syzbot

(syz.0.17,6044,0):ocfs2_block_check_validate:402 ERROR: CRC32 failed: stored: 0xb3775c19, computed 0x2dd1c265. Applying ECC.
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/6044 is trying to acquire lock:
ffff8880576e1890 (&oi->ip_alloc_sem){+.+.}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x340 fs/ocfs2/refcounttree.c:933

but task is already holding lock:
ffff8880576e1918 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340 fs/ocfs2/refcounttree.c:932

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_xattr_sem){++++}-{4:4}:
       down_read+0x97/0x200 kernel/locking/rwsem.c:1537
       ocfs2_init_acl+0x1c3/0x800 fs/ocfs2/acl.c:367
       ocfs2_mknod+0x1423/0x2210 fs/ocfs2/namei.c:414
       ocfs2_create+0x195/0x440 fs/ocfs2/namei.c:677
       lookup_open fs/namei.c:4449 [inline]
       open_last_lookups fs/namei.c:4549 [inline]
       path_openat+0x1902/0x3e70 fs/namei.c:4793
       do_filp_open+0x22d/0x490 fs/namei.c:4823
       do_sys_openat2+0x12f/0x220 fs/open.c:1430
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_creat fs/open.c:1514 [inline]
       __se_sys_creat fs/open.c:1508 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1508
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x97/0x200 kernel/locking/rwsem.c:1537
       ocfs2_start_trans+0x3ac/0x700 fs/ocfs2/journal.c:372
       ocfs2_modify_bh+0xe3/0x4d0 fs/ocfs2/quota_local.c:101
       ocfs2_local_read_info+0x1454/0x1810 fs/ocfs2/quota_local.c:767
       dquot_load_quota_sb+0x791/0xbd0 fs/quota/dquot.c:2462
       dquot_load_quota_inode+0x2e1/0x5d0 fs/quota/dquot.c:2499
       ocfs2_enable_quotas+0x1c8/0x4a0 fs/ocfs2/super.c:930
       ocfs2_fill_super+0x5340/0x6920 fs/ocfs2/super.c:1140
       get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1691
       vfs_get_tree+0x92/0x2a0 fs/super.c:1751
       fc_mount fs/namespace.c:1199 [inline]
       do_new_mount_fc fs/namespace.c:3636 [inline]
       do_new_mount+0x329/0xa50 fs/namespace.c:3712
       do_mount fs/namespace.c:4035 [inline]
       __do_sys_mount fs/namespace.c:4224 [inline]
       __se_sys_mount+0x31d/0x420 fs/namespace.c:4201
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#2){.+.+}-{0:0}:
       percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
       percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
       __sb_start_write include/linux/fs/super.h:19 [inline]
       sb_start_intwrite include/linux/fs/super.h:177 [inline]
       ocfs2_start_trans+0x2ac/0x700 fs/ocfs2/journal.c:370
       ocfs2_orphan_for_truncate fs/ocfs2/file.c:396 [inline]
       ocfs2_truncate_file+0x631/0x1480 fs/ocfs2/file.c:500
       ocfs2_setattr+0x15e5/0x1c70 fs/ocfs2/file.c:1218
       notify_change+0xc18/0xf60 fs/attr.c:546
       do_truncate+0x1c2/0x250 fs/open.c:68
       handle_truncate fs/namei.c:4244 [inline]
       do_open fs/namei.c:4641 [inline]
       path_openat+0x364f/0x3e70 fs/namei.c:4796
       do_filp_open+0x22d/0x490 fs/namei.c:4823
       do_sys_openat2+0x12f/0x220 fs/open.c:1430
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_creat fs/open.c:1514 [inline]
       __se_sys_creat fs/open.c:1508 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1508
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_alloc_sem){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
       ocfs2_try_remove_refcount_tree+0xb6/0x340 fs/ocfs2/refcounttree.c:933
       ocfs2_truncate_file+0xdf3/0x1480 fs/ocfs2/file.c:521
       ocfs2_setattr+0x15e5/0x1c70 fs/ocfs2/file.c:1218
       notify_change+0xc18/0xf60 fs/attr.c:546
       do_truncate+0x1c2/0x250 fs/open.c:68
       handle_truncate fs/namei.c:4244 [inline]
       do_open fs/namei.c:4641 [inline]
       path_openat+0x364f/0x3e70 fs/namei.c:4796
       do_filp_open+0x22d/0x490 fs/namei.c:4823
       do_sys_openat2+0x12f/0x220 fs/open.c:1430
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_creat fs/open.c:1514 [inline]
       __se_sys_creat fs/open.c:1508 [inline]
       __x64_sys_creat+0x8f/0xc0 fs/open.c:1508
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xe2/0xf80 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:
  &oi->ip_alloc_sem --> &journal->j_trans_barrier --> &oi->ip_xattr_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_xattr_sem);
                               lock(&journal->j_trans_barrier);
                               lock(&oi->ip_xattr_sem);
  lock(&oi->ip_alloc_sem);

 *** DEADLOCK ***

3 locks held by syz.0.17/6044:
 #0: ffff88803737c480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:499
 #1: ffff8880576e1c40 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: inode_lock_killable include/linux/fs.h:1032 [inline]
 #1: ffff8880576e1c40 (&sb->s_type->i_mutex_key#23){+.+.}-{4:4}, at: do_truncate+0x18f/0x250 fs/open.c:63
 #2: ffff8880576e1918 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340 fs/ocfs2/refcounttree.c:932

stack backtrace:
CPU: 0 UID: 0 PID: 6044 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
 down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
 ocfs2_try_remove_refcount_tree+0xb6/0x340 fs/ocfs2/refcounttree.c:933
 ocfs2_truncate_file+0xdf3/0x1480 fs/ocfs2/file.c:521
 ocfs2_setattr+0x15e5/0x1c70 fs/ocfs2/file.c:1218
 notify_change+0xc18/0xf60 fs/attr.c:546
 do_truncate+0x1c2/0x250 fs/open.c:68
 handle_truncate fs/namei.c:4244 [inline]
 do_open fs/namei.c:4641 [inline]
 path_openat+0x364f/0x3e70 fs/namei.c:4796
 do_filp_open+0x22d/0x490 fs/namei.c:4823
 do_sys_openat2+0x12f/0x220 fs/open.c:1430
 do_sys_open fs/open.c:1436 [inline]
 __do_sys_creat fs/open.c:1514 [inline]
 __se_sys_creat fs/open.c:1508 [inline]
 __x64_sys_creat+0x8f/0xc0 fs/open.c:1508
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4412e7acb9
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:00007ffcb3ca9768 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f44130f5fa0 RCX: 00007f4412e7acb9
RDX: 0000000000000000 RSI: 0000000000000182 RDI: 00002000000000c0
RBP: 00007f4412ee8bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f44130f5fac R14: 00007f44130f5fa0 R15: 00007f44130f5fa0
 </TASK>