==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_write include/linux/instrumented.h:82 [inline]
BUG: KASAN: slab-use-after-free in set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
BUG: KASAN: slab-use-after-free in xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:791 [inline]
BUG: KASAN: slab-use-after-free in xlog_cil_committed+0x454/0x1020 fs/xfs/xfs_log_cil.c:897
Write of size 8 at addr ffff888050da7d60 by task kworker/u8:7/1008

CPU: 0 UID: 0 PID: 1008 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT_{RT,(full)} [  250.246681][ T1008] CPU: 0 UID: 0 PID: 1008 Comm: kworker/u8:7 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: xfs-cil/loop8 xlog_cil_push_work
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
 instrument_atomic_write include/linux/instrumented.h:82 [inline]
 set_bit include/asm-generic/bitops/instrumented-atomic.h:28 [inline]
 xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:791 [inline]
 xlog_cil_committed+0x454/0x1020 fs/xfs/xfs_log_cil.c:897
 xlog_cil_push_work+0x1f2a/0x2560 fs/xfs/xfs_log_cil.c:1518
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Allocated by task 7244:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 unpoison_slab_object mm/kasan/common.c:340 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x18d/0x6c0 mm/slub.c:5270
 xfs_buf_item_init+0x6a/0x6d0 fs/xfs/xfs_buf_item.c:878
 _xfs_trans_bjoin+0x46/0x110 fs/xfs/xfs_trans_buf.c:75
 xfs_trans_read_buf_map+0x28f/0x8a0 fs/xfs/xfs_trans_buf.c:325
 xfs_trans_read_buf fs/xfs/xfs_trans.h:210 [inline]
 xfs_btree_read_buf_block+0x290/0x470 fs/xfs/libxfs/xfs_btree.c:1402
 xfs_btree_lookup_get_block+0x28d/0x500 fs/xfs/libxfs/xfs_btree.c:1907
 xfs_btree_lookup+0x4e1/0x1410 fs/xfs/libxfs/xfs_btree.c:2018
 xfs_alloc_lookup fs/xfs/libxfs/xfs_alloc.c:166 [inline]
 xfs_alloc_lookup_eq fs/xfs/libxfs/xfs_alloc.c:184 [inline]
 xfs_alloc_fixup_trees+0x21b/0xd20 fs/xfs/libxfs/xfs_alloc.c:626
 xfs_alloc_cur_finish+0xd5/0x480 fs/xfs/libxfs/xfs_alloc.c:1117
 xfs_alloc_ag_vextent_near+0xd0d/0x11d0 fs/xfs/libxfs/xfs_alloc.c:1776
 xfs_alloc_vextent_iterate_ags+0x620/0x910 fs/xfs/libxfs/xfs_alloc.c:3764
 xfs_alloc_vextent_start_ag+0x378/0x830 fs/xfs/libxfs/xfs_alloc.c:3839
 xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3619 [inline]
 xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3663 [inline]
 xfs_bmapi_allocate+0x1891/0x2e10 fs/xfs/libxfs/xfs_bmap.c:3938
 xfs_bmapi_write+0x7df/0x1260 fs/xfs/libxfs/xfs_bmap.c:4267
 xfs_iomap_write_direct+0x3b2/0x6b0 fs/xfs/xfs_iomap.c:335
 xfs_direct_write_iomap_begin+0xfa3/0x13e0 fs/xfs/xfs_iomap.c:1009
 iomap_iter+0x5ef/0xeb0 fs/iomap/iter.c:110
 __iomap_dio_rw+0x12d2/0x1d90 fs/iomap/direct-io.c:752
 iomap_dio_rw+0x45/0xb0 fs/iomap/direct-io.c:847
 xfs_file_dio_write_aligned+0x182/0x1e0 fs/xfs/xfs_file.c:707
 xfs_file_dio_write fs/xfs/xfs_file.c:910 [inline]
 xfs_file_write_iter+0x7ea/0x920 fs/xfs/xfs_file.c:1122
 iter_file_splice_write+0x977/0x10b0 fs/splice.c:738
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0x104/0x160 fs/splice.c:1161
 splice_direct_to_actor+0x5b3/0xcd0 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x187/0x270 fs/splice.c:1230
 do_sendfile+0x4ec/0x7f0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7244:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6670 [inline]
 kmem_cache_free+0x18f/0x8d0 mm/slub.c:6781
 __xfs_buf_ioend+0x28c/0x6d0 fs/xfs/xfs_buf.c:1199
 xfs_buf_iowait+0x143/0x440 fs/xfs/xfs_buf.c:1381
 _xfs_buf_read fs/xfs/xfs_buf.c:643 [inline]
 xfs_buf_read_map+0x325/0xa30 fs/xfs/xfs_buf.c:709
 xfs_trans_read_buf_map+0x1d7/0x8a0 fs/xfs/xfs_trans_buf.c:304
 xfs_trans_read_buf fs/xfs/xfs_trans.h:210 [inline]
 xfs_btree_read_buf_block+0x290/0x470 fs/xfs/libxfs/xfs_btree.c:1402
 xfs_btree_lookup_get_block+0x28d/0x500 fs/xfs/libxfs/xfs_btree.c:1907
 xfs_btree_lookup+0x4e1/0x1410 fs/xfs/libxfs/xfs_btree.c:2018
 xfs_alloc_lookup fs/xfs/libxfs/xfs_alloc.c:166 [inline]
 xfs_alloc_lookup_eq fs/xfs/libxfs/xfs_alloc.c:184 [inline]
 xfs_alloc_fixup_trees+0x21b/0xd20 fs/xfs/libxfs/xfs_alloc.c:626
 xfs_alloc_cur_finish+0xd5/0x480 fs/xfs/libxfs/xfs_alloc.c:1117
 xfs_alloc_ag_vextent_near+0xd0d/0x11d0 fs/xfs/libxfs/xfs_alloc.c:1776
 xfs_alloc_vextent_iterate_ags+0x620/0x910 fs/xfs/libxfs/xfs_alloc.c:3764
 xfs_alloc_vextent_start_ag+0x378/0x830 fs/xfs/libxfs/xfs_alloc.c:3839
 xfs_bmap_btalloc_best_length fs/xfs/libxfs/xfs_bmap.c:3619 [inline]
 xfs_bmap_btalloc fs/xfs/libxfs/xfs_bmap.c:3663 [inline]
 xfs_bmapi_allocate+0x1891/0x2e10 fs/xfs/libxfs/xfs_bmap.c:3938
 xfs_bmapi_write+0x7df/0x1260 fs/xfs/libxfs/xfs_bmap.c:4267
 xfs_iomap_write_direct+0x3b2/0x6b0 fs/xfs/xfs_iomap.c:335
 xfs_direct_write_iomap_begin+0xfa3/0x13e0 fs/xfs/xfs_iomap.c:1009
 iomap_iter+0x5ef/0xeb0 fs/iomap/iter.c:110
 __iomap_dio_rw+0xc3d/0x1d90 fs/iomap/direct-io.c:752
 iomap_dio_rw+0x45/0xb0 fs/iomap/direct-io.c:847
 xfs_file_dio_write_aligned+0x182/0x1e0 fs/xfs/xfs_file.c:707
 xfs_file_dio_write fs/xfs/xfs_file.c:910 [inline]
 xfs_file_write_iter+0x7ea/0x920 fs/xfs/xfs_file.c:1122
 iter_file_splice_write+0x977/0x10b0 fs/splice.c:738
 do_splice_from fs/splice.c:938 [inline]
 direct_splice_actor+0x104/0x160 fs/splice.c:1161
 splice_direct_to_actor+0x5b3/0xcd0 fs/splice.c:1105
 do_splice_direct_actor fs/splice.c:1204 [inline]
 do_splice_direct+0x187/0x270 fs/splice.c:1230
 do_sendfile+0x4ec/0x7f0 fs/read_write.c:1370
 __do_sys_sendfile64 fs/read_write.c:1431 [inline]
 __se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888050da7d20
 which belongs to the cache xfs_buf_item of size 272
The buggy address is located 64 bytes inside of
 freed 272-byte region [ffff888050da7d20, ffff888050da7e30)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x50da7
anon flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88801c794500 ffffea00016c8980 0000000000000005
raw: 0000000000000000 00000000000c000c 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6612, tgid 6611 (syz.6.75), ts 190638130015, free_ts 189132482316
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1857
 prep_new_page mm/page_alloc.c:1865 [inline]
 get_page_from_freelist+0x28c0/0x2960 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab+0x86/0x3b0 mm/slub.c:3248
 new_slab mm/slub.c:3302 [inline]
 ___slab_alloc+0xb10/0x13e0 mm/slub.c:4656
 __slab_alloc+0xc6/0x1f0 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_noprof+0x101/0x6c0 mm/slub.c:5270
 xfs_buf_item_init+0x6a/0x6d0 fs/xfs/xfs_buf_item.c:878
 _xfs_trans_bjoin+0x46/0x110 fs/xfs/xfs_trans_buf.c:75
 xfs_trans_read_buf_map+0x28f/0x8a0 fs/xfs/xfs_trans_buf.c:325
 xfs_trans_read_buf fs/xfs/xfs_trans.h:210 [inline]
 xfs_imap_to_bp+0x127/0x2f0 fs/xfs/libxfs/xfs_inode_buf.c:139
 xfs_inode_item_precommit+0x729/0xb40 fs/xfs/xfs_inode_item.c:170
 xfs_trans_run_precommits fs/xfs/xfs_trans.c:800 [inline]
 __xfs_trans_commit+0x2e1/0xbe0 fs/xfs/xfs_trans.c:843
 xfs_trans_commit+0x13e/0x1c0 fs/xfs/xfs_trans.c:928
 xfs_vn_update_time+0x381/0x560 fs/xfs/xfs_iops.c:1226
page last free pid 6584 tgid 6584 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xc28/0x1810 mm/page_alloc.c:3000
 folios_put_refs+0x569/0x670 mm/swap.c:1002
 folio_batch_release include/linux/pagevec.h:101 [inline]
 truncate_inode_pages_range+0x349/0xd90 mm/truncate.c:408
 kill_bdev block/bdev.c:91 [inline]
 blkdev_flush_mapping+0x10c/0x2f0 block/bdev.c:729
 blkdev_put_whole block/bdev.c:736 [inline]
 bdev_release+0x422/0x660 block/bdev.c:1161
 blkdev_release+0x15/0x20 block/fops.c:706
 __fput+0x45b/0xa80 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888050da7c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888050da7c80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888050da7d00: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff888050da7d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888050da7e00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb
==================================================================