================================================================== 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: 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 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 ==================================================================