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BUG: KASAN: slab-use-after-free in jfs_lazycommit+0x12e/0xaa0
Read of size 8 at addr ffff8881be6ac638 by task jfsCommit/115

CPU: 1 UID: 0 PID: 115 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_report+0xba/0x230
 kasan_report+0x117/0x150
 jfs_lazycommit+0x12e/0xaa0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Allocated by task 19103:
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_noprof+0x35c/0x760
 tomoyo_realpath_from_path+0xe3/0x5d0
 tomoyo_check_open_permission+0x229/0x470
 security_file_open+0xa9/0x240
 do_dentry_open+0x384/0x14e0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 19103:
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c1/0x630
 tomoyo_realpath_from_path+0x598/0x5d0
 tomoyo_check_open_permission+0x229/0x470
 security_file_open+0xa9/0x240
 do_dentry_open+0x384/0x14e0
 vfs_open+0x3b/0x340
 path_openat+0x2e08/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8881be6ac000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 1592 bytes inside of
 freed 4096-byte region [ffff8881be6ac000, ffff8881be6ad000)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1be6a8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff888100042140 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
head: 057ff00000000040 ffff888100042140 dead000000000100 dead000000000122
head: 0000000000000000 0000000800040004 00000000f5000000 0000000000000000
head: 057ff00000000003 ffffea0006f9aa01 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 5264, tgid 5264 (udevd), ts 32212232186, free_ts 30915550027
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24dc/0x2580
 __alloc_frozen_pages_noprof+0x18d/0x380
 allocate_slab+0x77/0x660
 refill_objects+0x331/0x3c0
 __pcs_replace_empty_main+0x2e6/0x730
 __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+0x14d/0xf80
page last free pid 5266 tgid 5266 stack trace:
 __free_frozen_pages+0xc2b/0xdb0
 __slab_free+0x263/0x2b0
 qlist_free_all+0x97/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 kmem_cache_alloc_noprof+0x2bc/0x650
 do_getname+0x2e/0x250
 do_faccessat+0x635/0xde0
 __x64_sys_access+0x61/0x70
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff8881be6ac500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881be6ac580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881be6ac600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8881be6ac680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881be6ac700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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