======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc5-syzkaller-00015-g3e9bff3bbe13 #0 Not tainted
------------------------------------------------------
kswapd0/91 is trying to acquire lock:
ffff888069318610 (sb_internal){++++}-{0:0}, at: __sb_start_write include/linux/fs.h:1675 [inline]
ffff888069318610 (sb_internal){++++}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1858 [inline]
ffff888069318610 (sb_internal){++++}-{0:0}, at: ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:212
but task is already holding lock:
ffffffff8e82e420 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6841 [inline]
ffffffff8e82e420 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb06/0x2e80 mm/vmscan.c:7223
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (fs_reclaim){+.+.}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
__fs_reclaim_acquire mm/page_alloc.c:3818 [inline]
fs_reclaim_acquire+0x88/0x140 mm/page_alloc.c:3832
might_alloc include/linux/sched/mm.h:334 [inline]
slab_pre_alloc_hook mm/slub.c:3939 [inline]
slab_alloc_node mm/slub.c:4017 [inline]
__kmalloc_cache_noprof+0x3d/0x2c0 mm/slub.c:4184
kmalloc_noprof include/linux/slab.h:681 [inline]
kzalloc_noprof include/linux/slab.h:807 [inline]
assoc_array_insert+0xfe/0x33e0 lib/assoc_array.c:980
__key_link_begin+0xe5/0x1f0 security/keys/keyring.c:1314
__key_create_or_update+0x570/0xc70 security/keys/key.c:874
key_create_or_update+0x42/0x60 security/keys/key.c:1018
x509_load_certificate_list+0x149/0x270 crypto/asymmetric_keys/x509_loader.c:31
do_one_initcall+0x248/0x880 init/main.c:1267
do_initcall_level+0x157/0x210 init/main.c:1329
do_initcalls+0x3f/0x80 init/main.c:1345
kernel_init_freeable+0x435/0x5d0 init/main.c:1578
kernel_init+0x1d/0x2b0 init/main.c:1467
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #1 (&type->lock_class){+.+.}-{3:3}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
down_write+0x99/0x220 kernel/locking/rwsem.c:1579
keyring_clear+0xb2/0x350 security/keys/keyring.c:1655
fscrypt_put_master_key+0xc8/0x190 fs/crypto/keyring.c:79
put_crypt_info+0x275/0x320 fs/crypto/keysetup.c:548
fscrypt_put_encryption_info+0x40/0x60 fs/crypto/keysetup.c:753
ext4_clear_inode+0x15b/0x1c0 fs/ext4/super.c:1524
ext4_free_inode+0x392/0xfc0 fs/ext4/ialloc.c:278
ext4_evict_inode+0xbef/0xf50 fs/ext4/inode.c:303
evict+0x532/0x950 fs/inode.c:704
d_delete_notify include/linux/fsnotify.h:332 [inline]
vfs_rmdir+0x3d7/0x510 fs/namei.c:4306
do_rmdir+0x3b5/0x580 fs/namei.c:4352
__do_sys_unlinkat fs/namei.c:4528 [inline]
__se_sys_unlinkat fs/namei.c:4522 [inline]
__x64_sys_unlinkat+0xde/0xf0 fs/namei.c:4522
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
-> #0 (sb_internal){++++}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51
__sb_start_write include/linux/fs.h:1675 [inline]
sb_start_intwrite include/linux/fs.h:1858 [inline]
ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:212
evict+0x532/0x950 fs/inode.c:704
__dentry_kill+0x20d/0x630 fs/dcache.c:610
shrink_kill+0xa9/0x2c0 fs/dcache.c:1055
shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1082
prune_dcache_sb+0x10f/0x180 fs/dcache.c:1163
super_cache_scan+0x34f/0x4b0 fs/super.c:221
do_shrink_slab+0x701/0x1160 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0x878/0x14d0 mm/shrinker.c:626
shrink_node_memcgs mm/vmscan.c:5910 [inline]
shrink_node+0x130f/0x2df0 mm/vmscan.c:5948
kswapd_shrink_node mm/vmscan.c:6762 [inline]
balance_pgdat mm/vmscan.c:6954 [inline]
kswapd+0x191b/0x2e80 mm/vmscan.c:7223
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
other info that might help us debug this:
Chain exists of:
sb_internal --> &type->lock_class --> fs_reclaim
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(&type->lock_class);
lock(fs_reclaim);
rlock(sb_internal);
*** DEADLOCK ***
2 locks held by kswapd0/91:
#0: ffffffff8e82e420 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6841 [inline]
#0: ffffffff8e82e420 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0xb06/0x2e80 mm/vmscan.c:7223
#1: ffff8880693180e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_trylock_shared fs/super.c:562 [inline]
#1: ffff8880693180e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_cache_scan+0x94/0x4b0 fs/super.c:196
stack backtrace:
CPU: 0 UID: 0 PID: 91 Comm: kswapd0 Not tainted 6.11.0-rc5-syzkaller-00015-g3e9bff3bbe13 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:93 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2186
check_prev_add kernel/locking/lockdep.c:3133 [inline]
check_prevs_add kernel/locking/lockdep.c:3252 [inline]
validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3868
__lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5142
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5759
percpu_down_read+0x44/0x1b0 include/linux/percpu-rwsem.h:51
__sb_start_write include/linux/fs.h:1675 [inline]
sb_start_intwrite include/linux/fs.h:1858 [inline]
ext4_evict_inode+0x2f4/0xf50 fs/ext4/inode.c:212
evict+0x532/0x950 fs/inode.c:704
__dentry_kill+0x20d/0x630 fs/dcache.c:610
shrink_kill+0xa9/0x2c0 fs/dcache.c:1055
shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1082
prune_dcache_sb+0x10f/0x180 fs/dcache.c:1163
super_cache_scan+0x34f/0x4b0 fs/super.c:221
do_shrink_slab+0x701/0x1160 mm/shrinker.c:435
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0x878/0x14d0 mm/shrinker.c:626
shrink_node_memcgs mm/vmscan.c:5910 [inline]
shrink_node+0x130f/0x2df0 mm/vmscan.c:5948
kswapd_shrink_node mm/vmscan.c:6762 [inline]
balance_pgdat mm/vmscan.c:6954 [inline]
kswapd+0x191b/0x2e80 mm/vmscan.c:7223
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
</TASK>