syzbot

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.0.17/5926 is trying to acquire lock:
ffff88805d93d118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
ffff88805d93d118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: __ocfs2_flush_truncate_log+0x352/0x1130 fs/ocfs2/alloc.c:6046

but task is already holding lock:
ffff88805d9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
ffff88805d9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6075 [inline]
ffff88805d9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: ocfs2_try_to_free_truncate_log+0x1a1/0x360 fs/ocfs2/alloc.c:6135

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}:
       down_write+0x97/0x200 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:804 [inline]
       ocfs2_move_extent fs/ocfs2/move_extents.c:646 [inline]
       __ocfs2_move_extents_range+0x1a63/0x35d0 fs/ocfs2/move_extents.c:866
       ocfs2_move_extents+0x3a7/0x9a0 fs/ocfs2/move_extents.c:938
       ocfs2_ioctl_move_extents+0x527/0x6c0 fs/ocfs2/move_extents.c:1064
       ocfs2_ioctl+0x199/0x7e0 fs/ocfs2/ioctl.c:945
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:871 [inline]
       __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
       down_write+0x97/0x200 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:804 [inline]
       __ocfs2_flush_truncate_log+0x352/0x1130 fs/ocfs2/alloc.c:6046
       ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6076 [inline]
       ocfs2_try_to_free_truncate_log+0x1a9/0x360 fs/ocfs2/alloc.c:6135
       ocfs2_reserve_clusters_with_limit+0x48e/0xc20 fs/ocfs2/suballoc.c:1180
       ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline]
       ocfs2_lock_allocators+0x2d9/0x5f0 fs/ocfs2/suballoc.c:2679
       ocfs2_write_begin_nolock+0x1b2b/0x43f0 fs/ocfs2/aops.c:1740
       ocfs2_dio_wr_get_block+0xbba/0x1820 fs/ocfs2/aops.c:2239
       get_more_blocks fs/direct-io.c:647 [inline]
       do_direct_IO fs/direct-io.c:935 [inline]
       __blockdev_direct_IO+0x1775/0x3500 fs/direct-io.c:1248
       ocfs2_direct_IO+0x235/0x2a0 fs/ocfs2/aops.c:2468
       generic_file_direct_write+0x1d4/0x3e0 mm/filemap.c:3956
       __generic_file_write_iter+0x11b/0x230 mm/filemap.c:4112
       ocfs2_file_write_iter+0x167a/0x1e80 fs/ocfs2/file.c:2468
       do_iter_readv_writev fs/read_write.c:-1 [inline]
       do_iter_write+0x738/0xc30 fs/read_write.c:860
       iter_file_splice_write+0x6a3/0xcb0 fs/splice.c:736
       do_splice_from fs/splice.c:933 [inline]
       direct_splice_actor+0xe8/0x130 fs/splice.c:1142
       splice_direct_to_actor+0x304/0x8c0 fs/splice.c:1088
       do_splice_direct+0x1d5/0x2f0 fs/splice.c:1194
       do_sendfile+0x5f2/0xef0 fs/read_write.c:1254
       __do_sys_sendfile64 fs/read_write.c:1322 [inline]
       __se_sys_sendfile64+0x145/0x1a0 fs/read_write.c:1308
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6);
  lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5);

 *** DEADLOCK ***

4 locks held by syz.0.17/5926:
 #0: ffff88802bbbe418 (sb_writers#13){.+.+}-{0:0}, at: do_sendfile+0x5cf/0xef0 fs/read_write.c:1253
 #1: ffff88805d9c42d8 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #1: ffff88805d9c42d8 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: ocfs2_file_write_iter+0x440/0x1e80 fs/ocfs2/file.c:2398
 #2: ffff88805d9c3f60 (&oi->ip_alloc_sem){++++}-{3:3}, at: ocfs2_dio_wr_get_block+0x908/0x1820 fs/ocfs2/aops.c:2225
 #3: ffff88805d9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #3: ffff88805d9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6075 [inline]
 #3: ffff88805d9c3498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: ocfs2_try_to_free_truncate_log+0x1a1/0x360 fs/ocfs2/alloc.c:6135

stack backtrace:
CPU: 0 PID: 5926 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 down_write+0x97/0x200 kernel/locking/rwsem.c:1573
 inode_lock include/linux/fs.h:804 [inline]
 __ocfs2_flush_truncate_log+0x352/0x1130 fs/ocfs2/alloc.c:6046
 ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6076 [inline]
 ocfs2_try_to_free_truncate_log+0x1a9/0x360 fs/ocfs2/alloc.c:6135
 ocfs2_reserve_clusters_with_limit+0x48e/0xc20 fs/ocfs2/suballoc.c:1180
 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline]
 ocfs2_lock_allocators+0x2d9/0x5f0 fs/ocfs2/suballoc.c:2679
 ocfs2_write_begin_nolock+0x1b2b/0x43f0 fs/ocfs2/aops.c:1740
 ocfs2_dio_wr_get_block+0xbba/0x1820 fs/ocfs2/aops.c:2239
 get_more_blocks fs/direct-io.c:647 [inline]
 do_direct_IO fs/direct-io.c:935 [inline]
 __blockdev_direct_IO+0x1775/0x3500 fs/direct-io.c:1248
 ocfs2_direct_IO+0x235/0x2a0 fs/ocfs2/aops.c:2468
 generic_file_direct_write+0x1d4/0x3e0 mm/filemap.c:3956
 __generic_file_write_iter+0x11b/0x230 mm/filemap.c:4112
 ocfs2_file_write_iter+0x167a/0x1e80 fs/ocfs2/file.c:2468
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x738/0xc30 fs/read_write.c:860
 iter_file_splice_write+0x6a3/0xcb0 fs/splice.c:736
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0xe8/0x130 fs/splice.c:1142
 splice_direct_to_actor+0x304/0x8c0 fs/splice.c:1088
 do_splice_direct+0x1d5/0x2f0 fs/splice.c:1194
 do_sendfile+0x5f2/0xef0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64+0x145/0x1a0 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f844d59bf79
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:00007f844e394028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f844d815fa0 RCX: 00007f844d59bf79
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007f844d6327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f844d816038 R14: 00007f844d815fa0 R15: 00007fff85dd6a08
 </TASK>
syz.0.17 (5926) used greatest stack depth: 17640 bytes left