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BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x12c6/0x3b20
Read of size 1 at addr ffff888031c24085 by task syz.1.69/6250

CPU: 1 UID: 0 PID: 6250 Comm: syz.1.69 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
 dtSplitPage+0x12c6/0x3b20
 dtInsert+0x109b/0x5f40
 jfs_create+0x6c8/0xa80
 path_openat+0x14f4/0x3830
 do_filp_open+0x1fa/0x410
 filp_open+0x176/0x1d0
 coredump_file+0x33e/0xaf0
 vfs_coredump+0x1688/0x2a50
 get_signal+0x1109/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fe0f438ebf1
Code: 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 <c3> 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:00000000fffffe10 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fe0f45c5fa0 RCX: 00007fe0f438ebe9
RDX: 0000000000000000 RSI: 00000000fffffe10 RDI: 0000000000000000
RBP: 00007fe0f4411e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe0f45c6038 R14: 00007fe0f45c5fa0 R15: 00007ffd9bffae68
 </TASK>

Allocated by task 6231:
 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 ffff888031c23750
 which belongs to the cache jfs_ip of size 2232
The buggy address is located 125 bytes to the right of
 allocated 2232-byte region [ffff888031c23750, ffff888031c24008)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x31c20
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888026c93201
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801ecae640 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff888026c93201
head: 00fff00000000040 ffff88801ecae640 dead000000000122 0000000000000000
head: 0000000000000000 00000000800d000d 00000000f5000000 ffff888026c93201
head: 00fff00000000003 ffffea0000c70801 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 6231, tgid 6229 (syz.1.69), ts 70728858537, free_ts 69406222066
 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
 jfs_fill_super+0x569/0xd80
 get_tree_bdev_flags+0x40e/0x4d0
 vfs_get_tree+0x92/0x2b0
 do_new_mount+0x2a2/0x9e0
 __se_sys_mount+0x317/0x410
 do_syscall_64+0xfa/0x3b0
page last free pid 5854 tgid 5854 stack trace:
 __free_pages_ok+0xa83/0xbe0
 free_large_kmalloc+0x13a/0x1f0
 btree_node_sort+0x117f/0x1760
 bch2_btree_post_write_cleanup+0x11f/0xad0
 bch2_btree_node_write_trans+0x17b/0x760
 __btree_node_flush+0x323/0x430
 bch2_btree_node_flush1+0x2a/0x40
 journal_flush_pins+0x8e3/0xe90
 journal_flush_done+0x112/0x810
 bch2_journal_flush_pins+0x155/0x250
 __bch2_fs_read_only+0x144/0x5b0
 bch2_fs_read_only+0x42a/0xb00
 __bch2_fs_stop+0x100/0x900
 generic_shutdown_super+0x135/0x2c0
 bch2_kill_sb+0x41/0x50
 deactivate_locked_super+0xbc/0x130

Memory state around the buggy address:
 ffff888031c23f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888031c24000: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888031c24080: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888031c24100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888031c24180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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