================================== WARNING: possible circular locking dependency detected 5.15.189-syzkaller #0 Not tainted ------------------------------------------------------ syz.1.189/4930 is trying to acquire lock: ffff88805eca60a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 but task is already holding lock: ffff888075bc7020 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x96d/0x10d0 fs/ext4/inode.c:4245 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&ei->i_data_sem){++++}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ext4_truncate+0x96d/0x10d0 fs/ext4/inode.c:4245 ext4_setattr+0xffe/0x19e0 fs/ext4/inode.c:5583 notify_change+0xbcd/0xee0 fs/attr.c:505 do_truncate+0x197/0x220 fs/open.c:65 do_sys_ftruncate+0x31b/0x3d0 fs/open.c:193 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 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1338/0x15a0 fs/jbd2/transaction.c:464 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:521 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:560 ocfs2_start_trans+0x374/0x6c0 fs/ocfs2/journal.c:376 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1258 [inline] ocfs2_reserve_local_alloc_bits+0xaeb/0x24c0 fs/ocfs2/localalloc.c:668 ocfs2_reserve_clusters_with_limit+0x1bb/0xba0 fs/ocfs2/suballoc.c:1162 ocfs2_mknod+0xddd/0x22b0 fs/ocfs2/namei.c:354 ocfs2_mkdir+0x192/0x410 fs/ocfs2/namei.c:657 vfs_mkdir+0x387/0x570 fs/namei.c:4065 do_mkdirat+0x1d7/0x5a0 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103 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 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498 ocfs2_start_trans+0x368/0x6c0 fs/ocfs2/journal.c:374 ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1258 [inline] ocfs2_reserve_local_alloc_bits+0xaeb/0x24c0 fs/ocfs2/localalloc.c:668 ocfs2_reserve_clusters_with_limit+0x1bb/0xba0 fs/ocfs2/suballoc.c:1162 ocfs2_mknod+0xddd/0x22b0 fs/ocfs2/namei.c:354 ocfs2_mkdir+0x192/0x410 fs/ocfs2/namei.c:657 vfs_mkdir+0x387/0x570 fs/namei.c:4065 do_mkdirat+0x1d7/0x5a0 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103 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 (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+0x269/0x6c0 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x677/0xaf0 fs/ocfs2/quota_global.c:848 dqget+0x778/0xeb0 fs/quota/dquot.c:988 ocfs2_setattr+0xc93/0x1a10 fs/ocfs2/file.c:1236 notify_change+0xbcd/0xee0 fs/attr.c:505 chown_common+0x483/0x610 fs/open.c:680 vfs_fchown fs/open.c:748 [inline] ksys_fchown+0xe2/0x150 fs/open.c:759 __do_sys_fchown fs/open.c:767 [inline] __se_sys_fchown fs/open.c:765 [inline] __x64_sys_fchown+0x76/0x80 fs/open.c:765 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 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x38/0x60 kernel/locking/rwsem.c:1551 ocfs2_create_local_dquot+0x194/0x1750 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x7cb/0xaf0 fs/ocfs2/quota_global.c:871 dqget+0x778/0xeb0 fs/quota/dquot.c:988 ocfs2_setattr+0xc93/0x1a10 fs/ocfs2/file.c:1236 notify_change+0xbcd/0xee0 fs/attr.c:505 chown_common+0x483/0x610 fs/open.c:680 vfs_fchown fs/open.c:748 [inline] ksys_fchown+0xe2/0x150 fs/open.c:759 __do_sys_fchown fs/open.c:767 [inline] __se_sys_fchown fs/open.c:765 [inline] __x64_sys_fchown+0x76/0x80 fs/open.c:765 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 (&dquot->dq_lock){+.+.}-{3:3}: 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+0x2c33/0x7c60 kernel/locking/lockdep.c:5012 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1eb/0x2390 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:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6183 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 __dquot_free_space+0x7ca/0xb90 fs/quota/dquot.c:1942 dquot_free_space_nodirty include/linux/quotaops.h:376 [inline] dquot_free_space include/linux/quotaops.h:381 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline] ext4_free_blocks+0x1af5/0x2480 fs/ext4/mballoc.c:6286 ext4_remove_blocks fs/ext4/extents.c:2525 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2691 [inline] ext4_ext_remove_space+0x1eaa/0x43a0 fs/ext4/extents.c:2939 ext4_ext_truncate+0x192/0x240 fs/ext4/extents.c:4473 ext4_truncate+0x9f1/0x10d0 fs/ext4/inode.c:4250 ext4_setattr+0xffe/0x19e0 fs/ext4/inode.c:5583 notify_change+0xbcd/0xee0 fs/attr.c:505 do_truncate+0x197/0x220 fs/open.c:65 handle_truncate fs/namei.c:3265 [inline] do_open fs/namei.c:3612 [inline] path_openat+0x28af/0x2f30 fs/namei.c:3742 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769 do_sys_openat2+0x142/0x4a0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_open fs/open.c:1277 [inline] __se_sys_open fs/open.c:1273 [inline] __x64_sys_open+0x11b/0x140 fs/open.c:1273 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: &dquot->dq_lock --> jbd2_handle --> &ei->i_data_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem); lock(jbd2_handle); lock(&ei->i_data_sem); lock(&dquot->dq_lock); *** DEADLOCK *** 5 locks held by syz.1.189/4930: #0: ffff88807bfc4460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:377 #1: ffff888075bc7198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline] #1: ffff888075bc7198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: do_truncate+0x183/0x220 fs/open.c:63 #2: ffff888075bc7338 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline] #2: ffff888075bc7338 (mapping.invalidate_lock){++++}-{3:3}, at: ext4_setattr+0xdb6/0x19e0 fs/ext4/inode.c:5506 #3: ffff888075bc7020 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x96d/0x10d0 fs/ext4/inode.c:4245 #4: ffffffff8c23ea18 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311 stack backtrace: CPU: 0 PID: 4930 Comm: syz.1.189 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 check_noncircular+0x274/0x310 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+0x2c33/0x7c60 kernel/locking/lockdep.c:5012 lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1eb/0x2390 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:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6183 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 __dquot_free_space+0x7ca/0xb90 fs/quota/dquot.c:1942 dquot_free_space_nodirty include/linux/quotaops.h:376 [inline] dquot_free_space include/linux/quotaops.h:381 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6156 [inline] ext4_free_blocks+0x1af5/0x2480 fs/ext4/mballoc.c:6286 ext4_remove_blocks fs/ext4/extents.c:2525 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2691 [inline] ext4_ext_remove_space+0x1eaa/0x43a0 fs/ext4/extents.c:2939 ext4_ext_truncate+0x192/0x240 fs/ext4/extents.c:4473 ext4_truncate+0x9f1/0x10d0 fs/ext4/inode.c:4250 ext4_setattr+0xffe/0x19e0 fs/ext4/inode.c:5583 notify_change+0xbcd/0xee0 fs/attr.c:505 do_truncate+0x197/0x220 fs/open.c:65 handle_truncate fs/namei.c:3265 [inline] do_open fs/namei.c:3612 [inline] path_openat+0x28af/0x2f30 fs/namei.c:3742 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769 do_sys_openat2+0x142/0x4a0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_open fs/open.c:1277 [inline] __se_sys_open fs/open.c:1273 [inline] __x64_sys_open+0x11b/0x140 fs/open.c:1273 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: 0033:0x7f615114ebe9 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:00007f614f3b6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f6151375fa0 RCX: 00007f615114ebe9 RDX: 00000000000000dc RSI: 000000000004827e RDI: 0000200000000200 RBP: 00007f61511d1e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6151376038 R14: 00007f6151375fa0 R15: 00007ffe67b62088