======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/4568 is trying to acquire lock:
ffff0000e155cae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xc0/0x658 fs/gfs2/quota.c:682

but task is already holding lock:
ffff0000e9b085e8 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1529 [inline]
ffff0000e9b085e8 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x222c/0x3018 fs/gfs2/bmap.c:1854

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+0x64/0x300 kernel/locking/rwsem.c:1520
       __gfs2_iomap_get+0x118/0x10fc fs/gfs2/bmap.c:862
       gfs2_iomap_get+0xd4/0x144 fs/gfs2/bmap.c:1413
       bh_get+0x1e8/0x608 fs/gfs2/quota.c:385
       qdsb_get+0x1c4/0x370 fs/gfs2/quota.c:522
       gfs2_quota_hold+0x16c/0x550 fs/gfs2/quota.c:608
       punch_hole+0xc20/0x3018 fs/gfs2/bmap.c:1815
       gfs2_file_dealloc+0x28/0x38 fs/gfs2/bmap.c:2177
       evict_unlinked_inode+0x190/0x608 fs/gfs2/super.c:1399
       gfs2_evict_inode+0x560/0xe5c fs/gfs2/super.c:1498
       evict+0x3d8/0x81c fs/inode.c:703
       iput_final fs/inode.c:1832 [inline]
       iput+0x728/0x7e8 fs/inode.c:1858
       dentry_unlink_inode+0x360/0x438 fs/dcache.c:405
       __dentry_kill+0x318/0x590 fs/dcache.c:611
       dentry_kill+0xcc/0x24c fs/dcache.c:-1
       dput+0x228/0x444 fs/dcache.c:918
       __fput+0x480/0x7b0 fs/file_table.c:328
       ____fput+0x20/0x30 fs/file_table.c:348
       task_work_run+0x1f4/0x280 kernel/task_work.c:203
       exit_task_work include/linux/task_work.h:39 [inline]
       do_exit+0x54c/0x19ac kernel/exit.c:887
       do_group_exit+0x198/0x238 kernel/exit.c:1030
       get_signal+0x11f4/0x133c kernel/signal.c:2884
       do_signal arch/arm64/kernel/signal.c:1110 [inline]
       do_notify_resume+0x2a8/0x2c84 arch/arm64/kernel/signal.c:1163
       prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
       exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
       el0_da+0xbc/0x14c arch/arm64/kernel/entry-common.c:516
       el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589

-> #0 (&sdp->sd_quota_mutex){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3162 [inline]
       check_prevs_add kernel/locking/lockdep.c:3281 [inline]
       validate_chain kernel/locking/lockdep.c:3897 [inline]
       __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171
       lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790
       __mutex_lock_common+0x1a0/0x1f88 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
       do_qc+0xc0/0x658 fs/gfs2/quota.c:682
       gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295
       punch_hole+0x2ac0/0x3018 fs/gfs2/bmap.c:1955
       gfs2_file_dealloc+0x28/0x38 fs/gfs2/bmap.c:2177
       evict_unlinked_inode+0x190/0x608 fs/gfs2/super.c:1399
       gfs2_evict_inode+0x560/0xe5c fs/gfs2/super.c:1498
       evict+0x3d8/0x81c fs/inode.c:703
       iput_final fs/inode.c:1832 [inline]
       iput+0x728/0x7e8 fs/inode.c:1858
       dentry_unlink_inode+0x360/0x438 fs/dcache.c:405
       __dentry_kill+0x318/0x590 fs/dcache.c:611
       dentry_kill+0xcc/0x24c fs/dcache.c:-1
       dput+0x228/0x444 fs/dcache.c:918
       __fput+0x480/0x7b0 fs/file_table.c:328
       ____fput+0x20/0x30 fs/file_table.c:348
       task_work_run+0x1f4/0x280 kernel/task_work.c:203
       exit_task_work include/linux/task_work.h:39 [inline]
       do_exit+0x54c/0x19ac kernel/exit.c:887
       do_group_exit+0x198/0x238 kernel/exit.c:1030
       get_signal+0x11f4/0x133c kernel/signal.c:2884
       do_signal arch/arm64/kernel/signal.c:1110 [inline]
       do_notify_resume+0x2a8/0x2c84 arch/arm64/kernel/signal.c:1163
       prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
       exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
       el0_da+0xbc/0x14c arch/arm64/kernel/entry-common.c:516
       el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589

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 ***

3 locks held by syz.0.17/4568:
 #0: ffff0000d498e650 (sb_internal#2){.+.+}-{0:0}, at: gfs2_trans_begin+0xa8/0x114 fs/gfs2/trans.c:118
 #1: ffff0000e155d058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x50c/0x884 fs/gfs2/trans.c:87
 #2: ffff0000e9b085e8 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1529 [inline]
 #2: ffff0000e9b085e8 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x222c/0x3018 fs/gfs2/bmap.c:1854

stack backtrace:
CPU: 0 PID: 4568 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026
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:2088
 check_noncircular+0x290/0x370 kernel/locking/lockdep.c:2215
 check_prev_add kernel/locking/lockdep.c:3162 [inline]
 check_prevs_add kernel/locking/lockdep.c:3281 [inline]
 validate_chain kernel/locking/lockdep.c:3897 [inline]
 __lock_acquire+0x3504/0x7280 kernel/locking/lockdep.c:5171
 lock_acquire+0x210/0x63c kernel/locking/lockdep.c:5790
 __mutex_lock_common+0x1a0/0x1f88 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 do_qc+0xc0/0x658 fs/gfs2/quota.c:682
 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295
 punch_hole+0x2ac0/0x3018 fs/gfs2/bmap.c:1955
 gfs2_file_dealloc+0x28/0x38 fs/gfs2/bmap.c:2177
 evict_unlinked_inode+0x190/0x608 fs/gfs2/super.c:1399
 gfs2_evict_inode+0x560/0xe5c fs/gfs2/super.c:1498
 evict+0x3d8/0x81c fs/inode.c:703
 iput_final fs/inode.c:1832 [inline]
 iput+0x728/0x7e8 fs/inode.c:1858
 dentry_unlink_inode+0x360/0x438 fs/dcache.c:405
 __dentry_kill+0x318/0x590 fs/dcache.c:611
 dentry_kill+0xcc/0x24c fs/dcache.c:-1
 dput+0x228/0x444 fs/dcache.c:918
 __fput+0x480/0x7b0 fs/file_table.c:328
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x54c/0x19ac kernel/exit.c:887
 do_group_exit+0x198/0x238 kernel/exit.c:1030
 get_signal+0x11f4/0x133c kernel/signal.c:2884
 do_signal arch/arm64/kernel/signal.c:1110 [inline]
 do_notify_resume+0x2a8/0x2c84 arch/arm64/kernel/signal.c:1163
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_da+0xbc/0x14c arch/arm64/kernel/entry-common.c:516
 el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589