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BUG: KASAN: use-after-free in __crypto_xor+0x376/0x410 crypto/algapi.c:1001
Read of size 8 at addr ffff888038b7a5a8 by task kworker/u4:11/10841

CPU: 0 PID: 10841 Comm: kworker/u4:11 Not tainted 5.14.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt_parallel padata_parallel_worker
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
 print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
 __crypto_xor+0x376/0x410 crypto/algapi.c:1001
 crypto_xor include/crypto/algapi.h:160 [inline]
 crypto_ctr_crypt_segment crypto/ctr.c:60 [inline]
 crypto_ctr_crypt+0x256/0x550 crypto/ctr.c:114
 crypto_skcipher_encrypt+0xaa/0xf0 crypto/skcipher.c:630
 crypto_gcm_encrypt+0x38f/0x4b0 crypto/gcm.c:461
 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94
 pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82
 padata_parallel_worker+0x60/0xb0 kernel/padata.c:157
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the page:
page:ffffea0000e2de80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x100 pfn:0x38b7a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000100 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x1100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 19464, ts 426630730031, free_ts 426632542242
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391
 alloc_pages_vma+0xd9/0x710 mm/mempolicy.c:2208
 do_anonymous_page mm/memory.c:3767 [inline]
 handle_pte_fault mm/memory.c:4556 [inline]
 __handle_mm_fault+0x1f67/0x5320 mm/memory.c:4693
 handle_mm_fault+0x1c8/0x790 mm/memory.c:4791
 do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1346 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397
 free_unref_page_prepare mm/page_alloc.c:3332 [inline]
 free_unref_page_list+0x1a1/0x1050 mm/page_alloc.c:3448
 release_pages+0x824/0x20b0 mm/swap.c:972
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu mm/mmu_gather.c:249 [inline]
 tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:340
 exit_mmap+0x1ea/0x620 mm/mmap.c:3203
 __mmput+0x122/0x470 kernel/fork.c:1101
 mmput+0x58/0x60 kernel/fork.c:1122
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a60 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Memory state around the buggy address:
 ffff888038b7a480: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888038b7a500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888038b7a580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888038b7a600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888038b7a680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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