======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz-executor/7767 is trying to acquire lock:
ffff88807465cae8 (&sdp->sd_quota_mutex){+.+.}-{3:3}, at: do_qc+0xa1/0x5f0 fs/gfs2/quota.c:690
but task is already holding lock:
ffff88805c91dd40 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1556 [inline]
ffff88805c91dd40 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1c8e/0x2e00 fs/gfs2/bmap.c:1880
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+0x168/0x1390 fs/gfs2/bmap.c:862
gfs2_iomap_get+0xef/0x170 fs/gfs2/bmap.c:1440
bh_get+0x251/0x760 fs/gfs2/quota.c:402
qdsb_get+0x210/0x330 fs/gfs2/quota.c:536
gfs2_quota_hold+0x191/0x5c0 fs/gfs2/quota.c:616
gfs2_quota_lock+0xba/0x7b0 fs/gfs2/quota.c:1071
gfs2_quota_lock_check fs/gfs2/quota.h:50 [inline]
gfs2_page_mkwrite+0xc96/0x13f0 fs/gfs2/file.c:484
do_page_mkwrite+0x153/0x3f0 mm/memory.c:2951
wp_page_shared mm/memory.c:3311 [inline]
do_wp_page+0xd4d/0x34d0 mm/memory.c:3396
handle_pte_fault mm/memory.c:5063 [inline]
__handle_mm_fault mm/memory.c:5190 [inline]
handle_mm_fault+0x1300/0x4a40 mm/memory.c:5355
fixup_user_fault+0x386/0x750 mm/gup.c:1330
fault_in_safe_writeable+0x11f/0x220 mm/gup.c:1868
fault_in_iov_iter_writeable+0xc3/0x300 lib/iov_iter.c:259
gfs2_file_read_iter+0x969/0xc60 fs/gfs2/file.c:997
call_read_iter include/linux/fs.h:2013 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x486/0x990 fs/read_write.c:470
ksys_read+0x151/0x260 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
-> #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+0x3a07/0x7eb0 kernel/locking/lockdep.c:5171
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x135/0xce0 kernel/locking/mutex.c:747
do_qc+0xa1/0x5f0 fs/gfs2/quota.c:690
gfs2_quota_change+0x28f/0x7a0 fs/gfs2/quota.c:1290
punch_hole+0x282f/0x2e00 fs/gfs2/bmap.c:1981
evict_unlinked_inode fs/gfs2/super.c:1423 [inline]
gfs2_evict_inode+0xdf1/0x13c0 fs/gfs2/super.c:1526
evict+0x4b3/0x9d0 fs/inode.c:702
do_unlinkat+0x38c/0x590 fs/namei.c:4465
__do_sys_unlink fs/namei.c:4506 [inline]
__se_sys_unlink fs/namei.c:4504 [inline]
__x64_sys_unlink+0x49/0x50 fs/namei.c:4504
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
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 ***
4 locks held by syz-executor/7767:
#0: ffff88807c8fc418 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
#1: ffff88807c8fc608 (sb_internal#6){.+.+}-{0:0}, at: gfs2_trans_begin+0x6f/0xe0 fs/gfs2/trans.c:118
#2: ffff88807465d060 (&sdp->sd_log_flush_lock){++++}-{3:3}, at: __gfs2_trans_begin+0x537/0x8b0 fs/gfs2/trans.c:87
#3: ffff88805c91dd40 (&ip->i_rw_mutex){++++}-{3:3}, at: sweep_bh_for_rgrps fs/gfs2/bmap.c:1556 [inline]
#3: ffff88805c91dd40 (&ip->i_rw_mutex){++++}-{3:3}, at: punch_hole+0x1c8e/0x2e00 fs/gfs2/bmap.c:1880
stack backtrace:
CPU: 0 PID: 7767 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
check_noncircular+0x2fc/0x400 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+0x3a07/0x7eb0 kernel/locking/lockdep.c:5171
lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x135/0xce0 kernel/locking/mutex.c:747
do_qc+0xa1/0x5f0 fs/gfs2/quota.c:690
gfs2_quota_change+0x28f/0x7a0 fs/gfs2/quota.c:1290
punch_hole+0x282f/0x2e00 fs/gfs2/bmap.c:1981
evict_unlinked_inode fs/gfs2/super.c:1423 [inline]
gfs2_evict_inode+0xdf1/0x13c0 fs/gfs2/super.c:1526
evict+0x4b3/0x9d0 fs/inode.c:702
do_unlinkat+0x38c/0x590 fs/namei.c:4465
__do_sys_unlink fs/namei.c:4506 [inline]
__se_sys_unlink fs/namei.c:4504 [inline]
__x64_sys_unlink+0x49/0x50 fs/namei.c:4504
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9f5b19ec07
Code: 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe619df198 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9f5b19ec07
RDX: 00007ffe619df1c0 RSI: 00007ffe619df250 RDI: 00007ffe619df250
RBP: 00007ffe619df250 R08: 00007ffe619e0250 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffe619e0340
R13: 00007f9f5b236fb3 R14: 000000000004b7e0 R15: 00007ffe619e1410
syz-executor: attempt to access beyond end of device
loop6: rw=1, sector=2972, nr_sectors = 10 limit=0
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
kobject: 'syz:syz' (ffff88807465c010): kobject_uevent_env
kobject: 'syz:syz' (ffff88807465c010): fill_kobj_path: path = '/fs/gfs2/syz:syz'
gfs2: fsid=syz:syz.0: File system withdrawn
CPU: 0 PID: 7767 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
gfs2_withdraw+0xe16/0x1400 fs/gfs2/util.c:345
__gfs2_log_flush+0x1d4d/0x24d0 fs/gfs2/log.c:1157
gfs2_log_flush+0x34/0x50 fs/gfs2/log.c:1180
gfs2_kill_sb+0x5c/0x2e0 fs/gfs2/ops_fstype.c:1789
deactivate_locked_super+0x9c/0x210 fs/super.c:479
cleanup_mnt+0x3d7/0x460 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
__syscall_exit_to_user_mode_work kernel/entry/common.c:294 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:305
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9f5b1a0d57
Code: a2 c7 05 9c a9 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffe619df198 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000064 RCX: 00007f9f5b1a0d57
RDX: 0000000000000200 RSI: 0000000000000009 RDI: 00007ffe619e0340
RBP: 00007f9f5b236fb3 R08: 0000000000010590 R09: 00000000ffffffff
R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffe619e0340
R13: 00007f9f5b236fb3 R14: 000055555a32b4e8 R15: 00007ffe619e1410