================================================================== 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:270 [inline] BUG: KASAN: slab-use-after-free in folio_evictable mm/internal.h:478 [inline] BUG: KASAN: slab-use-after-free in lru_add+0x25b/0xd60 mm/swap.c:136 Read of size 8 at addr ffff8880273f03c8 by task udevd/6233 CPU: 0 UID: 0 PID: 6233 Comm: udevd Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x185/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc2/0x2a0 mm/kasan/report.c:521 kasan_report+0x114/0x150 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2a4/0x2b0 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:270 [inline] folio_evictable mm/internal.h:478 [inline] lru_add+0x25b/0xd60 mm/swap.c:136 folio_batch_move_lru+0x217/0x3a0 mm/swap.c:168 lru_add_drain_cpu+0x115/0x880 mm/swap.c:642 lru_add_drain+0x11e/0x3e0 mm/swap.c:730 __folio_batch_release+0x44/0x90 mm/swap.c:1049 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x49a/0x14a0 mm/shmem.c:1125 shmem_truncate_range mm/shmem.c:1237 [inline] shmem_evict_inode+0x26f/0xa30 mm/shmem.c:1365 evict+0x4fd/0x9b0 fs/inode.c:810 __dentry_kill+0x209/0x660 fs/dcache.c:669 dput+0x19b/0x2b0 fs/dcache.c:911 do_renameat2+0x884/0xc50 fs/namei.c:5288 __do_sys_rename fs/namei.c:5333 [inline] __se_sys_rename fs/namei.c:5331 [inline] __x64_sys_rename+0x7e/0x90 fs/namei.c:5331 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x86/0x2e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f40dca7acc7 Code: e8 5e a7 09 00 f7 d8 19 c0 5b c3 0f 1f 84 00 00 00 00 00 b8 ff ff ff ff 5b c3 66 0f 1f 84 00 00 00 00 00 b8 52 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 01 61 17 00 f7 d8 64 89 02 b8 RSP: 002b:00007ffcdbaa0d28 EFLAGS: 00000206 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 000055c9359ca730 RCX: 00007f40dca7acc7 RDX: 000055c9359ca010 RSI: 00007ffcdbaa0d40 RDI: 00007ffcdbaa1140 RBP: 000055c9359ddaf0 R08: 00000000000001e0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 00007ffcdbaa0d40 R13: 00007ffcdbaa1140 R14: 0000000000000000 R15: 000055c9053fd9dd Allocated by task 6709: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3a/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x68/0x80 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+0x1b5/0x3a0 mm/slub.c:4204 gfs2_glock_get+0x25f/0xec0 fs/gfs2/glock.c:1183 gfs2_inode_lookup+0x211/0xb10 fs/gfs2/inode.c:135 gfs2_dir_search+0x164/0x220 fs/gfs2/dir.c:1667 gfs2_lookupi+0x3d5/0x5a0 fs/gfs2/inode.c:340 gfs2_jindex_hold fs/gfs2/ops_fstype.c:574 [inline] init_journal+0x546/0x2250 fs/gfs2/ops_fstype.c:716 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851 gfs2_fill_super+0x1935/0x20e0 fs/gfs2/ops_fstype.c:1253 get_tree_bdev_flags+0x407/0x4d0 fs/super.c:1681 gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1335 vfs_get_tree+0x8b/0x280 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+0x313/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x86/0x2e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e Freed by task 23: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3a/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x42/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x5e/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+0x187/0x3e0 mm/slub.c:4745 rcu_do_batch kernel/rcu/tree.c:2576 [inline] rcu_core+0xc98/0x16e0 kernel/rcu/tree.c:2832 handle_softirqs+0x282/0x850 kernel/softirq.c:579 run_ksoftirqd+0x97/0xf0 kernel/softirq.c:968 smpboot_thread_fn+0x53e/0xa40 kernel/smpboot.c:164 kthread+0x70d/0x890 kernel/kthread.c:464 ret_from_fork+0x3f4/0x750 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+0x3a/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xb9/0xd0 mm/kasan/generic.c:548 __call_rcu_common kernel/rcu/tree.c:3094 [inline] call_rcu+0x147/0x990 kernel/rcu/tree.c:3214 __gfs2_glock_free+0xb40/0xc80 fs/gfs2/glock.c:172 gfs2_glock_free+0x38/0xa0 fs/gfs2/glock.c:178 gfs2_glock_put_eventually fs/gfs2/super.c:1185 [inline] gfs2_evict_inode+0xae3/0x1000 fs/gfs2/super.c:1460 evict+0x4fd/0x9b0 fs/inode.c:810 gfs2_jindex_free+0x398/0x440 fs/gfs2/super.c:79 init_journal+0x8ed/0x2250 fs/gfs2/ops_fstype.c:833 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851 gfs2_fill_super+0x1935/0x20e0 fs/gfs2/ops_fstype.c:1253 get_tree_bdev_flags+0x407/0x4d0 fs/super.c:1681 gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1335 vfs_get_tree+0x8b/0x280 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+0x313/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x86/0x2e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:47 kasan_record_aux_stack+0xb9/0xd0 mm/kasan/generic.c:548 insert_work+0x3d/0x320 kernel/workqueue.c:2183 __queue_work+0xcf6/0xfc0 kernel/workqueue.c:2341 queue_delayed_work_on+0x17e/0x270 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+0xce0/0x1210 fs/gfs2/glock.c:839 glock_work_func+0x2a4/0x570 fs/gfs2/glock.c:1096 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xada/0x1780 kernel/workqueue.c:3321 worker_thread+0xa53/0xfc0 kernel/workqueue.c:3402 kthread+0x70d/0x890 kernel/kthread.c:464 ret_from_fork+0x3f4/0x750 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 ffff8880273f0000 which belongs to the cache gfs2_glock(aspace) of size 1224 The buggy address is located 968 bytes inside of freed 1224-byte region [ffff8880273f0000, ffff8880273f04c8) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x273f0 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 ffff88814051d640 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88814051d640 dead000000000122 0000000000000000 head: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea00009cfc01 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 6709, tgid 6708 (syz.0.24), ts 139259527785, free_ts 138236203800 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x230/0x280 mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x2b2b/0x2ce0 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x17d/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/0x390 mm/slub.c:2619 new_slab mm/slub.c:2673 [inline] ___slab_alloc+0xc48/0x14c0 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+0x273/0x3a0 mm/slub.c:4204 gfs2_glock_get+0x25f/0xec0 fs/gfs2/glock.c:1183 gfs2_inode_lookup+0x211/0xb10 fs/gfs2/inode.c:135 gfs2_dir_search+0x164/0x220 fs/gfs2/dir.c:1667 gfs2_lookupi+0x3d5/0x5a0 fs/gfs2/inode.c:340 gfs2_jindex_hold fs/gfs2/ops_fstype.c:574 [inline] init_journal+0x546/0x2250 fs/gfs2/ops_fstype.c:716 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:851 gfs2_fill_super+0x1935/0x20e0 fs/gfs2/ops_fstype.c:1253 get_tree_bdev_flags+0x407/0x4d0 fs/super.c:1681 gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1335 page last free pid 6233 tgid 6233 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc4f/0xe40 mm/page_alloc.c:2706 __slab_free+0x322/0x3f0 mm/slub.c:4554 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:329 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+0x1b5/0x3a0 mm/slub.c:4204 getname_flags+0xb4/0x540 fs/namei.c:146 getname include/linux/fs.h:2907 [inline] do_sys_openat2+0xb8/0x1b0 fs/open.c:1431 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x134/0x160 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x86/0x2e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e Memory state around the buggy address: ffff8880273f0280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880273f0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880273f0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880273f0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880273f0480: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ==================================================================