======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc2-syzkaller-00307-g36c254515dc6 #0 Not tainted
------------------------------------------------------
syz.0.0/5106 is trying to acquire lock:
ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: might_alloc include/linux/sched/mm.h:318 [inline]
ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: slab_pre_alloc_hook mm/slub.c:4036 [inline]
ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: slab_alloc_node mm/slub.c:4114 [inline]
ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __do_kmalloc_node mm/slub.c:4263 [inline]
ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __kmalloc_noprof+0xa9/0x400 mm/slub.c:4276
but task is already holding lock:
ffff88803f391858 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock_attr_map_shared+0x8c/0xc0 fs/xfs/xfs_inode.c:84
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&xfs_nondir_ilock_class#3){++++}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
down_write_nested+0xa2/0x220 kernel/locking/rwsem.c:1693
xfs_reclaim_inode fs/xfs/xfs_icache.c:981 [inline]
xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1675 [inline]
xfs_icwalk_ag+0x120e/0x1ad0 fs/xfs/xfs_icache.c:1757
xfs_icwalk fs/xfs/xfs_icache.c:1805 [inline]
xfs_reclaim_inodes_nr+0x2ae/0x390 fs/xfs/xfs_icache.c:1047
super_cache_scan+0x40f/0x4b0 fs/super.c:227
do_shrink_slab+0x701/0x1160 mm/shrinker.c:435
shrink_slab+0x1093/0x14d0 mm/shrinker.c:662
shrink_one+0x43b/0x850 mm/vmscan.c:4818
shrink_many mm/vmscan.c:4879 [inline]
lru_gen_shrink_node mm/vmscan.c:4957 [inline]
shrink_node+0x3799/0x3de0 mm/vmscan.c:5937
kswapd_shrink_node mm/vmscan.c:6765 [inline]
balance_pgdat mm/vmscan.c:6957 [inline]
kswapd+0x1ca3/0x3700 mm/vmscan.c:7226
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #0 (fs_reclaim){+.+.}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__fs_reclaim_acquire mm/page_alloc.c:3834 [inline]
fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3848
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4036 [inline]
slab_alloc_node mm/slub.c:4114 [inline]
__do_kmalloc_node mm/slub.c:4263 [inline]
__kmalloc_noprof+0xa9/0x400 mm/slub.c:4276
kmalloc_noprof include/linux/slab.h:882 [inline]
xfs_attr_shortform_list+0x753/0x1900 fs/xfs/xfs_attr_list.c:117
xfs_attr_list+0x1d0/0x270 fs/xfs/xfs_attr_list.c:595
xfs_vn_listxattr+0x1d2/0x2c0 fs/xfs/xfs_xattr.c:341
ovl_copy_xattr+0x1a1/0xc10 fs/overlayfs/copy_up.c:98
ovl_copy_up_metadata+0x267/0xef0 fs/overlayfs/copy_up.c:669
ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:894 [inline]
ovl_do_copy_up fs/overlayfs/copy_up.c:1000 [inline]
ovl_copy_up_one fs/overlayfs/copy_up.c:1203 [inline]
ovl_copy_up_flags+0x21cb/0x46f0 fs/overlayfs/copy_up.c:1258
ovl_open+0x13c/0x2a0 fs/overlayfs/file.c:156
do_dentry_open+0x978/0x1460 fs/open.c:958
vfs_open+0x3e/0x330 fs/open.c:1088
do_open fs/namei.c:3774 [inline]
path_openat+0x2c84/0x3590 fs/namei.c:3933
do_filp_open+0x235/0x490 fs/namei.c:3960
do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
do_sys_open fs/open.c:1430 [inline]
__do_sys_open fs/open.c:1438 [inline]
__se_sys_open fs/open.c:1434 [inline]
__x64_sys_open+0x225/0x270 fs/open.c:1434
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
rlock(&xfs_nondir_ilock_class#3);
lock(fs_reclaim);
lock(&xfs_nondir_ilock_class#3);
lock(fs_reclaim);
*** DEADLOCK ***
3 locks held by syz.0.0/5106:
#0: ffff888012d527d0 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:657 [inline]
#0: ffff888012d527d0 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_copy_up_start+0x53/0x310 fs/overlayfs/util.c:719
#1: ffff888040c3a420 (sb_writers#5){.+.+}-{0:0}, at: ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:892 [inline]
#1: ffff888040c3a420 (sb_writers#5){.+.+}-{0:0}, at: ovl_do_copy_up fs/overlayfs/copy_up.c:1000 [inline]
#1: ffff888040c3a420 (sb_writers#5){.+.+}-{0:0}, at: ovl_copy_up_one fs/overlayfs/copy_up.c:1203 [inline]
#1: ffff888040c3a420 (sb_writers#5){.+.+}-{0:0}, at: ovl_copy_up_flags+0x21be/0x46f0 fs/overlayfs/copy_up.c:1258
#2: ffff88803f391858 (&xfs_nondir_ilock_class#3){++++}-{3:3}, at: xfs_ilock_attr_map_shared+0x8c/0xc0 fs/xfs/xfs_inode.c:84
stack backtrace:
CPU: 0 UID: 0 PID: 5106 Comm: syz.0.0 Not tainted 6.12.0-rc2-syzkaller-00307-g36c254515dc6 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904
__lock_acquire+0x1384/0x2050 kernel/locking/lockdep.c:5202
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5825
__fs_reclaim_acquire mm/page_alloc.c:3834 [inline]
fs_reclaim_acquire+0x88/0x130 mm/page_alloc.c:3848
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4036 [inline]
slab_alloc_node mm/slub.c:4114 [inline]
__do_kmalloc_node mm/slub.c:4263 [inline]
__kmalloc_noprof+0xa9/0x400 mm/slub.c:4276
kmalloc_noprof include/linux/slab.h:882 [inline]
xfs_attr_shortform_list+0x753/0x1900 fs/xfs/xfs_attr_list.c:117
xfs_attr_list+0x1d0/0x270 fs/xfs/xfs_attr_list.c:595
xfs_vn_listxattr+0x1d2/0x2c0 fs/xfs/xfs_xattr.c:341
ovl_copy_xattr+0x1a1/0xc10 fs/overlayfs/copy_up.c:98
ovl_copy_up_metadata+0x267/0xef0 fs/overlayfs/copy_up.c:669
ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:894 [inline]
ovl_do_copy_up fs/overlayfs/copy_up.c:1000 [inline]
ovl_copy_up_one fs/overlayfs/copy_up.c:1203 [inline]
ovl_copy_up_flags+0x21cb/0x46f0 fs/overlayfs/copy_up.c:1258
ovl_open+0x13c/0x2a0 fs/overlayfs/file.c:156
do_dentry_open+0x978/0x1460 fs/open.c:958
vfs_open+0x3e/0x330 fs/open.c:1088
do_open fs/namei.c:3774 [inline]
path_openat+0x2c84/0x3590 fs/namei.c:3933
do_filp_open+0x235/0x490 fs/namei.c:3960
do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
do_sys_open fs/open.c:1430 [inline]
__do_sys_open fs/open.c:1438 [inline]
__se_sys_open fs/open.c:1434 [inline]
__x64_sys_open+0x225/0x270 fs/open.c:1434
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f195957dff9
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:00007f195a28f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f1959735f80 RCX: 00007f195957dff9
RDX: 0000000000000082 RSI: 0000000000000002 RDI: 0000000020000480
RBP: 00007f19595f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1959735f80 R15: 00007fff31a81948
</TASK>