loop5: detected capacity change from 32768 to 64
======================================================
WARNING: possible circular locking dependency detected
6.6.101-syzkaller #0 Not tainted
------------------------------------------------------
syz.5.45/6311 is trying to acquire lock:
ffff88807f840ae8 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xaf/0x670 fs/gfs2/quota.c:689
but task is already holding lock:
ffff888058a734f0 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1526 [inline]
ffff888058a734f0 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1c7d/0x2d70 fs/gfs2/bmap.c:1850
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+0x46/0x2e0 kernel/locking/rwsem.c:1520
__gfs2_iomap_get+0x159/0x13f0 fs/gfs2/bmap.c:856
gfs2_iomap_get+0xc5/0x120 fs/gfs2/bmap.c:1410
bh_get+0x225/0x710 fs/gfs2/quota.c:401
qd_fish fs/gfs2/quota.c:496 [inline]
gfs2_quota_sync+0x33a/0x5a0 fs/gfs2/quota.c:1335
gfs2_sync_fs+0x4c/0xb0 fs/gfs2/super.c:670
sync_filesystem+0xea/0x220 fs/sync.c:56
generic_shutdown_super+0x6f/0x2b0 fs/super.c:666
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250
task_work_run+0x1ce/0x250 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #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+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747
do_qc+0xaf/0x670 fs/gfs2/quota.c:689
gfs2_quota_change+0x2b9/0x800 fs/gfs2/quota.c:1289
punch_hole+0x280c/0x2d70 fs/gfs2/bmap.c:1951
do_shrink fs/gfs2/bmap.c:2031 [inline]
gfs2_setattr_size+0xc0b/0xfc0 fs/gfs2/bmap.c:2147
gfs2_setattr+0x244/0x3f0 fs/gfs2/inode.c:2025
notify_change+0xb0d/0xe10 fs/attr.c:499
do_truncate+0x19b/0x220 fs/open.c:66
handle_truncate fs/namei.c:3291 [inline]
do_open fs/namei.c:3636 [inline]
path_openat+0x298c/0x3190 fs/namei.c:3789
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_creat fs/open.c:1512 [inline]
__se_sys_creat fs/open.c:1506 [inline]
__x64_sys_creat+0x90/0xb0 fs/open.c:1506
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 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.5.45/6311:
#0: ffff88801dbcc418 (sb_writers#22){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:403
#1: ffff888058a73068 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#1: ffff888058a73068 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: do_truncate+0x187/0x220 fs/open.c:64
#2: ffff88801dbcc608 (sb_internal#6){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118
#3: ffff88807f841060 (&sdp->sd_log_flush_lock){++++}-{3:3}, at: __gfs2_trans_begin+0x511/0x880 fs/gfs2/trans.c:87
#4: ffff888058a734f0 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1526 [inline]
#4: ffff888058a734f0 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1c7d/0x2d70 fs/gfs2/bmap.c:1850
stack backtrace:
CPU: 1 PID: 6311 Comm: syz.5.45 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
check_noncircular+0x2bd/0x3c0 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+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747
do_qc+0xaf/0x670 fs/gfs2/quota.c:689
gfs2_quota_change+0x2b9/0x800 fs/gfs2/quota.c:1289
punch_hole+0x280c/0x2d70 fs/gfs2/bmap.c:1951
do_shrink fs/gfs2/bmap.c:2031 [inline]
gfs2_setattr_size+0xc0b/0xfc0 fs/gfs2/bmap.c:2147
gfs2_setattr+0x244/0x3f0 fs/gfs2/inode.c:2025
notify_change+0xb0d/0xe10 fs/attr.c:499
do_truncate+0x19b/0x220 fs/open.c:66
handle_truncate fs/namei.c:3291 [inline]
do_open fs/namei.c:3636 [inline]
path_openat+0x298c/0x3190 fs/namei.c:3789
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_creat fs/open.c:1512 [inline]
__se_sys_creat fs/open.c:1506 [inline]
__x64_sys_creat+0x90/0xb0 fs/open.c:1506
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0fd418ebe9
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:00007f0fd50ae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f0fd43b5fa0 RCX: 00007f0fd418ebe9
RDX: 0000000000000000 RSI: 000000000000000d RDI: 0000200000000240
RBP: 00007f0fd4211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0fd43b6038 R14: 00007f0fd43b5fa0 R15: 00007fff61979ae8
bio_check_eod: 31 callbacks suppressed
syz.5.45: attempt to access beyond end of device
loop5: rw=1, sector=2972, nr_sectors = 16 limit=64
gfs2: fsid=syz:syz.0: Error 10 writing to journal, jid=0
gfs2: fsid=syz:syz.0: about to withdraw this file system
gfs2: fsid=syz:syz.0: Journal recovery skipped for jid 0 until next mount.
gfs2: fsid=syz:syz.0: Glock dequeues delayed: 0
gfs2: fsid=syz:syz.0: File system withdrawn
CPU: 0 PID: 6311 Comm: syz.5.45 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
gfs2_withdraw+0xf16/0x14b0 fs/gfs2/util.c:354
gfs2_log_flush+0x1d3e/0x24b0 fs/gfs2/log.c:1157
gfs2_kill_sb+0x5d/0x320 fs/gfs2/ops_fstype.c:1789
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250
task_work_run+0x1ce/0x250 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x90b/0x23c0 kernel/exit.c:883
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
get_signal+0x12fc/0x1400 kernel/signal.c:2902
arch_do_signal_or_restart+0x96/0x780 arch/x86/kernel/signal.c:310
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0fd418ebe9
Code: Unable to access opcode bytes at 0x7f0fd418ebbf.
RSP: 002b:00007f0fd50ae0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f0fd43b5fa8 RCX: 00007f0fd418ebe9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0fd43b5fa8
RBP: 00007f0fd43b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0fd43b6038 R14: 00007fff61979a00 R15: 00007fff61979ae8