======================================================
WARNING: possible circular locking dependency detected
6.1.119-syzkaller #0 Not tainted
------------------------------------------------------
syz.5.448/7567 is trying to acquire lock:
ffff000100240ae0 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xbc/0x664 fs/gfs2/quota.c:682

but task is already holding lock:
ffff0000e254cfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x210/0x17a0 fs/gfs2/bmap.c:679

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+0x64/0x308 kernel/locking/rwsem.c:1520
       __gfs2_iomap_get+0x138/0x1058 fs/gfs2/bmap.c:856
       gfs2_iomap_get+0xd8/0x154 fs/gfs2/bmap.c:1396
       bh_get+0x208/0x6ac fs/gfs2/quota.c:385
       qdsb_get+0x1e0/0x398 fs/gfs2/quota.c:522
       gfs2_quota_hold+0x16c/0x558 fs/gfs2/quota.c:608
       gfs2_quota_lock+0xbc/0x404 fs/gfs2/quota.c:1076
       gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline]
       alloc_dinode+0x180/0x478 fs/gfs2/inode.c:393
       gfs2_create_inode+0xc58/0x1548 fs/gfs2/inode.c:711
       gfs2_atomic_open+0xd8/0x1c4 fs/gfs2/inode.c:1292
       atomic_open fs/namei.c:3345 [inline]
       lookup_open fs/namei.c:3453 [inline]
       open_last_lookups fs/namei.c:3550 [inline]
       path_openat+0xbf8/0x2548 fs/namei.c:3780
       do_filp_open+0x1bc/0x3cc fs/namei.c:3810
       do_sys_openat2+0x128/0x3e0 fs/open.c:1318
       do_sys_open fs/open.c:1334 [inline]
       __do_sys_openat fs/open.c:1350 [inline]
       __se_sys_openat fs/open.c:1345 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #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 kernel/locking/lockdep.c:3825 [inline]
       __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
       lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
       __mutex_lock_common+0x190/0x21a0 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+0xbc/0x664 fs/gfs2/quota.c:682
       gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295
       gfs2_alloc_blocks+0x174c/0x207c fs/gfs2/rgrp.c:2494
       __gfs2_iomap_alloc+0x3b8/0x17a0 fs/gfs2/bmap.c:705
       gfs2_iomap_alloc+0x138/0x1d0 fs/gfs2/bmap.c:1409
       gfs2_allocate_page_backing+0x10c/0x204 fs/gfs2/file.c:394
       gfs2_page_mkwrite+0x12c4/0x179c fs/gfs2/file.c:524
       do_page_mkwrite+0x144/0x37c mm/memory.c:3009
       do_shared_fault mm/memory.c:4694 [inline]
       do_fault mm/memory.c:4762 [inline]
       handle_pte_fault mm/memory.c:5029 [inline]
       __handle_mm_fault mm/memory.c:5171 [inline]
       handle_mm_fault+0x1824/0x3d38 mm/memory.c:5292
       __do_page_fault arch/arm64/mm/fault.c:499 [inline]
       do_page_fault+0x330/0x890 arch/arm64/mm/fault.c:583
       do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:667
       do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:803
       el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
       el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427
       el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580
       __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:217 [inline]
       __sys_socketpair+0x204/0x7a4 net/socket.c:1720
       __do_sys_socketpair net/socket.c:1786 [inline]
       __se_sys_socketpair net/socket.c:1783 [inline]
       __arm64_sys_socketpair+0x9c/0xb8 net/socket.c:1783
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

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.5.448/7567:
 #0: ffff0000d5956748 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
 #0: ffff0000d5956748 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5320 [inline]
 #0: ffff0000d5956748 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x38/0x2e8 mm/memory.c:5382
 #1: ffff0000dffe0558 (sb_pagefaults#3){.+.+}-{0:0}, at: do_page_mkwrite+0x144/0x37c mm/memory.c:3009
 #2: ffff0000dffe0650 (sb_internal#7){.+.+}-{0:0}, at: gfs2_trans_begin+0xa8/0x11c fs/gfs2/trans.c:118
 #3: ffff000100241058 (&sdp->sd_log_flush_lock){.+.+}-{3:3}, at: __gfs2_trans_begin+0x524/0x91c fs/gfs2/trans.c:87
 #4: ffff0000e254cfd0 (&ip->i_rw_mutex){++++}-{3:3}, at: __gfs2_iomap_alloc+0x210/0x17a0 fs/gfs2/bmap.c:679

stack backtrace:
CPU: 1 PID: 7567 Comm: syz.5.448 Not tainted 6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048
 check_noncircular+0x2cc/0x378 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 kernel/locking/lockdep.c:3825 [inline]
 __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
 __mutex_lock_common+0x190/0x21a0 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+0xbc/0x664 fs/gfs2/quota.c:682
 gfs2_quota_change+0x238/0x718 fs/gfs2/quota.c:1295
 gfs2_alloc_blocks+0x174c/0x207c fs/gfs2/rgrp.c:2494
 __gfs2_iomap_alloc+0x3b8/0x17a0 fs/gfs2/bmap.c:705
 gfs2_iomap_alloc+0x138/0x1d0 fs/gfs2/bmap.c:1409
 gfs2_allocate_page_backing+0x10c/0x204 fs/gfs2/file.c:394
 gfs2_page_mkwrite+0x12c4/0x179c fs/gfs2/file.c:524
 do_page_mkwrite+0x144/0x37c mm/memory.c:3009
 do_shared_fault mm/memory.c:4694 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x1824/0x3d38 mm/memory.c:5292
 __do_page_fault arch/arm64/mm/fault.c:499 [inline]
 do_page_fault+0x330/0x890 arch/arm64/mm/fault.c:583
 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:667
 do_mem_abort+0x74/0x200 arch/arm64/mm/fault.c:803
 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367
 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:580
 __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:217 [inline]
 __sys_socketpair+0x204/0x7a4 net/socket.c:1720
 __do_sys_socketpair net/socket.c:1786 [inline]
 __se_sys_socketpair net/socket.c:1783 [inline]
 __arm64_sys_socketpair+0x9c/0xb8 net/socket.c:1783
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585