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BUG: KCSAN: data-race in __xa_clear_mark / xas_find_marked

read-write to 0xffff888106becb50 of 8 bytes by interrupt on cpu 1:
 instrument_read_write include/linux/instrumented.h:55 [inline]
 __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
 ___test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:114 [inline]
 node_clear_mark lib/xarray.c:102 [inline]
 xas_clear_mark lib/xarray.c:922 [inline]
 __xa_clear_mark+0xf5/0x1e0 lib/xarray.c:2097
 __folio_end_writeback+0x177/0x470 mm/page-writeback.c:3024
 folio_end_writeback+0x71/0x3d0 mm/filemap.c:1660
 ext4_finish_bio+0x459/0x8c0 fs/ext4/page-io.c:144
 ext4_end_bio+0x22a/0x330 fs/ext4/page-io.c:-1
 bio_endio+0x374/0x410 block/bio.c:1645
 blk_update_request+0x336/0x730 block/blk-mq.c:987
 scsi_end_request+0x53/0x4c0 drivers/scsi/scsi_lib.c:637
 scsi_io_completion+0x7f/0x200 drivers/scsi/scsi_lib.c:1078
 scsi_finish_command+0x1c7/0x1e0 drivers/scsi/scsi.c:198
 scsi_complete+0xc3/0x1e0 drivers/scsi/scsi_lib.c:1547
 blk_complete_reqs block/blk-mq.c:1224 [inline]
 blk_done_softirq+0x77/0xb0 block/blk-mq.c:1229
 handle_softirqs+0xb7/0x290 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:680
 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:285
 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705
 crypto_shash_finup+0x2d/0x420 crypto/shash.c:113
 jent_hash_time+0x13a/0x2b0 crypto/jitterentropy-kcapi.c:138
 jent_condition_data+0x106/0x130 crypto/jitterentropy.c:438
 jent_measure_jitter+0x10a/0x1a0 crypto/jitterentropy.c:541
 jent_gen_entropy+0x72/0xe0 crypto/jitterentropy.c:569
 jent_read_entropy+0x96/0x270 crypto/jitterentropy.c:615
 jent_kcapi_random+0x3b/0xf0 crypto/jitterentropy-kcapi.c:283
 crypto_rng_generate include/crypto/rng.h:144 [inline]
 crypto_rng_get_bytes include/crypto/rng.h:161 [inline]
 drbg_seed+0x1d6/0x530 crypto/drbg.c:1185
 drbg_instantiate crypto/drbg.c:1597 [inline]
 drbg_kcapi_seed+0x656/0x8b0 crypto/drbg.c:1970
 crypto_rng_reset crypto/rng.c:47 [inline]
 crypto_get_default_rng+0x144/0x1b0 crypto/rng.c:122
 aead_init_geniv+0x3e/0x140 crypto/geniv.c:117
 crypto_aead_init_tfm+0x9d/0xc0 crypto/aead.c:130
 crypto_create_tfm_node+0x108/0x250 crypto/api.c:541
 crypto_alloc_tfm_node+0xdc/0x2b0 crypto/api.c:642
 crypto_alloc_tfm crypto/internal.h:149 [inline]
 crypto_alloc_aead+0x2d/0x40 crypto/aead.c:203
 esp_init_authenc net/ipv6/esp6.c:1081 [inline]
 esp6_init_state+0x3f3/0xa00 net/ipv6/esp6.c:1151
 __xfrm_init_state+0x740/0xbb0 net/xfrm/xfrm_state.c:3186
 xfrm_init_state+0x1a/0x80 net/xfrm/xfrm_state.c:3229
 pfkey_msg2xfrm_state net/key/af_key.c:1286 [inline]
 pfkey_add+0xebc/0x12e0 net/key/af_key.c:1504
 pfkey_process net/key/af_key.c:2848 [inline]
 pfkey_sendmsg+0x718/0x900 net/key/af_key.c:3699
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x145/0x180 net/socket.c:727
 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2566
 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2620
 __sys_sendmsg net/socket.c:2652 [inline]
 __do_sys_sendmsg net/socket.c:2657 [inline]
 __se_sys_sendmsg net/socket.c:2655 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2655
 x64_sys_call+0x2999/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888106becb50 of 8 bytes by task 7425 on cpu 0:
 xas_find_chunk include/linux/xarray.h:1752 [inline]
 xas_find_marked+0x218/0x620 lib/xarray.c:1510
 find_get_entry+0x5d/0x380 mm/filemap.c:2038
 filemap_get_folios_tag+0x13b/0x210 mm/filemap.c:2306
 __filemap_fdatawait_range mm/filemap.c:530 [inline]
 filemap_fdatawait_keep_errors+0x6c/0x180 mm/filemap.c:633
 wait_sb_inodes fs/fs-writeback.c:2714 [inline]
 sync_inodes_sb+0x39c/0x440 fs/fs-writeback.c:2836
 sync_inodes_one_sb+0x3d/0x50 fs/sync.c:77
 __iterate_supers+0x10d/0x1f0 fs/super.c:924
 iterate_supers+0x1f/0x30 fs/super.c:939
 ksys_sync+0x5c/0xe0 fs/sync.c:102
 __ia32_sys_sync+0xe/0x20 fs/sync.c:113
 x64_sys_call+0x2e53/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:163
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xfffffff800000000 -> 0xfffffe0000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 7425 Comm: syz.5.1732 Not tainted 6.16.0-rc4-syzkaller-00308-ga79a588fc176 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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