loop0: detected capacity change from 0 to 32768
=======================================================
WARNING: The mand mount option has been deprecated and
         and is ignored by this kernel. Remove the mand
         option from the mount to silence this warning.
=======================================================
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.0.0/5318 is trying to acquire lock:
ffff88804435dda0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
ffff88804435dda0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: _ocfs2_reclaim_suballoc_to_main fs/ocfs2/suballoc.c:2804 [inline]
ffff88804435dda0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: _ocfs2_free_suballoc_bits+0x1510/0x27a0 fs/ocfs2/suballoc.c:2958

but task is already holding lock:
ffff888013ed20e0 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ae/0x700 fs/ocfs2/journal.c:369

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x4a/0x330 kernel/locking/rwsem.c:1574
       ocfs2_start_trans+0x3ae/0x700 fs/ocfs2/journal.c:369
       ocfs2_block_group_alloc fs/ocfs2/suballoc.c:801 [inline]
       ocfs2_reserve_suballoc_bits+0x7b7/0x4850 fs/ocfs2/suballoc.c:950
       ocfs2_reserve_new_inode+0x4f8/0xd10 fs/ocfs2/suballoc.c:1190
       ocfs2_mknod+0x888/0x21a0 fs/ocfs2/namei.c:308
       vfs_mknod+0x441/0x600 fs/namei.c:5298
       filename_mknodat+0x3cb/0x660 fs/namei.c:-1
       __do_sys_mknodat fs/namei.c:5379 [inline]
       __se_sys_mknodat+0x3b/0x150 fs/namei.c:5375
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       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:367
       ocfs2_block_group_alloc fs/ocfs2/suballoc.c:801 [inline]
       ocfs2_reserve_suballoc_bits+0x7b7/0x4850 fs/ocfs2/suballoc.c:950
       ocfs2_reserve_new_inode+0x4f8/0xd10 fs/ocfs2/suballoc.c:1190
       ocfs2_mknod+0x888/0x21a0 fs/ocfs2/namei.c:308
       vfs_mknod+0x441/0x600 fs/namei.c:5298
       filename_mknodat+0x3cb/0x660 fs/namei.c:-1
       __do_sys_mknodat fs/namei.c:5379 [inline]
       __se_sys_mknodat+0x3b/0x150 fs/namei.c:5375
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3209 [inline]
       check_prevs_add kernel/locking/lockdep.c:3328 [inline]
       validate_chain kernel/locking/lockdep.c:3952 [inline]
       __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
       lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
       down_write+0x96/0x200 kernel/locking/rwsem.c:1631
       inode_lock include/linux/fs.h:1024 [inline]
       _ocfs2_reclaim_suballoc_to_main fs/ocfs2/suballoc.c:2804 [inline]
       _ocfs2_free_suballoc_bits+0x1510/0x27a0 fs/ocfs2/suballoc.c:2958
       ocfs2_free_suballoc_bits fs/ocfs2/suballoc.c:2972 [inline]
       ocfs2_free_dinode+0xb1/0xe0 fs/ocfs2/suballoc.c:2987
       ocfs2_remove_inode fs/ocfs2/inode.c:808 [inline]
       ocfs2_wipe_inode fs/ocfs2/inode.c:930 [inline]
       ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
       ocfs2_evict_inode+0x1dee/0x4390 fs/ocfs2/inode.c:1333
       evict+0x624/0xb50 fs/inode.c:822
       filename_unlinkat+0x43f/0x610 fs/namei.c:5752
       __do_sys_unlinkat fs/namei.c:5777 [inline]
       __se_sys_unlinkat+0x83/0x1a0 fs/namei.c:5769
       do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
       do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE] --> sb_internal#2 --> &journal->j_trans_barrier

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&journal->j_trans_barrier);
                               lock(sb_internal#2);
                               lock(&journal->j_trans_barrier);
  lock(&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]);

 *** DEADLOCK ***

locks held by syz.0.0/5318: 7, last CPU#0:
 #0: ffff888031774460 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:527
 #1: ffff8880138d0bc0 (&osb->nfs_sync_rwlock){.+.+}-{4:4}, at: ocfs2_nfs_sync_lock+0x106/0x270 fs/ocfs2/dlmglue.c:2875
 #2: ffff88804435cfa0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #2: ffff88804435cfa0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:888 [inline]
 #2: ffff88804435cfa0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
 #2: ffff88804435cfa0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0xe39/0x4390 fs/ocfs2/inode.c:1333
 #3: ffff88804435b3a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #3: ffff88804435b3a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_remove_inode fs/ocfs2/inode.c:767 [inline]
 #3: ffff88804435b3a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:930 [inline]
 #3: ffff88804435b3a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
 #3: ffff88804435b3a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0x1489/0x4390 fs/ocfs2/inode.c:1333
 #4: ffff888031774650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_remove_inode fs/ocfs2/inode.c:776 [inline]
 #4: ffff888031774650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_wipe_inode fs/ocfs2/inode.c:930 [inline]
 #4: ffff888031774650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
 #4: ffff888031774650 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_evict_inode+0x156b/0x4390 fs/ocfs2/inode.c:1333
 #5: ffff888013ed20e0 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ae/0x700 fs/ocfs2/journal.c:369
 #6: ffff888035c32938 (jbd2_handle#2){.+.+}-{0:0}, at: start_this_handle+0x1fbf/0x2200 fs/jbd2/transaction.c:444

stack backtrace:
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2087
 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2219
 check_prev_add kernel/locking/lockdep.c:3209 [inline]
 check_prevs_add kernel/locking/lockdep.c:3328 [inline]
 validate_chain kernel/locking/lockdep.c:3952 [inline]
 __lock_acquire+0x164c/0x2de0 kernel/locking/lockdep.c:5288
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 down_write+0x96/0x200 kernel/locking/rwsem.c:1631
 inode_lock include/linux/fs.h:1024 [inline]
 _ocfs2_reclaim_suballoc_to_main fs/ocfs2/suballoc.c:2804 [inline]
 _ocfs2_free_suballoc_bits+0x1510/0x27a0 fs/ocfs2/suballoc.c:2958
 ocfs2_free_suballoc_bits fs/ocfs2/suballoc.c:2972 [inline]
 ocfs2_free_dinode+0xb1/0xe0 fs/ocfs2/suballoc.c:2987
 ocfs2_remove_inode fs/ocfs2/inode.c:808 [inline]
 ocfs2_wipe_inode fs/ocfs2/inode.c:930 [inline]
 ocfs2_delete_inode fs/ocfs2/inode.c:1191 [inline]
 ocfs2_evict_inode+0x1dee/0x4390 fs/ocfs2/inode.c:1333
 evict+0x624/0xb50 fs/inode.c:822
 filename_unlinkat+0x43f/0x610 fs/namei.c:5752
 __do_sys_unlinkat fs/namei.c:5777 [inline]
 __se_sys_unlinkat+0x83/0x1a0 fs/namei.c:5769
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2bee39e2d9
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:00007f2bef1ddfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007f2bee625fa0 RCX: 00007f2bee39e2d9
RDX: 0000000000000000 RSI: 0000200000000d40 RDI: ffffffffffffff9c
RBP: 00007f2bee435888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2bee626038 R14: 00007f2bee625fa0 R15: 00007ffc580242b8
 </TASK>