loop0: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: use-after-free in dtMoveEntry fs/jfs/jfs_dtree.c:3931 [inline]
BUG: KASAN: use-after-free in dtSplitPage+0x1bce/0x36a0 fs/jfs/jfs_dtree.c:1558
Write of size 1 at addr ffff88801fda0000 by task syz.0.0/5325

CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 dtMoveEntry fs/jfs/jfs_dtree.c:3931 [inline]
 dtSplitPage+0x1bce/0x36a0 fs/jfs/jfs_dtree.c:1558
 dtSplitUp fs/jfs/jfs_dtree.c:1089 [inline]
 dtInsert+0x1080/0x5cb0 fs/jfs/jfs_dtree.c:868
 jfs_symlink+0x8a1/0xfb0 fs/jfs/namei.c:1021
 vfs_symlink+0x18b/0x330 fs/namei.c:5794
 filename_symlinkat+0x1cd/0x410 fs/namei.c:5819
 __do_sys_symlinkat fs/namei.c:5839 [inline]
 __se_sys_symlinkat+0x4e/0x2b0 fs/namei.c:5834
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81a9f9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f81aaef2fe8 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f81aa225fa0 RCX: 00007f81a9f9e159
RDX: 00002000000005c0 RSI: ffffffffffffff9c RDI: 0000200000000700
RBP: 00007f81aa03503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f81aa226038 R14: 00007f81aa225fa0 R15: 00007ffc6c902468
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x7f280d6a5 pfn:0x1fda0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffff88802fffbb50 ffffea00007f7408 0000000000000000
raw: 00000007f280d6a5 0000000000000002 00000000f0000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 4683, tgid 4683 (klogd), ts 102820396564
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486
 folio_alloc_mpol_noprof+0x39/0x160 mm/mempolicy.c:2505
 __swap_cache_alloc mm/swap_state.c:440 [inline]
 swap_cache_alloc_folio+0x2c1/0x990 mm/swap_state.c:530
 swap_cache_read_folio+0x44/0x120 mm/swap_state.c:652
 swap_cluster_readahead+0x392/0x630 mm/swap_state.c:849
 swapin_readahead+0x1a3/0xc50 mm/swap_state.c:997
 do_swap_page+0x3fb/0x4c10 mm/memory.c:4971
 handle_pte_fault mm/memory.c:6561 [inline]
 __handle_mm_fault mm/memory.c:6707 [inline]
 handle_mm_fault+0x1398/0x3750 mm/memory.c:6876
 do_user_addr_fault+0x746/0x1340 arch/x86/mm/fault.c:1394
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
page last free pid 71 tgid 71 ts 103668505640 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 free_unref_folios+0xdc2/0x14e0 mm/page_alloc.c:3022
 shrink_folio_list+0x4a2d/0x5250 mm/vmscan.c:1580
 evict_folios+0x3055/0x3fb0 mm/vmscan.c:4910
 try_to_shrink_lruvec+0xe3b/0x1340 mm/vmscan.c:5076
 shrink_one+0x233/0x730 mm/vmscan.c:5117
 shrink_many mm/vmscan.c:5180 [inline]
 lru_gen_shrink_node mm/vmscan.c:5258 [inline]
 shrink_node+0x35d0/0x3e30 mm/vmscan.c:6247
 kswapd_shrink_node mm/vmscan.c:7101 [inline]
 balance_pgdat mm/vmscan.c:7279 [inline]
 kswapd+0x185e/0x32c0 mm/vmscan.c:7555
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88801fd9ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801fd9ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801fda0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88801fda0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88801fda0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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