====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/11773 is trying to acquire lock: ffff888054f4c968 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 but task is already holding lock: ffff888025fde6d8 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x987/0x1230 fs/ext4/inode.c:4284 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+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_truncate+0x987/0x1230 fs/ext4/inode.c:4284 ext4_setattr+0x10cb/0x19f0 fs/ext4/inode.c:5631 notify_change+0xc74/0xf40 fs/attr.c:499 do_truncate+0x197/0x220 fs/open.c:65 do_sys_ftruncate+0x312/0x3c0 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #4 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1f49/0x2150 fs/jbd2/transaction.c:463 jbd2__journal_start+0x2b7/0x5a0 fs/jbd2/transaction.c:520 jbd2_journal_start+0x26/0x30 fs/jbd2/transaction.c:559 ocfs2_start_trans+0x372/0x6c0 fs/ocfs2/journal.c:376 ocfs2_modify_bh+0xe5/0x460 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x13b1/0x16e0 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x756/0xac0 fs/quota/dquot.c:2470 dquot_load_quota_inode+0x2d8/0x5d0 fs/quota/dquot.c:2507 ocfs2_enable_quotas+0x1c3/0x440 fs/ocfs2/super.c:926 ocfs2_fill_super+0x409f/0x4d00 fs/ocfs2/super.c:1139 mount_bdev+0x287/0x3c0 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+0x24a/0xa40 fs/namespace.c:3069 do_mount fs/namespace.c:3412 [inline] __do_sys_mount fs/namespace.c:3620 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3597 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x366/0x6c0 fs/ocfs2/journal.c:374 ocfs2_modify_bh+0xe5/0x460 fs/ocfs2/quota_local.c:101 ocfs2_local_read_info+0x13b1/0x16e0 fs/ocfs2/quota_local.c:764 dquot_load_quota_sb+0x756/0xac0 fs/quota/dquot.c:2470 dquot_load_quota_inode+0x2d8/0x5d0 fs/quota/dquot.c:2507 ocfs2_enable_quotas+0x1c3/0x440 fs/ocfs2/super.c:926 ocfs2_fill_super+0x409f/0x4d00 fs/ocfs2/super.c:1139 mount_bdev+0x287/0x3c0 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+0x24a/0xa40 fs/namespace.c:3069 do_mount fs/namespace.c:3412 [inline] __do_sys_mount fs/namespace.c:3620 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3597 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (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+0x267/0x6c0 fs/ocfs2/journal.c:372 ocfs2_acquire_dquot+0x66e/0xb10 fs/ocfs2/quota_global.c:848 dqget+0x778/0xeb0 fs/quota/dquot.c:988 ocfs2_setattr+0xf16/0x1cf0 fs/ocfs2/file.c:1233 notify_change+0xc74/0xf40 fs/attr.c:499 chown_common+0x486/0x620 fs/open.c:736 vfs_fchown fs/open.c:804 [inline] ksys_fchown+0xe2/0x150 fs/open.c:815 __do_sys_fchown fs/open.c:823 [inline] __se_sys_fchown fs/open.c:821 [inline] __x64_sys_fchown+0x76/0x80 fs/open.c:821 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x1a0/0x1790 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x7ae/0xb10 fs/ocfs2/quota_global.c:871 dqget+0x778/0xeb0 fs/quota/dquot.c:988 ocfs2_setattr+0xf16/0x1cf0 fs/ocfs2/file.c:1233 notify_change+0xc74/0xf40 fs/attr.c:499 chown_common+0x486/0x620 fs/open.c:736 vfs_fchown fs/open.c:804 [inline] ksys_fchown+0xe2/0x150 fs/open.c:815 __do_sys_fchown fs/open.c:823 [inline] __se_sys_fchown fs/open.c:821 [inline] __x64_sys_fchown+0x76/0x80 fs/open.c:821 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6792 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 __dquot_free_space+0x7ec/0xbc0 fs/quota/dquot.c:1942 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline] dquot_free_space include/linux/quotaops.h:384 [inline] dquot_free_block include/linux/quotaops.h:395 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6138 [inline] ext4_free_blocks+0x1bab/0x2640 fs/ext4/mballoc.c:6268 ext4_remove_blocks fs/ext4/extents.c:2526 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2692 [inline] ext4_ext_remove_space+0x1f0d/0x4490 fs/ext4/extents.c:2940 ext4_ext_truncate+0x211/0x370 fs/ext4/extents.c:4470 ext4_truncate+0xa0b/0x1230 fs/ext4/inode.c:4289 ext4_evict_inode+0xb35/0x1100 fs/ext4/inode.c:286 evict+0x485/0x870 fs/inode.c:705 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x397/0x4d0 fs/namei.c:4204 do_rmdir+0x288/0x5e0 fs/namei.c:4252 __do_sys_unlinkat fs/namei.c:4432 [inline] __se_sys_unlinkat fs/namei.c:4426 [inline] __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4426 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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-executor/11773: #0: ffff888067468460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:393 #1: ffff8880747f4030 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #1: ffff8880747f4030 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_rmdir+0x19d/0x5e0 fs/namei.c:4239 #2: ffff888067468650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1891 [inline] #2: ffff888067468650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:2013 [inline] #2: ffff888067468650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x436/0x1100 fs/ext4/inode.c:240 #3: ffff888025fde6d8 (&ei->i_data_sem){++++}-{3:3}, at: ext4_truncate+0x987/0x1230 fs/ext4/inode.c:4284 #4: ffffffff8cc71c88 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #4: ffffffff8cc71c88 (dquot_srcu){....}-{0:0}, at: srcu_read_lock include/linux/srcu.h:165 [inline] #4: ffffffff8cc71c88 (dquot_srcu){....}-{0:0}, at: __dquot_free_space+0x174/0xbc0 fs/quota/dquot.c:1915 stack backtrace: CPU: 1 PID: 11773 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6792 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 __dquot_free_space+0x7ec/0xbc0 fs/quota/dquot.c:1942 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline] dquot_free_space include/linux/quotaops.h:384 [inline] dquot_free_block include/linux/quotaops.h:395 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6138 [inline] ext4_free_blocks+0x1bab/0x2640 fs/ext4/mballoc.c:6268 ext4_remove_blocks fs/ext4/extents.c:2526 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2692 [inline] ext4_ext_remove_space+0x1f0d/0x4490 fs/ext4/extents.c:2940 ext4_ext_truncate+0x211/0x370 fs/ext4/extents.c:4470 ext4_truncate+0xa0b/0x1230 fs/ext4/inode.c:4289 ext4_evict_inode+0xb35/0x1100 fs/ext4/inode.c:286 evict+0x485/0x870 fs/inode.c:705 d_delete_notify include/linux/fsnotify.h:267 [inline] vfs_rmdir+0x397/0x4d0 fs/namei.c:4204 do_rmdir+0x288/0x5e0 fs/namei.c:4252 __do_sys_unlinkat fs/namei.c:4432 [inline] __se_sys_unlinkat fs/namei.c:4426 [inline] __x64_sys_unlinkat+0xc0/0xe0 fs/namei.c:4426 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb26e18e4a7 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 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:00007ffec7d3ea48 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fb26e18e4a7 RDX: 0000000000000200 RSI: 00007ffec7d3fbf0 RDI: 00000000ffffff9c RBP: 00007fb26e211d7d R08: 000055557421566b R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000207 R12: 00007ffec7d3fbf0 R13: 00007fb26e211d7d R14: 000000000015af68 R15: 00007ffec7d41db0 EXT4-fs error (device loop2): ext4_readdir:263: inode #12: block 32: comm syz-executor: path /77/bus/file0: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_empty_dir:3145: inode #12: block 32: comm syz-executor: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs error (device loop2): ext4_readdir:263: inode #12: block 32: comm syz-executor: path /77/bus/file0: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_empty_dir:3145: inode #12: block 32: comm syz-executor: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs error (device loop2): ext4_readdir:263: inode #12: block 32: comm syz-executor: path /77/bus/file0: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_empty_dir:3145: inode #12: block 32: comm syz-executor: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs error (device loop2): ext4_readdir:263: inode #12: block 32: comm syz-executor: path /77/bus/file0: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_empty_dir:3145: inode #12: block 32: comm syz-executor: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs error (device loop2): ext4_readdir:263: inode #12: block 32: comm syz-executor: path /77/bus/file0: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs error (device loop2): ext4_empty_dir:3145: inode #12: block 32: comm syz-executor: bad entry in directory: rec_len is smaller than minimal - offset=0, inode=3, rec_len=0, size=2048 fake=0 EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs warning (device loop2): ext4_empty_dir:3147: inode #12: comm syz-executor: directory missing '.' EXT4-fs: 136 callbacks suppressed EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only EXT4-fs (loop2): Remounting filesystem read-only