syzbot

======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc4-syzkaller-00189-g2bfcee565c3a #0 Not tainted
------------------------------------------------------
syz.1.257/8795 is trying to acquire lock:
ffff88802937e610 (sb_internal#6){.+.+}-{0:0}, at: ocfs2_orphan_for_truncate fs/ocfs2/file.c:396 [inline]
ffff88802937e610 (sb_internal#6){.+.+}-{0:0}, at: ocfs2_truncate_file+0x643/0x1420 fs/ocfs2/file.c:500

but task is already holding lock:
ffff88805a1f8660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_truncate_file+0x359/0x1420 fs/ocfs2/file.c:471

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #6 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       ocfs2_lock_global_qf+0x1e8/0x270 fs/ocfs2/quota_global.c:314
       ocfs2_acquire_dquot+0x2b0/0xb30 fs/ocfs2/quota_global.c:828
       dqget+0x7ae/0xf10 fs/quota/dquot.c:977
       __dquot_initialize+0x3b3/0xcb0 fs/quota/dquot.c:1505
       ocfs2_get_init_inode+0x13b/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_symlink+0xaee/0x23e0 fs/ocfs2/namei.c:1887
       vfs_symlink+0x140/0x2f0 fs/namei.c:4723
       do_symlinkat+0x1b1/0x3f0 fs/namei.c:4749
       __do_sys_symlink fs/namei.c:4770 [inline]
       __se_sys_symlink fs/namei.c:4768 [inline]
       __x64_sys_symlink+0x7a/0x90 fs/namei.c:4768
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #5 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:867 [inline]
       ocfs2_lock_global_qf+0x1ca/0x270 fs/ocfs2/quota_global.c:313
       ocfs2_acquire_dquot+0x2b0/0xb30 fs/ocfs2/quota_global.c:828
       dqget+0x7ae/0xf10 fs/quota/dquot.c:977
       __dquot_initialize+0x3b3/0xcb0 fs/quota/dquot.c:1505
       ocfs2_get_init_inode+0x13b/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_symlink+0xaee/0x23e0 fs/ocfs2/namei.c:1887
       vfs_symlink+0x140/0x2f0 fs/namei.c:4723
       do_symlinkat+0x1b1/0x3f0 fs/namei.c:4749
       __do_sys_symlink fs/namei.c:4770 [inline]
       __se_sys_symlink fs/namei.c:4768 [inline]
       __x64_sys_symlink+0x7a/0x90 fs/namei.c:4768
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #4 (&dquot->dq_lock){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       __mutex_lock_common kernel/locking/mutex.c:601 [inline]
       __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746
       wait_on_dquot fs/quota/dquot.c:354 [inline]
       dqget+0x72a/0xf10 fs/quota/dquot.c:972
       dquot_transfer+0x2f8/0x6d0 fs/quota/dquot.c:2140
       ext4_setattr+0x865/0x1bd0 fs/ext4/inode.c:5460
       notify_change+0xb33/0xe40 fs/attr.c:552
       chown_common+0x3f9/0x5a0 fs/open.c:782
       vfs_fchown fs/open.c:850 [inline]
       ksys_fchown+0xea/0x160 fs/open.c:862
       __do_sys_fchown fs/open.c:867 [inline]
       __se_sys_fchown fs/open.c:865 [inline]
       __x64_sys_fchown+0x7a/0x90 fs/open.c:865
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (&ei->xattr_sem){++++}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       ext4_write_lock_xattr fs/ext4/xattr.h:157 [inline]
       ext4_xattr_set_handle+0x165/0x1590 fs/ext4/xattr.c:2362
       ext4_initxattrs+0x9f/0x110 fs/ext4/xattr_security.c:44
       security_inode_init_security+0x29d/0x3f0 security/security.c:1852
       __ext4_new_inode+0x3257/0x3bd0 fs/ext4/ialloc.c:1326
       ext4_create+0x22d/0x460 fs/ext4/namei.c:2824
       lookup_open fs/namei.c:3701 [inline]
       open_last_lookups fs/namei.c:3800 [inline]
       path_openat+0x14f1/0x3830 fs/namei.c:4036
       do_filp_open+0x1fa/0x410 fs/namei.c:4066
       do_sys_openat2+0x121/0x1c0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_openat fs/open.c:1460 [inline]
       __se_sys_openat fs/open.c:1455 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1455
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (jbd2_handle){++++}-{0:0}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       start_this_handle+0x1fa7/0x21c0 fs/jbd2/transaction.c:444
       jbd2__journal_start+0x2c1/0x5b0 fs/jbd2/transaction.c:501
       jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:540
       ocfs2_start_trans+0x376/0x6d0 fs/ocfs2/journal.c:352
       ocfs2_block_group_alloc fs/ocfs2/suballoc.c:685 [inline]
       ocfs2_reserve_suballoc_bits+0x711/0x45f0 fs/ocfs2/suballoc.c:832
       ocfs2_reserve_new_metadata_blocks+0x403/0x940 fs/ocfs2/suballoc.c:982
       ocfs2_mknod+0xe08/0x2050 fs/ocfs2/namei.c:347
       vfs_mknod+0x37c/0x3c0 fs/namei.c:4228
       do_mknodat+0x385/0x4d0 fs/namei.c:-1
       __do_sys_mknodat fs/namei.c:4306 [inline]
       __se_sys_mknodat fs/namei.c:4303 [inline]
       __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4303
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&journal->j_trans_barrier){.+.+}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524
       ocfs2_start_trans+0x36a/0x6d0 fs/ocfs2/journal.c:350
       ocfs2_block_group_alloc fs/ocfs2/suballoc.c:685 [inline]
       ocfs2_reserve_suballoc_bits+0x711/0x45f0 fs/ocfs2/suballoc.c:832
       ocfs2_reserve_new_metadata_blocks+0x403/0x940 fs/ocfs2/suballoc.c:982
       ocfs2_mknod+0xe08/0x2050 fs/ocfs2/namei.c:347
       vfs_mknod+0x37c/0x3c0 fs/namei.c:4228
       do_mknodat+0x385/0x4d0 fs/namei.c:-1
       __do_sys_mknodat fs/namei.c:4306 [inline]
       __se_sys_mknodat fs/namei.c:4303 [inline]
       __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4303
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (sb_internal#6){.+.+}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3166 [inline]
       check_prevs_add kernel/locking/lockdep.c:3285 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
       __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
       percpu_down_read include/linux/percpu-rwsem.h:52 [inline]
       __sb_start_write include/linux/fs.h:1783 [inline]
       sb_start_intwrite include/linux/fs.h:1966 [inline]
       ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:348
       ocfs2_orphan_for_truncate fs/ocfs2/file.c:396 [inline]
       ocfs2_truncate_file+0x643/0x1420 fs/ocfs2/file.c:500
       ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
       notify_change+0xb33/0xe40 fs/attr.c:552
       do_truncate+0x19a/0x220 fs/open.c:65
       handle_truncate fs/namei.c:3501 [inline]
       do_open fs/namei.c:3884 [inline]
       path_openat+0x306c/0x3830 fs/namei.c:4039
       do_filp_open+0x1fa/0x410 fs/namei.c:4066
       do_sys_openat2+0x121/0x1c0 fs/open.c:1429
       do_sys_open fs/open.c:1444 [inline]
       __do_sys_open fs/open.c:1452 [inline]
       __se_sys_open fs/open.c:1448 [inline]
       __x64_sys_open+0x11e/0x150 fs/open.c:1448
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  sb_internal#6 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7 --> &ocfs2_quota_ip_alloc_sem_key

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ocfs2_quota_ip_alloc_sem_key);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7);
                               lock(&ocfs2_quota_ip_alloc_sem_key);
  rlock(sb_internal#6);

 *** DEADLOCK ***

3 locks held by syz.1.257/8795:
 #0: ffff88802937e420 (sb_writers#23){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556
 #1: ffff88805a1f89c0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #1: ffff88805a1f89c0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: do_truncate+0x186/0x220 fs/open.c:63
 #2: ffff88805a1f8660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_truncate_file+0x359/0x1420 fs/ocfs2/file.c:471

stack backtrace:
CPU: 1 UID: 0 PID: 8795 Comm: syz.1.257 Not tainted 6.15.0-rc4-syzkaller-00189-g2bfcee565c3a #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079
 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211
 check_prev_add kernel/locking/lockdep.c:3166 [inline]
 check_prevs_add kernel/locking/lockdep.c:3285 [inline]
 validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909
 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866
 percpu_down_read include/linux/percpu-rwsem.h:52 [inline]
 __sb_start_write include/linux/fs.h:1783 [inline]
 sb_start_intwrite include/linux/fs.h:1966 [inline]
 ocfs2_start_trans+0x26b/0x6d0 fs/ocfs2/journal.c:348
 ocfs2_orphan_for_truncate fs/ocfs2/file.c:396 [inline]
 ocfs2_truncate_file+0x643/0x1420 fs/ocfs2/file.c:500
 ocfs2_setattr+0x1520/0x1b40 fs/ocfs2/file.c:1212
 notify_change+0xb33/0xe40 fs/attr.c:552
 do_truncate+0x19a/0x220 fs/open.c:65
 handle_truncate fs/namei.c:3501 [inline]
 do_open fs/namei.c:3884 [inline]
 path_openat+0x306c/0x3830 fs/namei.c:4039
 do_filp_open+0x1fa/0x410 fs/namei.c:4066
 do_sys_openat2+0x121/0x1c0 fs/open.c:1429
 do_sys_open fs/open.c:1444 [inline]
 __do_sys_open fs/open.c:1452 [inline]
 __se_sys_open fs/open.c:1448 [inline]
 __x64_sys_open+0x11e/0x150 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa2078e969
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:00007faa2158c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007faa209b5fa0 RCX: 00007faa2078e969
RDX: 0000000000000020 RSI: 000000000014927e RDI: 00002000000001c0
RBP: 00007faa20810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007faa209b5fa0 R15: 00007ffd1df0f008
 </TASK>