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BUG: KASAN: slab-use-after-free in jfs_lazycommit+0x12e/0xaa0
Read of size 8 at addr ffff88811386a628 by task jfsCommit/124

CPU: 0 UID: 0 PID: 124 Comm: jfsCommit Not tainted syzkaller #0 PREEMPT(full) 
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+0x12e/0xaa0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 10559:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x31c/0x660
 uevent_show+0x15a/0x310
 dev_attr_show+0x58/0xc0
 sysfs_kf_seq_show+0x310/0x490
 seq_read_iter+0x4ef/0xe10
 vfs_read+0x582/0xa70
 ksys_read+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 10559:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 uevent_show+0x1d7/0x310
 dev_attr_show+0x58/0xc0
 sysfs_kf_seq_show+0x310/0x490
 seq_read_iter+0x4ef/0xe10
 vfs_read+0x582/0xa70
 ksys_read+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88811386a000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 1576 bytes inside of
 freed 4096-byte region [ffff88811386a000, ffff88811386b000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113868
head: order:3 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 ffff888100042140 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
head: 017ff00000000040 ffff888100042140 dead000000000100 dead000000000122
head: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
head: 017ff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 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 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5070, tgid 5070 (udevd), ts 32894630826, free_ts 32860781527
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24ba/0x2540
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x339/0x3d0
 __pcs_replace_empty_main+0x321/0x720
 __kmalloc_noprof+0x474/0x760
 tomoyo_realpath_from_path+0xe3/0x5d0
 tomoyo_path_perm+0x283/0x560
 security_inode_getattr+0x12b/0x310
 vfs_getattr+0x23/0x70
 vfs_statx_path+0x2b/0x230
 vfs_statx+0x12e/0x200
 vfs_fstatat+0x11b/0x170
 __x64_sys_newfstatat+0x151/0x200
 do_syscall_64+0x15f/0xf80
page last free pid 5062 tgid 5062 stack trace:
 __free_frozen_pages+0xbc7/0xd30
 __slab_free+0x274/0x2c0
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2bc/0x650
 vm_area_dup+0x2b/0x680
 dup_mmap+0x8b1/0x1d90
 copy_mm+0x13b/0x4a0
 copy_process+0x1f1c/0x4450
 kernel_clone+0x284/0x8f0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88811386a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811386a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88811386a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88811386a680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811386a700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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