======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.312/5507 is trying to acquire lock:
ffff888026296650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_write_begin_inline fs/ocfs2/aops.c:1482 [inline]
ffff888026296650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1585 [inline]
ffff888026296650 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_write_begin_nolock+0x2049/0x4400 fs/ocfs2/aops.c:1671

but task is already holding lock:
ffff88807238ea20 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_write_begin+0x198/0x310 fs/ocfs2/aops.c:1903

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&oi->ip_alloc_sem){++++}-{3:3}:
       down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
       ocfs2_read_virt_blocks+0x237/0x8d0 fs/ocfs2/extent_map.c:984
       ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline]
       ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline]
       ocfs2_find_entry+0x3ca/0x2060 fs/ocfs2/dir.c:1091
       ocfs2_rename+0x1e93/0x3960 fs/ocfs2/namei.c:1568
       vfs_rename+0xbe1/0x1100 fs/namei.c:4840
       do_renameat2+0x8b7/0xf60 fs/namei.c:4993
       __do_sys_renameat2 fs/namei.c:5026 [inline]
       __se_sys_renameat2 fs/namei.c:5023 [inline]
       __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5023
       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 (&journal->j_trans_barrier){.+.+}-{3:3}:
       down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
       ocfs2_start_trans+0x3a6/0x6f0 fs/ocfs2/journal.c:374
       ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1258 [inline]
       ocfs2_reserve_local_alloc_bits+0xb40/0x25f0 fs/ocfs2/localalloc.c:668
       ocfs2_reserve_clusters_with_limit+0x1b6/0xc10 fs/ocfs2/suballoc.c:1162
       ocfs2_mknod+0xef8/0x2510 fs/ocfs2/namei.c:354
       ocfs2_mkdir+0x192/0x420 fs/ocfs2/namei.c:657
       vfs_mkdir+0x387/0x570 fs/namei.c:4073
       do_mkdirat+0x1df/0x5b0 fs/namei.c:4098
       __do_sys_mkdirat fs/namei.c:4113 [inline]
       __se_sys_mkdirat fs/namei.c:4111 [inline]
       __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
       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 (
sb_internal#3){.+.+}-{0:0}:
       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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012
       lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
       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+0x2a7/0x6f0 fs/ocfs2/journal.c:372
       ocfs2_write_begin_inline fs/ocfs2/aops.c:1482 [inline]
       ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1585 [inline]
       ocfs2_write_begin_nolock+0x2049/0x4400 fs/ocfs2/aops.c:1671
       ocfs2_write_begin+0x1b9/0x310 fs/ocfs2/aops.c:1905
       generic_perform_write+0x2b6/0x550 mm/filemap.c:3785
       __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
       ocfs2_file_write_iter+0x1670/0x1e70 fs/ocfs2/file.c:2472
       do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1
       do_iter_write+0x205/0x7b0 fs/read_write.c:855
       vfs_writev fs/read_write.c:928 [inline]
       do_pwritev+0x240/0x3a0 fs/read_write.c:1025
       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:
  sb_internal#3 --> 
&journal->j_trans_barrier --> &oi->ip_alloc_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_alloc_sem
);
                               lock(&journal->j_trans_barrier);
                               lock(&oi->ip_alloc_sem);
  lock(sb_internal#3);

 *** DEADLOCK ***

3 locks held by syz.0.312/5507:
 #0: ffff888026296460 (sb_writers#18){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline]
 #0: ffff888026296460 (sb_writers#18){.+.+}-{0:0}, at: do_pwritev+0x229/0x3a0 fs/read_write.c:1025
 #1: ffff88807238ed88 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff88807238ed88 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x436/0x1e70 fs/ocfs2/file.c:2402
 #2: ffff88807238ea20 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_write_begin+0x198/0x310 fs/ocfs2/aops.c:1903

stack backtrace:
CPU: 1 PID: 5507 Comm: syz.0.312 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 check_noncircular+0x296/0x330 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+0x2c42/0x7d10 kernel/locking/lockdep.c:5012
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 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+0x2a7/0x6f0 fs/ocfs2/journal.c:372
 ocfs2_write_begin_inline fs/ocfs2/aops.c:1482 [inline]
 ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1585 [inline]
 ocfs2_write_begin_nolock+0x2049/0x4400 fs/ocfs2/aops.c:1671
 ocfs2_write_begin+0x1b9/0x310 fs/ocfs2/aops.c:1905
 generic_perform_write+0x2b6/0x550 mm/filemap.c:3785
 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
 ocfs2_file_write_iter+0x1670/0x1e70 fs/ocfs2/file.c:2472
 do_iter_readv_writev+0x47e/0x5f0 fs/read_write.c:-1
 do_iter_write+0x205/0x7b0 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x240/0x3a0 fs/read_write.c:1025
 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: 0033:0x7f4510eea629
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:00007f450f144028 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f4511163fa0 RCX: 00007f4510eea629
RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007f4510f80b39 R08: 0000000000000000 R09: 0000000000000010
R10: 0000000000000e7b R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4511164038 R14: 00007f4511163fa0 R15: 00007ffecb8267d8
 </TASK>