=======================================================
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.0.17/4519 is trying to acquire lock:
ffff0000f2813f60 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xb4/0x2e4 fs/ocfs2/refcounttree.c:932

but task is already holding lock:
ffff0000f2813ff8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xa8/0x2e4 fs/ocfs2/refcounttree.c:931

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_xattr_sem){++++}-{3:3}:
       down_read+0x64/0x300 kernel/locking/rwsem.c:1520
       ocfs2_init_acl+0x264/0x61c fs/ocfs2/acl.c:365
       ocfs2_mknod+0x12b0/0x218c fs/ocfs2/namei.c:410
       ocfs2_create+0x19c/0x51c fs/ocfs2/namei.c:674
       lookup_open fs/namei.c:3490 [inline]
       open_last_lookups fs/namei.c:3558 [inline]
       path_openat+0xda8/0x27a0 fs/namei.c:3788
       do_filp_open+0x198/0x38c fs/namei.c:3818
       do_sys_openat2+0x134/0x3fc fs/open.c:1320
       do_sys_open fs/open.c:1336 [inline]
       __do_sys_openat fs/open.c:1352 [inline]
       __se_sys_openat fs/open.c:1347 [inline]
       __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #2 (&journal->j_trans_barrier){.+.+}-{3:3}:
       down_read+0x64/0x300 kernel/locking/rwsem.c:1520
       ocfs2_start_trans+0x38c/0x6f4 fs/ocfs2/journal.c:374
       ocfs2_mknod+0xd2c/0x218c fs/ocfs2/namei.c:361
       ocfs2_create+0x19c/0x51c fs/ocfs2/namei.c:674
       lookup_open fs/namei.c:3490 [inline]
       open_last_lookups fs/namei.c:3558 [inline]
       path_openat+0xda8/0x27a0 fs/namei.c:3788
       do_filp_open+0x198/0x38c fs/namei.c:3818
       do_sys_openat2+0x134/0x3fc fs/open.c:1320
       do_sys_open fs/open.c:1336 [inline]
       __do_sys_openat fs/open.c:1352 [inline]
       __se_sys_openat fs/open.c:1347 [inline]
       __arm64_sys_openat+0x11c/0x150 fs/open.c:1347
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #1 (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+0x20c/0x6f4 fs/ocfs2/journal.c:372
       ocfs2_write_begin_inline fs/ocfs2/aops.c:1483 [inline]
       ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1586 [inline]
       ocfs2_write_begin_nolock+0x8fc/0x3a80 fs/ocfs2/aops.c:1672
       ocfs2_write_begin+0x1b4/0x318 fs/ocfs2/aops.c:1906
       generic_perform_write+0x240/0x508 mm/filemap.c:3862
       __generic_file_write_iter+0x130/0x250 mm/filemap.c:3960
       ocfs2_file_write_iter+0x13ac/0x1cd0 fs/ocfs2/file.c:2469
       call_write_iter include/linux/fs.h:2265 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x3c8/0x7c8 fs/read_write.c:584
       ksys_write+0x12c/0x228 fs/read_write.c:637
       __do_sys_write fs/read_write.c:649 [inline]
       __se_sys_write fs/read_write.c:646 [inline]
       __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #0 (&oi->ip_alloc_sem){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3095 [inline]
       check_prevs_add kernel/locking/lockdep.c:3214 [inline]
       validate_chain kernel/locking/lockdep.c:3830 [inline]
       __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063
       lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
       down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
       ocfs2_try_remove_refcount_tree+0xb4/0x2e4 fs/ocfs2/refcounttree.c:932
       ocfs2_truncate_file+0xce0/0x14dc fs/ocfs2/file.c:517
       ocfs2_setattr+0x12a0/0x1950 fs/ocfs2/file.c:1212
       notify_change+0xb5c/0xe20 fs/attr.c:499
       do_truncate+0x188/0x20c fs/open.c:65
       do_sys_ftruncate+0x284/0x318 fs/open.c:193
       __do_sys_ftruncate fs/open.c:204 [inline]
       __se_sys_ftruncate fs/open.c:202 [inline]
       __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

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.0.17/4519:
 #0: ffff0000defbc460 (sb_writers#12){.+.+}-{0:0}, at: do_sys_ftruncate+0x210/0x318 fs/open.c:190
 #1: ffff0000f28142c8 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff0000f28142c8 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: do_truncate+0x174/0x20c fs/open.c:63
 #2: ffff0000f2813ff8 (&oi->ip_xattr_sem){++++}-{3:3}, at: ocfs2_try_remove_refcount_tree+0xa8/0x2e4 fs/ocfs2/refcounttree.c:931

stack backtrace:
CPU: 1 PID: 4519 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048
 check_noncircular+0x264/0x2f8 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3095 [inline]
 check_prevs_add kernel/locking/lockdep.c:3214 [inline]
 validate_chain kernel/locking/lockdep.c:3830 [inline]
 __lock_acquire+0x2808/0x6634 kernel/locking/lockdep.c:5063
 lock_acquire+0x20c/0x638 kernel/locking/lockdep.c:5676
 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573
 ocfs2_try_remove_refcount_tree+0xb4/0x2e4 fs/ocfs2/refcounttree.c:932
 ocfs2_truncate_file+0xce0/0x14dc fs/ocfs2/file.c:517
 ocfs2_setattr+0x12a0/0x1950 fs/ocfs2/file.c:1212
 notify_change+0xb5c/0xe20 fs/attr.c:499
 do_truncate+0x188/0x20c fs/open.c:65
 do_sys_ftruncate+0x284/0x318 fs/open.c:193
 __do_sys_ftruncate fs/open.c:204 [inline]
 __se_sys_ftruncate fs/open.c:202 [inline]
 __arm64_sys_ftruncate+0x60/0x74 fs/open.c:202
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585