syzbot

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BUG: KASAN: slab-use-after-free in iomap_finish_ioend+0x586/0x620 fs/iomap/buffered-io.c:1517
Read of size 8 at addr ffff88805f0d66e0 by task kworker/0:2/787

CPU: 0 PID: 787 Comm: kworker/0:2 Not tainted 6.6.93-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: xfs-conv/loop9 xfs_end_io
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xac/0x230 mm/kasan/report.c:475
 kasan_report+0x151/0x180 mm/kasan/report.c:588
 iomap_finish_ioend+0x586/0x620 fs/iomap/buffered-io.c:1517
 iomap_finish_ioends+0x117/0x2b0 fs/iomap/buffered-io.c:1541
 xfs_end_ioend+0x367/0x470 fs/xfs/xfs_aops.c:136
 xfs_end_io+0x254/0x2d0 fs/xfs/xfs_aops.c:173
 process_one_work kernel/workqueue.c:2634 [inline]
 process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
 worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
 </TASK>

Allocated by task 14356:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3485 [inline]
 slab_alloc mm/slub.c:3493 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3500 [inline]
 kmem_cache_alloc_lru+0x115/0x2e0 mm/slub.c:3516
 alloc_inode_sb include/linux/fs.h:2946 [inline]
 xfs_inode_alloc+0x80/0x6c0 fs/xfs/xfs_icache.c:81
 xfs_iget_cache_miss fs/xfs/xfs_icache.c:611 [inline]
 xfs_iget+0xa94/0x2db0 fs/xfs/xfs_icache.c:777
 xfs_lookup+0x250/0x400 fs/xfs/xfs_inode.c:669
 xfs_vn_lookup+0x119/0x1e0 fs/xfs/xfs_iops.c:304
 lookup_open fs/namei.c:3466 [inline]
 open_last_lookups fs/namei.c:3556 [inline]
 path_openat+0x10b8/0x3190 fs/namei.c:3786
 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
 do_sys_open fs/open.c:1434 [inline]
 __do_sys_openat fs/open.c:1450 [inline]
 __se_sys_openat fs/open.c:1445 [inline]
 __x64_sys_openat+0x139/0x160 fs/open.c:1445
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 22:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1806 [inline]
 slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1832
 slab_free mm/slub.c:3816 [inline]
 kmem_cache_free+0xf8/0x280 mm/slub.c:3838
 rcu_do_batch kernel/rcu/tree.c:2190 [inline]
 rcu_core+0xcc4/0x1720 kernel/rcu/tree.c:2463
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 run_ksoftirqd+0x9c/0xf0 kernel/softirq.c:950
 smpboot_thread_fn+0x635/0xa00 kernel/smpboot.c:164
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
 __call_rcu_common kernel/rcu/tree.c:2713 [inline]
 call_rcu+0x14f/0x920 kernel/rcu/tree.c:2829
 __xfs_inode_free fs/xfs/xfs_icache.c:161 [inline]
 xfs_reclaim_inode fs/xfs/xfs_icache.c:942 [inline]
 xfs_icwalk_process_inode fs/xfs/xfs_icache.c:1632 [inline]
 xfs_icwalk_ag+0x138d/0x1a80 fs/xfs/xfs_icache.c:1714
 xfs_icwalk fs/xfs/xfs_icache.c:1763 [inline]
 xfs_reclaim_inodes+0x18c/0x260 fs/xfs/xfs_icache.c:975
 xfs_unmount_flush_inodes+0xaf/0xc0 fs/xfs/xfs_mount.c:595
 xfs_unmountfs+0xc4/0x270 fs/xfs/xfs_mount.c:1075
 xfs_fs_put_super+0x65/0x140 fs/xfs/xfs_super.c:1142
 generic_shutdown_super+0x134/0x2b0 fs/super.c:693
 kill_block_super+0x44/0x90 fs/super.c:1660
 xfs_kill_sb+0x15/0x50 fs/xfs/xfs_super.c:2032
 deactivate_locked_super+0x97/0x100 fs/super.c:481
 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250
 task_work_run+0x1ce/0x250 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Second to last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
 insert_work+0x3d/0x310 kernel/workqueue.c:1651
 __queue_work+0xc39/0x1020 kernel/workqueue.c:1800
 queue_work_on+0x121/0x1e0 kernel/workqueue.c:1835
 queue_work include/linux/workqueue.h:562 [inline]
 xfs_end_bio+0xf4/0x200 fs/xfs/xfs_aops.c:188
 iomap_submit_ioend fs/iomap/buffered-io.c:1656 [inline]
 iomap_writepages+0x1ba/0x210 fs/iomap/buffered-io.c:2004
 xfs_vm_writepages+0x103/0x160 fs/xfs/xfs_aops.c:480
 do_writepages+0x3a2/0x600 mm/page-writeback.c:2575
 filemap_fdatawrite_wbc+0x122/0x180 mm/filemap.c:390
 __filemap_fdatawrite_range mm/filemap.c:423 [inline]
 file_write_and_wait_range+0x171/0x240 mm/filemap.c:781
 xfs_file_fsync+0x197/0x9c0 fs/xfs/xfs_file.c:144
 generic_write_sync include/linux/fs.h:2651 [inline]
 xfs_file_buffered_write+0x854/0x940 fs/xfs/xfs_file.c:816
 do_iter_readv_writev fs/read_write.c:-1 [inline]
 do_iter_write+0x79a/0xc70 fs/read_write.c:860
 vfs_writev fs/read_write.c:933 [inline]
 do_pwritev+0x205/0x340 fs/read_write.c:1030
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88805f0d64c0
 which belongs to the cache xfs_inode of size 1808
The buggy address is located 544 bytes inside of
 freed 1808-byte region [ffff88805f0d64c0, ffff88805f0d6bd0)

The buggy address belongs to the physical page:
page:ffffea00017c3400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88805f0d5d00 pfn:0x5f0d0
head:ffffea00017c3400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88802f271c01
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888141ea3b40 dead000000000122 0000000000000000
raw: ffff88805f0d5d00 0000000080100002 00000001ffffffff ffff88802f271c01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 6570, tgid 6569 (syz.3.238), ts 154203425806, free_ts 151907266687
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 alloc_slab_page+0x5d/0x170 mm/slub.c:1876
 allocate_slab mm/slub.c:2023 [inline]
 new_slab+0x87/0x2e0 mm/slub.c:2076
 ___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
 __slab_alloc mm/slub.c:3329 [inline]
 __slab_alloc_node mm/slub.c:3382 [inline]
 slab_alloc_node mm/slub.c:3475 [inline]
 slab_alloc mm/slub.c:3493 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3500 [inline]
 kmem_cache_alloc_lru+0x1ae/0x2e0 mm/slub.c:3516
 alloc_inode_sb include/linux/fs.h:2946 [inline]
 xfs_inode_alloc+0x80/0x6c0 fs/xfs/xfs_icache.c:81
 xfs_iget_cache_miss fs/xfs/xfs_icache.c:611 [inline]
 xfs_iget+0xa94/0x2db0 fs/xfs/xfs_icache.c:777
 xfs_mountfs+0xdac/0x1d20 fs/xfs/xfs_mount.c:851
 xfs_fs_fill_super+0x112f/0x13a0 fs/xfs/xfs_super.c:1738
 get_tree_bdev+0x3e4/0x510 fs/super.c:1591
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3355
 do_mount fs/namespace.c:3695 [inline]
 __do_sys_mount fs/namespace.c:3904 [inline]
 __se_sys_mount+0x2da/0x3c0 fs/namespace.c:3881
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1154 [inline]
 free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
 __slab_free+0x35e/0x410 mm/slub.c:3722
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3485 [inline]
 slab_alloc mm/slub.c:3493 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3500 [inline]
 kmem_cache_alloc+0x11e/0x2e0 mm/slub.c:3509
 getname_flags+0xbb/0x500 fs/namei.c:140
 getname fs/namei.c:219 [inline]
 __do_sys_symlink fs/namei.c:4520 [inline]
 __se_sys_symlink fs/namei.c:4518 [inline]
 __x64_sys_symlink+0x5f/0x90 fs/namei.c:4518
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88805f0d6580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805f0d6600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88805f0d6680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88805f0d6700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805f0d6780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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