==================================================================
BUG: KASAN: slab-use-after-free in jfs_lazycommit+0x6e1/0xa20 fs/jfs/jfs_txnmgr.c:2738
Read of size 4 at addr ffff88802718d294 by task jfsCommit/129

CPU: 0 UID: 0 PID: 129 Comm: jfsCommit Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [  209.570281][  T129] Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 jfs_lazycommit+0x6e1/0xa20 fs/jfs/jfs_txnmgr.c:2738
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 7175:
 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+0x3cd/0x670 mm/slub.c:5491
 _kmalloc_noprof include/linux/slab.h:969 [inline]
 _kzalloc_noprof include/linux/slab.h:1290 [inline]
 jfs_fill_super+0xc2/0xda0 fs/jfs/super.c:452
 get_tree_bdev_flags+0x430/0x4f0 fs/super.c:1881
 vfs_get_tree+0x92/0x2a0 fs/super.c:1941
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3777 [inline]
 do_new_mount+0x319/0xdc0 fs/namespace.c:3853
 do_mount fs/namespace.c:4186 [inline]
 __do_sys_mount fs/namespace.c:4402 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4379
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5598:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x40/0x50 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:2705 [inline]
 slab_free mm/slub.c:6381 [inline]
 kfree+0x1c5/0x6c0 mm/slub.c:6696
 generic_shutdown_super+0x13d/0x2d0 fs/super.c:769
 kill_block_super+0x44/0xa0 fs/super.c:1912
 deactivate_locked_super+0xbc/0x110 fs/super.c:603
 cleanup_mnt+0x3d3/0x460 fs/namespace.c:1317
 task_work_run+0x1d9/0x270 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:70 [inline]
 exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802718d200
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 148 bytes inside of
 freed 256-byte region [ffff88802718d200, ffff88802718d300)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802718ca00 pfn:0x2718c
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x80000000000240(workingset|head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000240 ffff88813feb4b40 ffffea0000e78d90 ffffea0000ded110
raw: ffff88802718ca00 000000080010000f 00000000f5000000 0000000000000000
head: 0080000000000240 ffff88813feb4b40 ffffea0000e78d90 ffffea0000ded110
head: ffff88802718ca00 000000080010000f 00000000f5000000 0000000000000000
head: 0080000000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5605, tgid 5605 (syz-executor), ts 91462903391
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1861
 prep_new_page mm/page_alloc.c:1869 [inline]
 get_page_from_freelist+0x264c/0x26c0 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x1a6/0x390 mm/page_alloc.c:5313
 alloc_slab_page mm/slub.c:3294 [inline]
 allocate_slab+0x79/0x5e0 mm/slub.c:3408
 new_slab mm/slub.c:3454 [inline]
 refill_objects+0x2d8/0x350 mm/slub.c:7314
 refill_sheaf mm/slub.c:2832 [inline]
 __pcs_replace_empty_main+0x330/0x690 mm/slub.c:4697
 alloc_from_pcs mm/slub.c:4773 [inline]
 slab_alloc_node mm/slub.c:4907 [inline]
 __do_kmalloc_node mm/slub.c:5335 [inline]
 __kmalloc_noprof+0x543/0x790 mm/slub.c:5361
 _kmalloc_noprof include/linux/slab.h:973 [inline]
 _kzalloc_noprof include/linux/slab.h:1290 [inline]
 fib_create_info+0x16fe/0x3170 net/ipv4/fib_semantics.c:1398
 fib_table_insert+0xcb/0x1b10 net/ipv4/fib_trie.c:1212
 fib_magic+0x43b/0x530 net/ipv4/fib_frontend.c:1147
 fib_add_ifaddr+0x139/0x5d0 net/ipv4/fib_frontend.c:1169
 fib_netdev_event+0x382/0x490 net/ipv4/fib_frontend.c:1529
 notifier_call_chain+0x1a5/0x3d0 kernel/notifier.c:85
 call_netdevice_notifiers_extack net/core/dev.c:2289 [inline]
 call_netdevice_notifiers net/core/dev.c:2303 [inline]
 __dev_notify_flags+0x1aa/0x310 net/core/dev.c:9800
 netif_change_flags+0xde/0x1b0 net/core/dev.c:9829
 do_setlink+0xdd6/0x4670 net/core/rtnetlink.c:3215
page last free pid 5805 tgid 5805 ts 91451217852 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1408 [inline]
 __free_frozen_pages+0x10de/0x11c0 mm/page_alloc.c:2952
 __slab_free+0x252/0x2a0 mm/slub.c:5743
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4606 [inline]
 slab_alloc_node mm/slub.c:4919 [inline]
 kmem_cache_alloc_lru_noprof+0x355/0x670 mm/slub.c:4952
 proc_alloc_inode+0x2a/0xc0 fs/proc/inode.c:57
 alloc_inode+0x6a/0x1b0 fs/inode.c:338
 new_inode+0x1f/0x170 fs/inode.c:1171
 proc_pid_make_inode+0x21/0x130 fs/proc/base.c:1932
 proc_pid_make_base_inode fs/proc/base.c:1983 [inline]
 proc_pid_instantiate+0x54/0x2a0 fs/proc/base.c:3459
 proc_pid_lookup+0x2fa/0x420 fs/proc/base.c:3502
 proc_root_lookup+0x20/0x50 fs/proc/root.c:417
 __lookup_slow+0x1fb/0x2f0 fs/namei.c:1919
 lookup_slow+0x53/0x70 fs/namei.c:1936
 walk_component fs/namei.c:2282 [inline]
 link_path_walk+0x12a5/0x1910 fs/namei.c:2653

Memory state around the buggy address:
 ffff88802718d180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802718d200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88802718d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88802718d300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802718d380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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