================================================================== 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:499 [inline] BUG: KASAN: slab-use-after-free in lru_add+0x25f/0xd60 mm/swap.c:136 Read of size 8 at addr ffff888142b22378 by task syz-executor/11021 CPU: 0 UID: 0 PID: 11021 Comm: syz-executor Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200 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:499 [inline] lru_add+0x25f/0xd60 mm/swap.c:136 folio_batch_move_lru+0x294/0x420 mm/swap.c:172 lru_add_drain_cpu+0xb8/0x7b0 mm/swap.c:648 lru_add_drain+0x122/0x3e0 mm/swap.c:737 __folio_batch_release+0x48/0x90 mm/swap.c:1059 folio_batch_release include/linux/pagevec.h:101 [inline] truncate_inode_pages_range+0x346/0xd90 mm/truncate.c:408 diUnmount+0xf7/0x130 fs/jfs/jfs_imap.c:190 jfs_umount+0x191/0x3c0 fs/jfs/jfs_umount.c:63 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194 generic_shutdown_super+0x135/0x2c0 fs/super.c:643 kill_block_super+0x44/0x90 fs/super.c:1722 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1312 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa0d5790a77 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fff92d3ad88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fa0d5813d7d RCX: 00007fa0d5790a77 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff92d3ae40 RBP: 00007fff92d3ae40 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff92d3bed0 R13: 00007fa0d5813d7d R14: 000000000007814d R15: 00007fff92d3bf10 Allocated by task 11568: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4969 [inline] slab_alloc_node mm/slub.c:5283 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5290 gfs2_glock_get+0x263/0xf10 fs/gfs2/glock.c:1096 gfs2_inode_lookup+0x270/0xbe0 fs/gfs2/inode.c:149 gfs2_dir_search+0x168/0x220 fs/gfs2/dir.c:1665 gfs2_lookupi+0x3d9/0x5a0 fs/gfs2/inode.c:354 gfs2_jindex_hold fs/gfs2/ops_fstype.c:573 [inline] init_journal+0x553/0x2170 fs/gfs2/ops_fstype.c:713 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:844 gfs2_fill_super+0x1a08/0x21b0 fs/gfs2/ops_fstype.c:1250 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1332 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3630 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3706 do_mount fs/namespace.c:4029 [inline] __do_sys_mount fs/namespace.c:4218 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4195 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 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:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2556 [inline] slab_free mm/slub.c:6690 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6801 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7bd/0x1060 kernel/rcu/tree.c:2869 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:626 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1067 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x389/0x480 kernel/kthread.c:467 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 gfs2_glock_free+0x3c/0xa0 fs/gfs2/glock.c:151 gfs2_glock_put_eventually fs/gfs2/super.c:1170 [inline] gfs2_evict_inode+0xae7/0x1000 fs/gfs2/super.c:1445 evict+0x5f4/0xae0 fs/inode.c:837 gfs2_jindex_free+0x39c/0x440 fs/gfs2/super.c:79 init_journal+0x865/0x2170 fs/gfs2/ops_fstype.c:826 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:844 gfs2_fill_super+0x1a08/0x21b0 fs/gfs2/ops_fstype.c:1250 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1332 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3630 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3706 do_mount fs/namespace.c:4029 [inline] __do_sys_mount fs/namespace.c:4218 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4195 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 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:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 insert_work+0x3d/0x330 kernel/workqueue.c:2199 __queue_work+0xcd0/0xf90 kernel/workqueue.c:2354 queue_delayed_work_on+0x11a/0x1d0 kernel/workqueue.c:2574 queue_delayed_work include/linux/workqueue.h:684 [inline] gfs2_glock_queue_work fs/gfs2/glock.c:222 [inline] do_xmote+0x514/0x750 fs/gfs2/glock.c:737 glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1009 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279 process_scheduled_works kernel/workqueue.c:3362 [inline] worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443 kthread+0x389/0x480 kernel/kthread.c:467 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 The buggy address belongs to the object at ffff888142b21fb0 which belongs to the cache gfs2_glock(aspace) of size 1224 The buggy address is located 968 bytes inside of freed 1224-byte region [ffff888142b21fb0, ffff888142b22478) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x142b20 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x57ff00000000040(head|node=1|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 057ff00000000040 ffff88801d36f500 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000 head: 057ff00000000040 ffff88801d36f500 dead000000000122 0000000000000000 head: 0000000000000000 00000000800c000c 00000000f5000000 0000000000000000 head: 057ff00000000002 ffffea00050ac801 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 8768, tgid 8767 (syz.7.571), ts 284881101446, free_ts 34521454080 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x23d/0x2a0 mm/page_alloc.c:1887 prep_new_page mm/page_alloc.c:1895 [inline] get_page_from_freelist+0x23a5/0x2440 mm/page_alloc.c:3948 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5257 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3091 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3264 new_slab mm/slub.c:3318 [inline] ___slab_alloc+0xdb6/0x17b0 mm/slub.c:4672 __slab_alloc+0x65/0x100 mm/slub.c:4795 __slab_alloc_node mm/slub.c:4871 [inline] slab_alloc_node mm/slub.c:5271 [inline] kmem_cache_alloc_noprof+0x40f/0x710 mm/slub.c:5290 gfs2_glock_get+0x263/0xf10 fs/gfs2/glock.c:1096 gfs2_inode_lookup+0x270/0xbe0 fs/gfs2/inode.c:149 gfs2_lookup_root fs/gfs2/ops_fstype.c:426 [inline] init_sb+0xa30/0x12c0 fs/gfs2/ops_fstype.c:495 gfs2_fill_super+0x16a6/0x21b0 fs/gfs2/ops_fstype.c:1217 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1332 vfs_get_tree+0x92/0x2a0 fs/super.c:1751 fc_mount fs/namespace.c:1193 [inline] do_new_mount_fc fs/namespace.c:3630 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3706 page last free pid 5195 tgid 5195 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1436 [inline] __free_frozen_pages+0xb99/0xd10 mm/page_alloc.c:2976 __slab_free+0x2ce/0x320 mm/slub.c:6024 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4969 [inline] slab_alloc_node mm/slub.c:5283 [inline] __do_kmalloc_node mm/slub.c:5676 [inline] __kmalloc_noprof+0x3cf/0x800 mm/slub.c:5689 kmalloc_noprof include/linux/slab.h:962 [inline] kernfs_fop_write_iter+0x158/0x540 fs/kernfs/file.c:329 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888142b22200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888142b22280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888142b22300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888142b22380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888142b22400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ==================================================================