======================================================
WARNING: possible circular locking dependency detected
6.1.114-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.14/3750 is trying to acquire lock:
ffff8880738b0ae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xc8/0x720 fs/gfs2/quota.c:682

but task is already holding lock:
ffff888068604fd0
 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1512 [inline]
 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x27e9/0x3ab0 fs/gfs2/bmap.c:1837

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ip->i_rw_mutex){++++}-{3:3}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       down_read+0xad/0xa30 kernel/locking/rwsem.c:1520
       __gfs2_iomap_get+0x178/0x1480 fs/gfs2/bmap.c:856
       gfs2_iomap_get+0xdb/0x150 fs/gfs2/bmap.c:1396
       bh_get+0x286/0x800 fs/gfs2/quota.c:385
       qdsb_get+0x209/0x3b0 fs/gfs2/quota.c:522
       gfs2_quota_hold+0x19d/0x5c0 fs/gfs2/quota.c:608
       punch_hole+0xebd/0x3ab0 fs/gfs2/bmap.c:1798
       __gfs2_punch_hole+0x874/0xb20 fs/gfs2/bmap.c:2452
       gfs2_fallocate+0x39d/0x490 fs/gfs2/file.c:1392
       vfs_fallocate+0x547/0x6b0 fs/open.c:323
       do_vfs_ioctl+0x222c/0x2a90 fs/ioctl.c:849
       __do_sys_ioctl fs/ioctl.c:868 [inline]
       __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&sdp->sd_quota_mutex){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
       do_qc+0xc8/0x720 fs/gfs2/quota.c:682
       gfs2_quota_change+0x2db/0x8c0 fs/gfs2/quota.c:1295
       punch_hole+0x344a/0x3ab0 fs/gfs2/bmap.c:1938
       __gfs2_punch_hole+0x874/0xb20 fs/gfs2/bmap.c:2452
       gfs2_fallocate+0x39d/0x490 fs/gfs2/file.c:1392
       vfs_fallocate+0x547/0x6b0 fs/open.c:323
       do_vfs_ioctl+0x222c/0x2a90 fs/ioctl.c:849
       __do_sys_ioctl fs/ioctl.c:868 [inline]
       __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ip->i_rw_mutex);
                               lock(&sdp->sd_quota_mutex);
                               lock(&ip->i_rw_mutex);
  lock(&sdp->sd_quota_mutex);

 *** DEADLOCK ***

5 locks held by syz.0.14/3750:
 #0: ffff88807d2b8460 (sb_writers#15){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3015 [inline]
 #0: ffff88807d2b8460 (sb_writers#15){.+.+}-{0:0}, at: vfs_fallocate+0x4ba/0x6b0 fs/open.c:322
 #1: ffff888068604b38 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff888068604b38 (&sb->s_type->i_mutex_key#23){+.+.}-{3:3}, at: gfs2_fallocate+0x198/0x490 fs/gfs2/file.c:1373
 #2: ffff88807d2b8650 (sb_internal#3){.+.+}-{0:0}, at: gfs2_trans_begin+0x6d/0xe0 fs/gfs2/trans.c:118
 #3: ffff8880738b1058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x558/0x940 fs/gfs2/trans.c:87
 #4: ffff888068604fd0 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1512 [inline]
 #4: ffff888068604fd0 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x27e9/0x3ab0 fs/gfs2/bmap.c:1837

stack backtrace:
CPU: 1 PID: 3750 Comm: syz.0.14 Not tainted 6.1.114-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 __mutex_lock_common kernel/locking/mutex.c:603 [inline]
 __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
 do_qc+0xc8/0x720 fs/gfs2/quota.c:682
 gfs2_quota_change+0x2db/0x8c0 fs/gfs2/quota.c:1295
 punch_hole+0x344a/0x3ab0 fs/gfs2/bmap.c:1938
 __gfs2_punch_hole+0x874/0xb20 fs/gfs2/bmap.c:2452
 gfs2_fallocate+0x39d/0x490 fs/gfs2/file.c:1392
 vfs_fallocate+0x547/0x6b0 fs/open.c:323
 do_vfs_ioctl+0x222c/0x2a90 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl+0x81/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f280f17dff9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f280fed9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f280f335f80 RCX: 00007f280f17dff9
RDX: 0000000020000280 RSI: 000000004030582b RDI: 0000000000000004
RBP: 00007f280f1f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f280f335f80 R15: 00007ffe2d782808
 </TASK>