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SubjectRe: [syzbot] [reiserfs?] BUG: unable to handle kernel paging request in reiserfs_readdir_inode
syzbot has found a reproducer for the following issue on:

HEAD commit: 6f08c1de13a9 Add linux-next specific files for 20230317
git tree: linux-next
kernel config:
dashboard link:
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:
C reproducer:

Downloadable assets:
disk image:
kernel image:
mounted in repro:

IMPORTANT: if you fix the issue, please add the following tag to the commit:

REISERFS (device loop0): Using r5 hash to sort names
BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: use-after-free in test_bit_le include/asm-generic/bitops/le.h:21 [inline]
BUG: KASAN: use-after-free in reiserfs_readdir_inode+0xb0d/0x13b0 fs/reiserfs/dir.c:147
Read of size 8 at addr ffff88807384d000 by task syz-executor532/5096

CPU: 0 PID: 5096 Comm: syz-executor532 Not tainted 6.3.0-rc2-next-20230317-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
print_report mm/kasan/report.c:462 [inline]
kasan_report+0x11c/0x130 mm/kasan/report.c:572
check_region_inline mm/kasan/generic.c:181 [inline]
kasan_check_range+0x141/0x190 mm/kasan/generic.c:187
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
test_bit_le include/asm-generic/bitops/le.h:21 [inline]
reiserfs_readdir_inode+0xb0d/0x13b0 fs/reiserfs/dir.c:147
iterate_dir+0x56e/0x6f0 fs/readdir.c:65
__do_sys_getdents64 fs/readdir.c:369 [inline]
__se_sys_getdents64 fs/readdir.c:354 [inline]
__x64_sys_getdents64+0x13e/0x2c0 fs/readdir.c:354
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
RIP: 0033:0x7fc13aaf8939
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe499b2a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 0000000000012701 RCX: 00007fc13aaf8939
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 00007ffe499b2a90 R09: 00007ffe499b2a90
R10: 0000000000001131 R11: 0000000000000246 R12: 00007ffe499b2a8c
R13: 00007ffe499b2ac0 R14: 00007ffe499b2aa0 R15: 0000000000000005

The buggy address belongs to the physical page:
page:ffffea0001ce1340 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x7384d
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 ffffea0001ce1388 ffff8880b9943620 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 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 5086, tgid 5086 (udevd), ts 77632421048, free_ts 77634242475
prep_new_page mm/page_alloc.c:2472 [inline]
get_page_from_freelist+0xf75/0x2ab0 mm/page_alloc.c:4236
__alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5502
__folio_alloc+0x16/0x40 mm/page_alloc.c:5534
vma_alloc_folio+0x155/0x850 mm/mempolicy.c:2244
shmem_alloc_folio+0x119/0x1e0 mm/shmem.c:1557
shmem_alloc_and_acct_folio+0x15e/0x5d0 mm/shmem.c:1581
shmem_get_folio_gfp+0xa86/0x1a80 mm/shmem.c:1926
shmem_get_folio mm/shmem.c:2057 [inline]
shmem_write_begin+0x14a/0x380 mm/shmem.c:2663
generic_perform_write+0x256/0x570 mm/filemap.c:3921
__generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4049
generic_file_write_iter+0xe3/0x350 mm/filemap.c:4081
call_write_iter include/linux/fs.h:1854 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9f6/0xe20 fs/read_write.c:584
ksys_write+0x12b/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1468 [inline]
free_unref_page_prepare+0x4d1/0xb60 mm/page_alloc.c:3298
free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:3439
release_pages+0xcd7/0x1380 mm/swap.c:1042
__pagevec_release+0x77/0xe0 mm/swap.c:1062
pagevec_release include/linux/pagevec.h:63 [inline]
folio_batch_release include/linux/pagevec.h:132 [inline]
shmem_undo_range+0x5c0/0x1350 mm/shmem.c:929
shmem_truncate_range mm/shmem.c:1027 [inline]
shmem_evict_inode+0x32f/0xb60 mm/shmem.c:1142
evict+0x2ed/0x6b0 fs/inode.c:665
iput_final fs/inode.c:1748 [inline]
iput fs/inode.c:1774 [inline]
iput+0x4a7/0x7a0 fs/inode.c:1760
dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401
__dentry_kill+0x3c0/0x640 fs/dcache.c:607
dentry_kill fs/dcache.c:745 [inline]
dput+0x6ac/0xe10 fs/dcache.c:913
do_renameat2+0xb72/0xc90 fs/namei.c:4925
__do_sys_rename fs/namei.c:4969 [inline]
__se_sys_rename fs/namei.c:4967 [inline]
__x64_sys_rename+0x81/0xa0 fs/namei.c:4967
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80

Memory state around the buggy address:
ffff88807384cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88807384cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807384d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88807384d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88807384d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

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