================================================================== 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+0xe4/0x250 mm/internal.h:499 Read of size 8 at addr ffff888059b36378 by task syz.9.2449/17292 CPU: 0 UID: 0 PID: 17292 Comm: syz.9.2449 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+0x189/0x250 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:269 [inline] folio_evictable+0xe4/0x250 mm/internal.h:499 sort_folio mm/vmscan.c:4445 [inline] scan_folios mm/vmscan.c:4573 [inline] isolate_folios mm/vmscan.c:4669 [inline] evict_folios+0x1af9/0x57f0 mm/vmscan.c:4699 try_to_shrink_lruvec+0x8a3/0xb50 mm/vmscan.c:4874 lru_gen_shrink_lruvec mm/vmscan.c:5023 [inline] shrink_lruvec+0x49c/0x2980 mm/vmscan.c:5784 shrink_node_memcgs mm/vmscan.c:6020 [inline] shrink_node+0xaa9/0x35b0 mm/vmscan.c:6061 shrink_zones mm/vmscan.c:6300 [inline] do_try_to_free_pages+0x668/0x1960 mm/vmscan.c:6362 try_to_free_mem_cgroup_pages+0x2ea/0x7a0 mm/vmscan.c:6690 try_charge_memcg+0xa2d/0x1280 mm/memcontrol.c:2388 try_charge mm/memcontrol.c:2530 [inline] charge_memcg+0x9f/0x180 mm/memcontrol.c:4728 __mem_cgroup_charge+0x25/0x80 mm/memcontrol.c:4745 mem_cgroup_charge include/linux/memcontrol.h:663 [inline] shmem_alloc_and_add_folio+0x790/0xf40 mm/shmem.c:1954 shmem_get_folio_gfp+0x59d/0x1660 mm/shmem.c:2568 shmem_get_folio mm/shmem.c:2674 [inline] shmem_write_begin+0x16c/0x330 mm/shmem.c:3327 generic_perform_write+0x2c5/0x900 mm/filemap.c:4314 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3502 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+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f417938e1ff 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:00007f417a2aadf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000040000 RCX: 00007f417938e1ff RDX: 0000000000040000 RSI: 00007f416f000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000447 R10: 00000000000003ba R11: 0000000000000293 R12: 0000000000000003 R13: 00007f417a2aaef0 R14: 00007f417a2aaeb0 R15: 00007f416f000000 Allocated by task 13838: 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:4953 [inline] slab_alloc_node mm/slub.c:5267 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5274 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:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 2964: 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:2540 [inline] slab_free mm/slub.c:6674 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6785 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xd70/0x1870 kernel/rcu/tree.c:2857 handle_softirqs+0x27d/0x850 kernel/softirq.c:626 do_softirq+0xec/0x180 kernel/softirq.c:523 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:450 spin_unlock_bh include/linux/spinlock.h:396 [inline] cfg80211_inform_single_bss_data+0x12a7/0x1ad0 net/wireless/scan.c:2389 cfg80211_inform_bss_data+0x203/0x3b40 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x749/0x9e0 net/mac80211/scan.c:230 ieee80211_rx_bss_info net/mac80211/ibss.c:1094 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1575 [inline] ieee80211_ibss_rx_queued_mgmt+0xa5d/0x2af0 net/mac80211/ibss.c:1602 ieee80211_iface_process_skb net/mac80211/iface.c:1736 [inline] ieee80211_iface_work+0x85f/0x12d0 net/mac80211/iface.c:1790 cfg80211_wiphy_work+0x2ab/0x450 net/wireless/core.c:438 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+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 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:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 __gfs2_glock_free+0xb44/0xc90 fs/gfs2/glock.c:145 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:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3712 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/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+0x18b/0x280 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+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 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 ffff888059b35fb0 which belongs to the cache gfs2_glock(aspace) of size 1224 The buggy address is located 968 bytes inside of freed 1224-byte region [ffff888059b35fb0, ffff888059b36478) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888059b36f88 pfn:0x59b34 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 ffff888141a9f140 dead000000000122 0000000000000000 raw: ffff888059b36f88 00000000800c000b 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff888141a9f140 dead000000000122 0000000000000000 head: ffff888059b36f88 00000000800c000b 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea000166cd01 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 7155, tgid 7154 (syz.1.253), ts 175226172173, free_ts 86247989670 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1857 prep_new_page mm/page_alloc.c:1865 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xf2b/0x1960 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5255 [inline] kmem_cache_alloc_noprof+0x40f/0x710 mm/slub.c:5274 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_lookup_meta+0xa7/0x170 fs/gfs2/inode.c:294 init_inodes+0x120/0x320 fs/gfs2/ops_fstype.c:850 gfs2_fill_super+0x1a08/0x21b0 fs/gfs2/ops_fstype.c:1250 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 page last free pid 5845 tgid 5845 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1406 [inline] __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943 __slab_free+0x21b/0x2a0 mm/slub.c:6008 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:4953 [inline] slab_alloc_node mm/slub.c:5267 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5274 mt_alloc_one lib/maple_tree.c:174 [inline] mas_alloc_nodes+0x291/0x350 lib/maple_tree.c:1110 mas_preallocate+0x2e0/0x670 lib/maple_tree.c:5194 vma_iter_prealloc mm/vma.h:502 [inline] commit_merge+0x1fd/0x700 mm/vma.c:746 vma_merge_existing_range mm/vma.c:969 [inline] vma_modify+0x1248/0x1a70 mm/vma.c:1611 vma_modify_flags+0x208/0x2e0 mm/vma.c:1654 mprotect_fixup+0x43c/0xa30 mm/mprotect.c:756 do_mprotect_pkey+0x8c5/0xcd0 mm/mprotect.c:930 __do_sys_mprotect mm/mprotect.c:951 [inline] __se_sys_mprotect mm/mprotect.c:948 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:948 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888059b36200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888059b36280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888059b36300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888059b36380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888059b36400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ==================================================================