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BUG: KASAN: slab-use-after-free in jfs_lazycommit+0x771/0xac0
Read of size 4 at addr ffff88810f9e5a94 by task jfsCommit/125

CPU: 0 UID: 0 PID: 125 Comm: jfsCommit Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 jfs_lazycommit+0x771/0xac0
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 1006:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x318/0x660
 jfs_fill_super+0xc2/0xd90
 get_tree_bdev_flags+0x430/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x319/0xdc0
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 1049:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x40/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 do_exit+0x73a/0x2360
 do_group_exit+0x22d/0x2f0
 get_signal+0x121b/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 irqentry_exit+0x2aa/0x8e0
 asm_exc_page_fault+0x26/0x30

The buggy address belongs to the object at ffff88810f9e5a00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 148 bytes inside of
 freed 256-byte region [ffff88810f9e5a00, ffff88810f9e5b00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f9e4
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x17ff00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000040 ffff888100041b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 017ff00000000040 ffff888100041b40 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 017ff00000000001 ffffffffffffff81 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 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 6554, tgid 6554 (syz-executor), ts 113482063296, free_ts 113458524513
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x2007/0x2080
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x336/0x3d0
 __pcs_replace_empty_main+0x320/0x720
 __kmalloc_noprof+0x464/0x750
 fib_create_info+0x16fe/0x3170
 fib_table_insert+0xcb/0x1b10
 fib_magic+0x43b/0x530
 fib_add_ifaddr+0x3e6/0x5d0
 fib_netdev_event+0x382/0x490
 notifier_call_chain+0x1a5/0x3d0
 __dev_notify_flags+0x1aa/0x310
 netif_change_flags+0xde/0x1b0
 do_setlink+0xdd6/0x4670
page last free pid 6674 tgid 6674 stack trace:
 __free_frozen_pages+0xc93/0xda0
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2b8/0x650
 do_getname+0x2e/0x250
 user_statfs+0x97/0x1c0
 __x64_sys_statfs+0x120/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88810f9e5980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810f9e5a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88810f9e5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88810f9e5b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810f9e5b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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