======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc7-syzkaller-gc912bf709078 #0 Not tainted
------------------------------------------------------
syz.0.1/6517 is trying to acquire lock:
ffff0000cce60ae8 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xac/0x5c8 fs/gfs2/quota.c:720

but task is already holding lock:
ffff0000efd1a0c8 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1529 [inline]
ffff0000efd1a0c8 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1f58/0x2f6c fs/gfs2/bmap.c:1853

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ip->i_rw_mutex){++++}-{3:3}:
       down_read+0x58/0x2fc kernel/locking/rwsem.c:1526
       __gfs2_iomap_get+0x124/0x102c fs/gfs2/bmap.c:859
       gfs2_iomap_get+0xd8/0x154 fs/gfs2/bmap.c:1413
       bh_get+0x1ec/0x688 fs/gfs2/quota.c:417
       qdsb_get+0x1c8/0x30c fs/gfs2/quota.c:566
       gfs2_quota_hold+0x16c/0x560 fs/gfs2/quota.c:646
       punch_hole+0xc10/0x2f6c fs/gfs2/bmap.c:1814
       do_shrink fs/gfs2/bmap.c:2034 [inline]
       gfs2_setattr_size+0xb04/0xdc8 fs/gfs2/bmap.c:2150
       gfs2_setattr+0x218/0x390 fs/gfs2/inode.c:2025
       notify_change+0x9d4/0xc84 fs/attr.c:497
       do_truncate+0x1c0/0x28c fs/open.c:65
       handle_truncate fs/namei.c:3355 [inline]
       do_open fs/namei.c:3705 [inline]
       path_openat+0x2428/0x2ae8 fs/namei.c:3860
       do_filp_open+0x1bc/0x3cc fs/namei.c:3887
       do_sys_openat2+0x124/0x1b8 fs/open.c:1413
       do_sys_open fs/open.c:1428 [inline]
       __do_sys_openat fs/open.c:1444 [inline]
       __se_sys_openat fs/open.c:1439 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1439
       __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
       el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
       el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

-> #0 (&sdp->sd_quota_mutex){+.+.}-{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+0x3384/0x763c kernel/locking/lockdep.c:5137
       lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5754
       __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608
       __mutex_lock kernel/locking/mutex.c:752 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
       do_qc+0xac/0x5c8 fs/gfs2/quota.c:720
       gfs2_quota_change+0x238/0x728 fs/gfs2/quota.c:1315
       punch_hole+0x2a28/0x2f6c fs/gfs2/bmap.c:1954
       do_shrink fs/gfs2/bmap.c:2034 [inline]
       gfs2_setattr_size+0xb04/0xdc8 fs/gfs2/bmap.c:2150
       gfs2_setattr+0x218/0x390 fs/gfs2/inode.c:2025
       notify_change+0x9d4/0xc84 fs/attr.c:497
       do_truncate+0x1c0/0x28c fs/open.c:65
       handle_truncate fs/namei.c:3355 [inline]
       do_open fs/namei.c:3705 [inline]
       path_openat+0x2428/0x2ae8 fs/namei.c:3860
       do_filp_open+0x1bc/0x3cc fs/namei.c:3887
       do_sys_openat2+0x124/0x1b8 fs/open.c:1413
       do_sys_open fs/open.c:1428 [inline]
       __do_sys_openat fs/open.c:1444 [inline]
       __se_sys_openat fs/open.c:1439 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1439
       __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
       el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
       do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
       el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
       el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

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.0.1/6517:
 #0: ffff0000d2044420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:409
 #1: ffff0000efd19c30 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:791 [inline]
 #1: ffff0000efd19c30 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: do_truncate+0x1ac/0x28c fs/open.c:63
 #2: ffff0000d2044610 (sb_internal#3){.+.+}-{0:0}, at: gfs2_trans_begin+0x8c/0x100 fs/gfs2/trans.c:118
 #3: ffff0000cce61060 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x510/0x908 fs/gfs2/trans.c:87
 #4: ffff0000efd1a0c8 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1529 [inline]
 #4: ffff0000efd1a0c8 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1f58/0x2f6c fs/gfs2/bmap.c:1853

stack backtrace:
CPU: 1 PID: 6517 Comm: syz.0.1 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 dump_stack+0x1c/0x28 lib/dump_stack.c:123
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2060
 check_noncircular+0x310/0x404 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+0x3384/0x763c kernel/locking/lockdep.c:5137
 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5754
 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608
 __mutex_lock kernel/locking/mutex.c:752 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
 do_qc+0xac/0x5c8 fs/gfs2/quota.c:720
 gfs2_quota_change+0x238/0x728 fs/gfs2/quota.c:1315
 punch_hole+0x2a28/0x2f6c fs/gfs2/bmap.c:1954
 do_shrink fs/gfs2/bmap.c:2034 [inline]
 gfs2_setattr_size+0xb04/0xdc8 fs/gfs2/bmap.c:2150
 gfs2_setattr+0x218/0x390 fs/gfs2/inode.c:2025
 notify_change+0x9d4/0xc84 fs/attr.c:497
 do_truncate+0x1c0/0x28c fs/open.c:65
 handle_truncate fs/namei.c:3355 [inline]
 do_open fs/namei.c:3705 [inline]
 path_openat+0x2428/0x2ae8 fs/namei.c:3860
 do_filp_open+0x1bc/0x3cc fs/namei.c:3887
 do_sys_openat2+0x124/0x1b8 fs/open.c:1413
 do_sys_open fs/open.c:1428 [inline]
 __do_sys_openat fs/open.c:1444 [inline]
 __se_sys_openat fs/open.c:1439 [inline]
 __arm64_sys_openat+0x1f0/0x240 fs/open.c:1439
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598