[moderation] [mm?] KASAN: slab-use-after-free Read in move_to_new_folio (4)
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syzbot
Jul 7, 2025, 12:16:30 AM7/7/25
to syzkaller-upst...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 4c06e63b9203 Merge tag 'for-6.16-rc4-tag' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14588f70580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b29b1a0d7330d4a8
dashboard link: https://syzkaller.appspot.com/bug?extid=29b952b1509ef45227a0
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
CC: [ak...@linux-foundation.org apo...@nvidia.com byun...@sk.com da...@redhat.com gou...@gourry.net joshua...@gmail.com linux-...@vger.kernel.org linu...@kvack.org matthe...@intel.com raki...@sk.com ying....@linux.alibaba.com z...@nvidia.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/312dbd12f65e/disk-4c06e63b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5467709a60c6/vmlinux-4c06e63b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7eb09d10d93/bzImage-4c06e63b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+29b952...@syzkaller.appspotmail.com
==================================================================
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_inaccessible include/linux/pagemap.h:336 [inline]
BUG: KASAN: slab-use-after-free in move_to_new_folio+0x182/0x7a0 mm/migrate.c:983
Read of size 8 at addr ffff8880505193a0 by task kcompactd0/34
CPU: 1 UID: 0 PID: 34 Comm: kcompactd0 Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xd2/0x2b0 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x2b0/0x2c0 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_inaccessible include/linux/pagemap.h:336 [inline]
move_to_new_folio+0x182/0x7a0 mm/migrate.c:983
migrate_folio_move mm/migrate.c:1301 [inline]
migrate_folios_move mm/migrate.c:1653 [inline]
migrate_pages_batch+0x1c34/0x2830 mm/migrate.c:1900
migrate_pages_sync mm/migrate.c:1930 [inline]
migrate_pages+0x1bcc/0x2930 mm/migrate.c:2039
compact_zone+0x23f4/0x4ad0 mm/compaction.c:2683
compact_node+0x1d2/0x280 mm/compaction.c:2952
kcompactd+0xbc8/0x1290 mm/compaction.c:3250
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 10424:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204
gfs2_glock_get+0x263/0xec0 fs/gfs2/glock.c:1183
gfs2_inode_lookup+0x215/0xb10 fs/gfs2/inode.c:135
gfs2_dir_search+0x168/0x220 fs/gfs2/dir.c:1667
gfs2_lookupi+0x3d9/0x5a0 fs/gfs2/inode.c:340
gfs2_jindex_hold fs/gfs2/ops_fstype.c:574 [inline]
init_journal+0x54a/0x2260 fs/gfs2/ops_fstype.c:716
init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851
gfs2_fill_super+0x1939/0x20e0 fs/gfs2/ops_fstype.c:1253
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1335
vfs_get_tree+0x92/0x2b0 fs/super.c:1804
do_new_mount+0x24a/0xa40 fs/namespace.c:3902
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4427
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 23:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kmem_cache_free+0x18f/0x400 mm/slub.c:4745
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0xca8/0x1710 kernel/rcu/tree.c:2832
handle_softirqs+0x286/0x870 kernel/softirq.c:579
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:164
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
__call_rcu_common kernel/rcu/tree.c:3094 [inline]
call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3214
__gfs2_glock_free+0xb44/0xc90 fs/gfs2/glock.c:172
gfs2_glock_free+0x3c/0xa0 fs/gfs2/glock.c:178
gfs2_glock_put_eventually fs/gfs2/super.c:1185 [inline]
gfs2_evict_inode+0xae7/0x1000 fs/gfs2/super.c:1460
evict+0x504/0x9c0 fs/inode.c:810
gfs2_jindex_free+0x39c/0x440 fs/gfs2/super.c:79
init_journal+0x8f1/0x2260 fs/gfs2/ops_fstype.c:833
init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851
gfs2_fill_super+0x1939/0x20e0 fs/gfs2/ops_fstype.c:1253
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1335
vfs_get_tree+0x92/0x2b0 fs/super.c:1804
do_new_mount+0x24a/0xa40 fs/namespace.c:3902
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4427
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
insert_work+0x3d/0x330 kernel/workqueue.c:2183
__queue_work+0xcfc/0xfe0 kernel/workqueue.c:2341
queue_delayed_work_on+0x18b/0x280 kernel/workqueue.c:2561
queue_delayed_work include/linux/workqueue.h:677 [inline]
gfs2_glock_queue_work fs/gfs2/glock.c:250 [inline]
do_xmote+0xce0/0x1220 fs/gfs2/glock.c:839
glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1096
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff888050518fd8
which belongs to the cache gfs2_glock(aspace) of size 1224
The buggy address is located 968 bytes inside of
freed 1224-byte region [ffff888050518fd8, ffff8880505194a0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805051aa40 pfn:0x50518
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801e3e4780 dead000000000122 0000000000000000
raw: ffff88805051aa40 00000000800c0005 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801e3e4780 dead000000000122 0000000000000000
head: ffff88805051aa40 00000000800c0005 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001414601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
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 10424, tgid 10423 (syz.5.1649), ts 267975249084, free_ts 267711457961
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2619
new_slab mm/slub.c:2673 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3859
__slab_alloc mm/slub.c:3949 [inline]
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4204
gfs2_glock_get+0x263/0xec0 fs/gfs2/glock.c:1183
gfs2_inode_lookup+0x215/0xb10 fs/gfs2/inode.c:135
gfs2_lookup_root fs/gfs2/ops_fstype.c:425 [inline]
init_sb+0xa30/0x12c0 fs/gfs2/ops_fstype.c:494
gfs2_fill_super+0x1605/0x20e0 fs/gfs2/ops_fstype.c:1220
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1335
vfs_get_tree+0x92/0x2b0 fs/super.c:1804
do_new_mount+0x24a/0xa40 fs/namespace.c:3902
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4427
page last free pid 10454 tgid 10454 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706
__folio_put+0x21b/0x2c0 mm/swap.c:112
folio_put include/linux/mm.h:1356 [inline]
free_large_kmalloc+0x145/0x200 mm/slub.c:4768
vhost_vq_free_iovecs drivers/vhost/vhost.c:454 [inline]
vhost_dev_free_iovecs drivers/vhost/vhost.c:491 [inline]
vhost_dev_cleanup+0x5a6/0xb10 drivers/vhost/vhost.c:1040
vhost_vsock_dev_release+0x377/0x3f0 drivers/vhost/vsock.c:754
__fput+0x44c/0xa70 fs/file_table.c:465
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888050519280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888050519300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888050519380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888050519400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888050519480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want to overwrite report's subsystems, reply with:
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(See the list of subsystem names on the web dashboard)
If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: 4c06e63b9203 Merge tag 'for-6.16-rc4-tag' of git://git.ker..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14588f70580000
kernel config: https://syzkaller.appspot.com/x/.config?x=b29b1a0d7330d4a8
dashboard link: https://syzkaller.appspot.com/bug?extid=29b952b1509ef45227a0
compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
CC: [ak...@linux-foundation.org apo...@nvidia.com byun...@sk.com da...@redhat.com gou...@gourry.net joshua...@gmail.com linux-...@vger.kernel.org linu...@kvack.org matthe...@intel.com raki...@sk.com ying....@linux.alibaba.com z...@nvidia.com]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/312dbd12f65e/disk-4c06e63b.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/5467709a60c6/vmlinux-4c06e63b.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a7eb09d10d93/bzImage-4c06e63b.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+29b952...@syzkaller.appspotmail.com
==================================================================
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_inaccessible include/linux/pagemap.h:336 [inline]
BUG: KASAN: slab-use-after-free in move_to_new_folio+0x182/0x7a0 mm/migrate.c:983
Read of size 8 at addr ffff8880505193a0 by task kcompactd0/34
CPU: 1 UID: 0 PID: 34 Comm: kcompactd0 Not tainted 6.16.0-rc4-syzkaller-00123-g4c06e63b9203 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
<TASK>
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xd2/0x2b0 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x2b0/0x2c0 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_inaccessible include/linux/pagemap.h:336 [inline]
move_to_new_folio+0x182/0x7a0 mm/migrate.c:983
migrate_folio_move mm/migrate.c:1301 [inline]
migrate_folios_move mm/migrate.c:1653 [inline]
migrate_pages_batch+0x1c34/0x2830 mm/migrate.c:1900
migrate_pages_sync mm/migrate.c:1930 [inline]
migrate_pages+0x1bcc/0x2930 mm/migrate.c:2039
compact_zone+0x23f4/0x4ad0 mm/compaction.c:2683
compact_node+0x1d2/0x280 mm/compaction.c:2952
kcompactd+0xbc8/0x1290 mm/compaction.c:3250
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 10424:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:319 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4148 [inline]
slab_alloc_node mm/slub.c:4197 [inline]
kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4204
gfs2_glock_get+0x263/0xec0 fs/gfs2/glock.c:1183
gfs2_inode_lookup+0x215/0xb10 fs/gfs2/inode.c:135
gfs2_dir_search+0x168/0x220 fs/gfs2/dir.c:1667
gfs2_lookupi+0x3d9/0x5a0 fs/gfs2/inode.c:340
gfs2_jindex_hold fs/gfs2/ops_fstype.c:574 [inline]
init_journal+0x54a/0x2260 fs/gfs2/ops_fstype.c:716
init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851
gfs2_fill_super+0x1939/0x20e0 fs/gfs2/ops_fstype.c:1253
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1335
vfs_get_tree+0x92/0x2b0 fs/super.c:1804
do_new_mount+0x24a/0xa40 fs/namespace.c:3902
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4427
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 23:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2381 [inline]
slab_free mm/slub.c:4643 [inline]
kmem_cache_free+0x18f/0x400 mm/slub.c:4745
rcu_do_batch kernel/rcu/tree.c:2576 [inline]
rcu_core+0xca8/0x1710 kernel/rcu/tree.c:2832
handle_softirqs+0x286/0x870 kernel/softirq.c:579
run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968
smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:164
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
__call_rcu_common kernel/rcu/tree.c:3094 [inline]
call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3214
__gfs2_glock_free+0xb44/0xc90 fs/gfs2/glock.c:172
gfs2_glock_free+0x3c/0xa0 fs/gfs2/glock.c:178
gfs2_glock_put_eventually fs/gfs2/super.c:1185 [inline]
gfs2_evict_inode+0xae7/0x1000 fs/gfs2/super.c:1460
evict+0x504/0x9c0 fs/inode.c:810
gfs2_jindex_free+0x39c/0x440 fs/gfs2/super.c:79
init_journal+0x8f1/0x2260 fs/gfs2/ops_fstype.c:833
init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851
gfs2_fill_super+0x1939/0x20e0 fs/gfs2/ops_fstype.c:1253
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1335
vfs_get_tree+0x92/0x2b0 fs/super.c:1804
do_new_mount+0x24a/0xa40 fs/namespace.c:3902
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4427
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Second to last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
insert_work+0x3d/0x330 kernel/workqueue.c:2183
__queue_work+0xcfc/0xfe0 kernel/workqueue.c:2341
queue_delayed_work_on+0x18b/0x280 kernel/workqueue.c:2561
queue_delayed_work include/linux/workqueue.h:677 [inline]
gfs2_glock_queue_work fs/gfs2/glock.c:250 [inline]
do_xmote+0xce0/0x1220 fs/gfs2/glock.c:839
glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1096
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff888050518fd8
which belongs to the cache gfs2_glock(aspace) of size 1224
The buggy address is located 968 bytes inside of
freed 1224-byte region [ffff888050518fd8, ffff8880505194a0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805051aa40 pfn:0x50518
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801e3e4780 dead000000000122 0000000000000000
raw: ffff88805051aa40 00000000800c0005 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801e3e4780 dead000000000122 0000000000000000
head: ffff88805051aa40 00000000800c0005 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0001414601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
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 10424, tgid 10423 (syz.5.1649), ts 267975249084, free_ts 267711457961
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704
prep_new_page mm/page_alloc.c:1712 [inline]
get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419
alloc_slab_page mm/slub.c:2451 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2619
new_slab mm/slub.c:2673 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3859
__slab_alloc mm/slub.c:3949 [inline]
__slab_alloc_node mm/slub.c:4024 [inline]
slab_alloc_node mm/slub.c:4185 [inline]
kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4204
gfs2_glock_get+0x263/0xec0 fs/gfs2/glock.c:1183
gfs2_inode_lookup+0x215/0xb10 fs/gfs2/inode.c:135
gfs2_lookup_root fs/gfs2/ops_fstype.c:425 [inline]
init_sb+0xa30/0x12c0 fs/gfs2/ops_fstype.c:494
gfs2_fill_super+0x1605/0x20e0 fs/gfs2/ops_fstype.c:1220
get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1681
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1335
vfs_get_tree+0x92/0x2b0 fs/super.c:1804
do_new_mount+0x24a/0xa40 fs/namespace.c:3902
do_mount fs/namespace.c:4239 [inline]
__do_sys_mount fs/namespace.c:4450 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4427
page last free pid 10454 tgid 10454 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1248 [inline]
__free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706
__folio_put+0x21b/0x2c0 mm/swap.c:112
folio_put include/linux/mm.h:1356 [inline]
free_large_kmalloc+0x145/0x200 mm/slub.c:4768
vhost_vq_free_iovecs drivers/vhost/vhost.c:454 [inline]
vhost_dev_free_iovecs drivers/vhost/vhost.c:491 [inline]
vhost_dev_cleanup+0x5a6/0xb10 drivers/vhost/vhost.c:1040
vhost_vsock_dev_release+0x377/0x3f0 drivers/vhost/vsock.c:754
__fput+0x44c/0xa70 fs/file_table.c:465
task_work_run+0x1d4/0x260 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:114
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888050519280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888050519300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888050519380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888050519400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888050519480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
---
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Aleksandr Nogikh
Jul 7, 2025, 5:27:11 AM7/7/25
to syzbot, syzkaller-upst...@googlegroups.com
#syz set subsystems: gfs2
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syzbot
Jul 8, 2025, 7:20:13 AM7/8/25
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Sending this report to the next reporting stage.
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