==================================================================
BUG: KASAN: slab-use-after-free in metapage_write_folio+0xc95/0xcf0 fs/jfs/jfs_metapage.c:461
Read of size 4 at addr ffff888028047210 by task kworker/u8:5/116

CPU: 0 UID: 0 PID: 116 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: writeback wb_workfn (flush-7:7)
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 metapage_write_folio+0xc95/0xcf0 fs/jfs/jfs_metapage.c:461
 metapage_writepages+0xe8/0x1a0 fs/jfs/jfs_metapage.c:558
 do_writepages+0x32e/0x550 mm/page-writeback.c:2598
 __writeback_single_inode+0x133/0x1230 fs/fs-writeback.c:1737
 writeback_sb_inodes+0x92e/0x1910 fs/fs-writeback.c:2030
 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2107
 wb_writeback+0x459/0xad0 fs/fs-writeback.c:2218
 wb_check_old_data_flush fs/fs-writeback.c:2322 [inline]
 wb_do_writeback fs/fs-writeback.c:2375 [inline]
 wb_workfn+0xaf3/0xf00 fs/fs-writeback.c:2403
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xaec/0x17a0 kernel/workqueue.c:3340
 worker_thread+0x89f/0xd90 kernel/workqueue.c:3421
 kthread+0x726/0x8b0 kernel/kthread.c:463
 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Allocated by task 8041:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x1f2/0x6b0 mm/slub.c:5776
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 open_inline_log fs/jfs/jfs_logmgr.c:1159 [inline]
 lmLogOpen+0x2d1/0xfa0 fs/jfs/jfs_logmgr.c:1069
 jfs_mount_rw+0xee/0x670 fs/jfs/jfs_mount.c:257
 jfs_fill_super+0x754/0xd80 fs/jfs/super.c:532
 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1691
 vfs_get_tree+0x92/0x2a0 fs/super.c:1751
 fc_mount fs/namespace.c:1199 [inline]
 do_new_mount_fc fs/namespace.c:3636 [inline]
 do_new_mount+0x329/0xa50 fs/namespace.c:3712
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 8041:
 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]
 kfree+0x1bb/0x8f0 mm/slub.c:6878
 lmLogClose+0x297/0x520 fs/jfs/jfs_logmgr.c:-1
 jfs_reconfigure+0x6f6/0xa00 fs/jfs/super.c:421
 reconfigure_super+0x227/0x8a0 fs/super.c:1077
 do_remount fs/namespace.c:3264 [inline]
 path_mount+0xd3e/0x1000 fs/namespace.c:4014
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888028047000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 528 bytes inside of
 freed 1024-byte region [ffff888028047000, ffff888028047400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28040
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88813fe26dc0 ffffea00012f7200 dead000000000002
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 0080000000000040 ffff88813fe26dc0 ffffea00012f7200 dead000000000002
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 0080000000000003 ffffea0000a01001 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 13, tgid 13 (kworker/u8:1), ts 15578256446, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884
 prep_new_page mm/page_alloc.c:1892 [inline]
 get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3945
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240
 alloc_slab_page mm/slub.c:3077 [inline]
 allocate_slab+0x7a/0x3a0 mm/slub.c:3248
 new_slab mm/slub.c:3302 [inline]
 ___slab_alloc+0xaf8/0x13d0 mm/slub.c:4656
 __slab_alloc+0xc5/0x1f0 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 __do_kmalloc_node mm/slub.c:5656 [inline]
 __kmalloc_node_noprof+0x2bb/0x800 mm/slub.c:5663
 kmalloc_node_noprof include/linux/slab.h:987 [inline]
 blk_alloc_flush_queue+0xe7/0x240 block/blk-flush.c:490
 blk_mq_init_hctx block/blk-mq.c:3988 [inline]
 blk_mq_alloc_and_init_hctx+0x7bd/0xc70 block/blk-mq.c:4523
 __blk_mq_realloc_hw_ctxs+0x2bd/0x670 block/blk-mq.c:4570
 blk_mq_realloc_hw_ctxs block/blk-mq.c:4607 [inline]
 blk_mq_init_allocated_queue+0x35c/0x13a0 block/blk-mq.c:4637
 blk_mq_alloc_queue+0x1ba/0x2e0 block/blk-mq.c:4419
 scsi_alloc_sdev+0x7b0/0xc20 drivers/scsi/scsi_scan.c:339
 scsi_probe_and_add_lun+0x200/0x4830 drivers/scsi/scsi_scan.c:1218
 __scsi_scan_target+0x1f0/0xe10 drivers/scsi/scsi_scan.c:1789
 scsi_scan_channel drivers/scsi/scsi_scan.c:1877 [inline]
 scsi_scan_host_selected+0x375/0x690 drivers/scsi/scsi_scan.c:1906
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888028047100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888028047180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888028047200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff888028047280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888028047300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================