ERROR: (device loop0): txCommit: 
sch_tbf: burst 4398 is lower than device lo mtu (65550) !
==================================================================
BUG: KASAN: slab-out-of-bounds in dtInsertEntry+0xe9a/0x1430
Read of size 4 at addr ffff88811af79b3c by task syz.0.1135/14961

CPU: 0 UID: 0 PID: 14961 Comm: syz.0.1135 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+0x189/0x250
 print_report+0xca/0x240
 kasan_report+0x118/0x150
 dtInsertEntry+0xe9a/0x1430
 dtSplitPage+0x2a83/0x3b20
 dtInsert+0x109b/0x5f40
 jfs_mkdir+0x6ec/0xa70
 vfs_mkdir+0x306/0x510
 do_mkdirat+0x247/0x590
 __x64_sys_mkdirat+0x87/0xa0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd47ad8d457
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd47bb2ee68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fd47bb2eef0 RCX: 00007fd47ad8d457
RDX: 00000000000001ff RSI: 00002000000000c0 RDI: 00000000ffffff9c
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007fd47bb2eeb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

Allocated by task 14961:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_lru_noprof+0x1c6/0x3d0
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 iget_locked+0xf0/0x570
 jfs_iget+0x24/0x3e0
 jfs_lookup+0x1c5/0x380
 __lookup_slow+0x297/0x3d0
 lookup_slow+0x53/0x70
 walk_component+0x2d2/0x400
 path_lookupat+0x163/0x430
 filename_lookup+0x212/0x570
 user_path_at+0x3a/0x60
 __se_sys_chdir+0x91/0x280
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88811af79270
 which belongs to the cache jfs_ip of size 2232
The buggy address is located 20 bytes to the right of
 allocated 2232-byte region [ffff88811af79270, ffff88811af79b28)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11af78
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888108d55c01
flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 057ff00000000040 ffff88801ee24dc0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff888108d55c01
head: 057ff00000000040 ffff88801ee24dc0 dead000000000122 0000000000000000
head: 0000000000000000 00000000800d000d 00000000f5000000 ffff888108d55c01
head: 057ff00000000003 ffffea00046bde01 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 Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 11378, tgid 11367 (syz.8.730), ts 272272187153, free_ts 246812063552
 post_alloc_hook+0x240/0x2a0
 get_page_from_freelist+0x21e4/0x22c0
 __alloc_frozen_pages_noprof+0x181/0x370
 alloc_pages_mpol+0x232/0x4a0
 allocate_slab+0x8a/0x370
 ___slab_alloc+0xbeb/0x1410
 kmem_cache_alloc_lru_noprof+0x288/0x3d0
 jfs_alloc_inode+0x28/0x70
 alloc_inode+0x6a/0x1b0
 new_inode+0x22/0x170
 ialloc+0x4c/0x8f0
 jfs_create+0x18d/0xa80
 path_openat+0x14f4/0x3830
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x1c0
 __x64_sys_creat+0x8f/0xc0
page last free pid 10593 tgid 10593 stack trace:
 __free_frozen_pages+0xbc4/0xd30
 free_large_kmalloc+0x13a/0x1f0
 __btree_node_data_free+0x2bb/0x3a0
 btree_node_data_free+0x13f/0x340
 bch2_fs_btree_cache_exit+0x9c1/0x13c0
 bch2_fs_release+0x2bb/0x830
 kobject_put+0x22b/0x480
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88811af79a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811af79a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88811af79b00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
                                        ^
 ffff88811af79b80: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb
 ffff88811af79c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
