Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_evictable (3)

syzbot
2024-12-15T05:35:02Z

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in folio_evictable

==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline]
BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
BUG: KASAN: slab-use-after-free in mapping_unevictable include/linux/pagemap.h:269 [inline]
BUG: KASAN: slab-use-after-free in folio_evictable+0xe3/0x250 mm/internal.h:435
Read of size 8 at addr ffff88804fd613a0 by task syz.0.23/6094

CPU: 0 UID: 0 PID: 6094 Comm: syz.0.23 Not tainted 6.13.0-rc2-syzkaller-00362-g2d8308bf5b67-dirty #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x169/0x550 mm/kasan/report.c:489
kasan_report+0x143/0x180 mm/kasan/report.c:602
kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
instrument_atomic_read include/linux/instrumented.h:68 [inline]
_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
mapping_unevictable include/linux/pagemap.h:269 [inline]
folio_evictable+0xe3/0x250 mm/internal.h:435
sort_folio mm/vmscan.c:4299 [inline]
scan_folios mm/vmscan.c:4424 [inline]
isolate_folios mm/vmscan.c:4550 [inline]
evict_folios+0xff2/0x5800 mm/vmscan.c:4581
try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4789
shrink_one+0x3b9/0x850 mm/vmscan.c:4834
shrink_many mm/vmscan.c:4897 [inline]
lru_gen_shrink_node mm/vmscan.c:4975 [inline]
shrink_node+0x37c5/0x3e50 mm/vmscan.c:5956
shrink_zones mm/vmscan.c:6215 [inline]
do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6277
try_to_free_pages+0x47c/0x1050 mm/vmscan.c:6527
__perform_reclaim mm/page_alloc.c:3927 [inline]
__alloc_pages_direct_reclaim+0x178/0x3c0 mm/page_alloc.c:3949
__alloc_pages_slowpath+0x764/0x1020 mm/page_alloc.c:4380
__alloc_pages_noprof+0x49b/0x710 mm/page_alloc.c:4764
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269
folio_alloc_mpol_noprof+0x36/0x50 mm/mempolicy.c:2287
shmem_alloc_folio mm/shmem.c:1794 [inline]
shmem_alloc_and_add_folio+0x4a0/0x1080 mm/shmem.c:1833
shmem_get_folio_gfp+0x621/0x1840 mm/shmem.c:2355
shmem_get_folio mm/shmem.c:2461 [inline]
shmem_write_begin+0x165/0x350 mm/shmem.c:3117
generic_perform_write+0x346/0x990 mm/filemap.c:4055
shmem_file_write_iter+0xf9/0x120 mm/shmem.c:3293
new_sync_write fs/read_write.c:586 [inline]
vfs_write+0xaeb/0xd30 fs/read_write.c:679
ksys_write+0x18f/0x2b0 fs/read_write.c:731
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fee41f847cf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007fee42e47df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000001000000 RCX: 00007fee41f847cf
RDX: 0000000001000000 RSI: 00007fee38c00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000001274a
R10: 0000000020000142 R11: 0000000000000293 R12: 0000000000000003
R13: 00007fee42e47ef0 R14: 00007fee42e47eb0 R15: 00007fee38c00000
</TASK>

Allocated by task 6026:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4119 [inline]
slab_alloc_node mm/slub.c:4168 [inline]
kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4175
gfs2_glock_get+0x309/0x1010 fs/gfs2/glock.c:1178
gfs2_inode_lookup+0x2a3/0xc90 fs/gfs2/inode.c:135
gfs2_dir_search+0x229/0x2f0 fs/gfs2/dir.c:1667
gfs2_lookupi+0x461/0x5e0 fs/gfs2/inode.c:340
gfs2_jindex_hold fs/gfs2/ops_fstype.c:587 [inline]
init_journal+0x602/0x2470 fs/gfs2/ops_fstype.c:729
init_inodes+0xdc/0x320 fs/gfs2/ops_fstype.c:866
gfs2_fill_super+0x1bd1/0x24d0 fs/gfs2/ops_fstype.c:1251
get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x90/0x2b0 fs/super.c:1814
do_new_mount+0x2be/0xb40 fs/namespace.c:3507
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 6014:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2353 [inline]
slab_free mm/slub.c:4613 [inline]
kmem_cache_free+0x195/0x410 mm/slub.c:4715
rcu_do_batch kernel/rcu/tree.c:2567 [inline]
rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823
handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561
do_softirq+0x11b/0x1e0 kernel/softirq.c:462
__local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:389
ipv6_get_lladdr+0x295/0x3d0 net/ipv6/addrconf.c:1936
mld_newpack+0x337/0xaf0 net/ipv6/mcast.c:1755
add_grhead net/ipv6/mcast.c:1850 [inline]
add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1988
mld_send_cr net/ipv6/mcast.c:2114 [inline]
mld_ifc_work+0x691/0xd90 net/ipv6/mcast.c:2651
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Last potentially related work creation:
kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
__kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544
__call_rcu_common kernel/rcu/tree.c:3086 [inline]
call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190
__gfs2_glock_free+0xda0/0xef0 fs/gfs2/glock.c:172
gfs2_glock_free+0x3c/0xb0 fs/gfs2/glock.c:178
gfs2_glock_put_eventually fs/gfs2/super.c:1257 [inline]
gfs2_evict_inode+0x6e2/0x13c0 fs/gfs2/super.c:1546
evict+0x4e8/0x9a0 fs/inode.c:796
gfs2_jindex_free+0x3f6/0x4b0 fs/gfs2/super.c:79
init_journal+0xa46/0x2470 fs/gfs2/ops_fstype.c:848
init_inodes+0xdc/0x320 fs/gfs2/ops_fstype.c:866
gfs2_fill_super+0x1bd1/0x24d0 fs/gfs2/ops_fstype.c:1251
get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x90/0x2b0 fs/super.c:1814
do_new_mount+0x2be/0xb40 fs/namespace.c:3507
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Second to last potentially related work creation:
kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47
__kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:544
insert_work+0x3e/0x330 kernel/workqueue.c:2183
__queue_work+0xc8b/0xf50 kernel/workqueue.c:2339
queue_delayed_work_on+0x1ca/0x390 kernel/workqueue.c:2552
queue_delayed_work include/linux/workqueue.h:677 [inline]
gfs2_glock_queue_work fs/gfs2/glock.c:250 [inline]
do_xmote+0xaf8/0x1250 fs/gfs2/glock.c:832
glock_work_func+0x343/0x5c0 fs/gfs2/glock.c:1090
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff88804fd60fd8
which belongs to the cache gfs2_glock(aspace) of size 1224
The buggy address is located 968 bytes inside of
freed 1224-byte region [ffff88804fd60fd8, ffff88804fd614a0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4fd60
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801fa6cdc0 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000001f5000000 0000000000000000
head: 04fff00000000040 ffff88801fa6cdc0 dead000000000122 0000000000000000
head: 0000000000000000 00000000800c000c 00000001f5000000 0000000000000000
head: 04fff00000000002 ffffea00013f5801 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6026, tgid 6025 (syz.0.16), ts 112070887808, free_ts 112070839340
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
prep_new_page mm/page_alloc.c:1564 [inline]
get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3474
__alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2269
alloc_slab_page+0x6a/0x110 mm/slub.c:2423
allocate_slab+0x5a/0x2b0 mm/slub.c:2589
new_slab mm/slub.c:2642 [inline]
___slab_alloc+0xc27/0x14a0 mm/slub.c:3830
__slab_alloc+0x58/0xa0 mm/slub.c:3920
__slab_alloc_node mm/slub.c:3995 [inline]
slab_alloc_node mm/slub.c:4156 [inline]
kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4175
gfs2_glock_get+0x309/0x1010 fs/gfs2/glock.c:1178
gfs2_inode_lookup+0x2a3/0xc90 fs/gfs2/inode.c:135
gfs2_lookup_root fs/gfs2/ops_fstype.c:440 [inline]
init_sb+0xa2a/0x1270 fs/gfs2/ops_fstype.c:507
gfs2_fill_super+0x19b3/0x24d0 fs/gfs2/ops_fstype.c:1218
get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x90/0x2b0 fs/super.c:1814
page last free pid 6026 tgid 6025 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0xd3f/0x1010 mm/page_alloc.c:2657
stack_depot_save_flags+0x7c6/0x940 lib/stackdepot.c:674
kasan_save_stack mm/kasan/common.c:48 [inline]
kasan_save_track+0x51/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4119 [inline]
slab_alloc_node mm/slub.c:4168 [inline]
kmem_cache_alloc_lru_noprof+0x1dd/0x390 mm/slub.c:4187
gfs2_alloc_inode+0x58/0x170 fs/gfs2/super.c:1555
alloc_inode+0x65/0x1a0 fs/inode.c:336
iget5_locked+0x4a/0xa0 fs/inode.c:1404
gfs2_inode_lookup+0xf3/0xc90 fs/gfs2/inode.c:124
gfs2_lookup_root fs/gfs2/ops_fstype.c:440 [inline]
init_sb+0xa2a/0x1270 fs/gfs2/ops_fstype.c:507
gfs2_fill_super+0x19b3/0x24d0 fs/gfs2/ops_fstype.c:1218
get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636
gfs2_get_tree+0x54/0x220 fs/gfs2/ops_fstype.c:1332
vfs_get_tree+0x90/0x2b0 fs/super.c:1814
do_new_mount+0x2be/0xb40 fs/namespace.c:3507
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034

Memory state around the buggy address:
ffff88804fd61280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804fd61300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88804fd61380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804fd61400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804fd61480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Tested on:

commit: 2d8308bf Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12116730580000
kernel config: https://syzkaller.appspot.com/x/.config?x=fee25f93665c89ac
dashboard link: https://syzkaller.appspot.com/bug?extid=4c7590f1cee06597e43a
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch: https://syzkaller.appspot.com/x/patch.diff?x=15fe6730580000