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BUG: KASAN: slab-use-after-free in jfs_lazycommit+0x630/0x94c fs/jfs/jfs_txnmgr.c:2737
Read of size 4 at addr ffff0000d11a7294 by task jfsCommit/100

CPU: 0 UID: 0 PID: 100 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380
 jfs_lazycommit+0x630/0x94c fs/jfs/jfs_txnmgr.c:2737
 kthread+0x5fc/0x75c kernel/kthread.c:463
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844

Allocated by task 7289:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:77
 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:573
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3a4/0x65c mm/slub.c:5771
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 jfs_fill_super+0xb8/0xb6c fs/jfs/super.c:452
 get_tree_bdev_flags+0x360/0x414 fs/super.c:1691
 get_tree_bdev+0x2c/0x3c fs/super.c:1714
 jfs_get_tree+0x28/0x38 fs/jfs/super.c:635
 vfs_get_tree+0x90/0x28c fs/super.c:1751
 fc_mount fs/namespace.c:1208 [inline]
 do_new_mount_fc fs/namespace.c:3651 [inline]
 do_new_mount+0x284/0x944 fs/namespace.c:3727
 path_mount+0x5b4/0xdfc fs/namespace.c:4037
 do_mount fs/namespace.c:4050 [inline]
 __do_sys_mount fs/namespace.c:4238 [inline]
 __se_sys_mount fs/namespace.c:4215 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4215
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x254 arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Freed by task 6553:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:77
 __kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2543 [inline]
 slab_free mm/slub.c:6642 [inline]
 kfree+0x184/0x600 mm/slub.c:6849
 jfs_put_super+0x144/0x188 fs/jfs/super.c:203
 generic_shutdown_super+0x12c/0x2b8 fs/super.c:642
 kill_block_super+0x44/0x90 fs/super.c:1722
 deactivate_locked_super+0xc4/0x12c fs/super.c:473
 deactivate_super+0xe0/0x100 fs/super.c:506
 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1327
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1334
 task_work_run+0x1dc/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xfc/0x178 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline]
 el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:725
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the object at ffff0000d11a7200
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 148 bytes inside of
 freed 256-byte region [ffff0000d11a7200, ffff0000d11a7300)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff0000d11a7000 pfn:0x1111a6
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000240(workingset|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000240 ffff0000c0001b40 fffffdffc3315890 fffffdffc3610590
raw: ffff0000d11a7000 000000000010000f 00000000f5000000 0000000000000000
head: 05ffc00000000240 ffff0000c0001b40 fffffdffc3315890 fffffdffc3610590
head: ffff0000d11a7000 000000000010000f 00000000f5000000 0000000000000000
head: 05ffc00000000001 fffffdffc3446981 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d11a7180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d11a7200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000d11a7280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff0000d11a7300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d11a7380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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