======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc7-syzkaller-g5bc55a333a2f #0 Not tainted
------------------------------------------------------
kswapd0/113 is trying to acquire lock:
ffffffff8e05ef50 (cpu_hotplug_lock){++++}-{0:0}, at: acomp_ctx_get_cpu mm/zswap.c:886 [inline]
ffffffff8e05ef50 (cpu_hotplug_lock){++++}-{0:0}, at: zswap_compress mm/zswap.c:908 [inline]
ffffffff8e05ef50 (cpu_hotplug_lock){++++}-{0:0}, at: zswap_store_page mm/zswap.c:1439 [inline]
ffffffff8e05ef50 (cpu_hotplug_lock){++++}-{0:0}, at: zswap_store+0x905/0x26a0 mm/zswap.c:1546
but task is already holding lock:
ffffffff8e350ae0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x16e/0x18f0 mm/vmscan.c:6871
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (fs_reclaim){+.+.}-{0:0}:
__fs_reclaim_acquire mm/page_alloc.c:3853 [inline]
fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:3867
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4070 [inline]
slab_alloc_node mm/slub.c:4148 [inline]
__kmalloc_cache_node_noprof+0x54/0x420 mm/slub.c:4337
kmalloc_node_noprof include/linux/slab.h:924 [inline]
alloc_worker kernel/workqueue.c:2645 [inline]
create_worker+0x10a/0x800 kernel/workqueue.c:2788
workqueue_prepare_cpu+0xb5/0x160 kernel/workqueue.c:6635
cpuhp_invoke_callback+0x3d0/0xa10 kernel/cpu.c:194
__cpuhp_invoke_callback_range+0x101/0x200 kernel/cpu.c:965
cpuhp_invoke_callback_range kernel/cpu.c:989 [inline]
cpuhp_up_callbacks kernel/cpu.c:1020 [inline]
_cpu_up+0x3fd/0x910 kernel/cpu.c:1690
cpu_up+0x1dc/0x240 kernel/cpu.c:1722
cpuhp_bringup_mask+0xdc/0x210 kernel/cpu.c:1788
cpuhp_bringup_cpus_parallel kernel/cpu.c:1866 [inline]
bringup_nonboot_cpus+0xf5/0x1c0 kernel/cpu.c:1892
smp_init+0x34/0x160 kernel/smp.c:1009
kernel_init_freeable+0x3ad/0x900 init/main.c:1569
kernel_init+0x1c/0x2b0 init/main.c:1466
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
-> #0 (cpu_hotplug_lock){++++}-{0:0}:
check_prev_add kernel/locking/lockdep.c:3161 [inline]
check_prevs_add kernel/locking/lockdep.c:3280 [inline]
validate_chain kernel/locking/lockdep.c:3904 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
cpus_read_lock+0x42/0x160 kernel/cpu.c:490
acomp_ctx_get_cpu mm/zswap.c:886 [inline]
zswap_compress mm/zswap.c:908 [inline]
zswap_store_page mm/zswap.c:1439 [inline]
zswap_store+0x905/0x26a0 mm/zswap.c:1546
swap_writepage+0x3b6/0x1120 mm/page_io.c:279
pageout+0x3b2/0xaa0 mm/vmscan.c:696
shrink_folio_list+0x3025/0x42d0 mm/vmscan.c:1374
evict_folios+0x6e3/0x19c0 mm/vmscan.c:4600
try_to_shrink_lruvec+0x61e/0xa80 mm/vmscan.c:4796
shrink_one+0x3e3/0x7b0 mm/vmscan.c:4841
shrink_many mm/vmscan.c:4904 [inline]
lru_gen_shrink_node mm/vmscan.c:4982 [inline]
shrink_node+0x2763/0x3e60 mm/vmscan.c:5963
kswapd_shrink_node mm/vmscan.c:6792 [inline]
balance_pgdat+0xc1f/0x18f0 mm/vmscan.c:6984
kswapd+0x605/0xc00 mm/vmscan.c:7253
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 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:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(fs_reclaim);
lock(cpu_hotplug_lock);
lock(fs_reclaim);
rlock(cpu_hotplug_lock);
*** DEADLOCK ***
1 lock held by kswapd0/113:
#0: ffffffff8e350ae0 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x16e/0x18f0 mm/vmscan.c:6871
stack backtrace:
CPU: 1 UID: 0 PID: 113 Comm: kswapd0 Not tainted 6.13.0-rc7-syzkaller-g5bc55a333a2f #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+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x419/0x5d0 kernel/locking/lockdep.c:2074
check_noncircular+0x31a/0x400 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 kernel/locking/lockdep.c:3904 [inline]
__lock_acquire+0x249e/0x3c40 kernel/locking/lockdep.c:5226
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
cpus_read_lock+0x42/0x160 kernel/cpu.c:490
acomp_ctx_get_cpu mm/zswap.c:886 [inline]
zswap_compress mm/zswap.c:908 [inline]
zswap_store_page mm/zswap.c:1439 [inline]
zswap_store+0x905/0x26a0 mm/zswap.c:1546
swap_writepage+0x3b6/0x1120 mm/page_io.c:279
pageout+0x3b2/0xaa0 mm/vmscan.c:696
shrink_folio_list+0x3025/0x42d0 mm/vmscan.c:1374
evict_folios+0x6e3/0x19c0 mm/vmscan.c:4600
try_to_shrink_lruvec+0x61e/0xa80 mm/vmscan.c:4796
shrink_one+0x3e3/0x7b0 mm/vmscan.c:4841
shrink_many mm/vmscan.c:4904 [inline]
lru_gen_shrink_node mm/vmscan.c:4982 [inline]
shrink_node+0x2763/0x3e60 mm/vmscan.c:5963
kswapd_shrink_node mm/vmscan.c:6792 [inline]
balance_pgdat+0xc1f/0x18f0 mm/vmscan.c:6984
kswapd+0x605/0xc00 mm/vmscan.c:7253
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>