================================================================== 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 ffff88805a3f8910 by task syz.1.1711/11132 CPU: 0 UID: 0 PID: 11132 Comm: syz.1.1711 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 obj_cgroup_charge_pages mm/memcontrol.c:2823 [inline] __memcg_kmem_charge_page+0xe1/0x240 mm/memcontrol.c:2867 __alloc_frozen_pages_noprof+0x1b5/0x370 mm/page_alloc.c:5227 __alloc_pages_noprof mm/page_alloc.c:5244 [inline] alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5164 alloc_pages_bulk_mempolicy_noprof+0x341/0x1650 mm/mempolicy.c:2794 vm_area_alloc_pages mm/vmalloc.c:3731 [inline] __vmalloc_area_node mm/vmalloc.c:3901 [inline] __vmalloc_node_range_noprof+0xa38/0x16a0 mm/vmalloc.c:4089 __kvmalloc_node_noprof+0x670/0x920 mm/slub.c:7168 hash_netiface_create+0x358/0x1040 net/netfilter/ipset/ip_set_hash_gen.h:1568 ip_set_create+0xa9a/0x19c0 net/netfilter/ipset/ip_set_core.c:1109 nfnetlink_rcv_msg+0xb4d/0x1130 net/netfilter/nfnetlink.c:302 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 nfnetlink_rcv+0x282/0x2590 net/netfilter/nfnetlink.c:669 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:737 __sock_sendmsg net/socket.c:752 [inline] ____sys_sendmsg+0x577/0x880 net/socket.c:2610 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2664 __sys_sendmsg net/socket.c:2696 [inline] __do_sys_sendmsg net/socket.c:2701 [inline] __se_sys_sendmsg net/socket.c:2699 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2699 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: 0033:0x7f443198f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4432914038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f4431be5fa0 RCX: 00007f443198f749 RDX: 0000000000000800 RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007f4431a13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4431be6038 R14: 00007f4431be5fa0 R15: 00007fff2acd92c8 Allocated by task 7442: 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_lookup_root fs/gfs2/ops_fstype.c:426 [inline] init_sb+0xae3/0x12c0 fs/gfs2/ops_fstype.c:501 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: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 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: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 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 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 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 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 ffff88805a3f8548 which belongs to the cache gfs2_glock(aspace) of size 1224 The buggy address is located 968 bytes inside of freed 1224-byte region [ffff88805a3f8548, ffff88805a3f8a10) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805a3f9fb0 pfn:0x5a3f8 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 ffff888143ed1000 dead000000000122 0000000000000000 raw: ffff88805a3f9fb0 00000000800c0005 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff888143ed1000 dead000000000122 0000000000000000 head: ffff88805a3f9fb0 00000000800c0005 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea000168fe01 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 7150, tgid 7149 (syz.1.327), ts 164567292010, free_ts 163984404549 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_journal+0x1a5/0x2170 fs/gfs2/ops_fstype.c:705 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:844 gfs2_fill_super+0x1a08/0x21b0 fs/gfs2/ops_fstype.c:1250 page last free pid 7142 tgid 7142 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 stack_depot_save_flags+0x43d/0x850 lib/stackdepot.c:727 kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5661 [inline] __kmalloc_node_noprof+0x57a/0x820 mm/slub.c:5667 kmalloc_array_node_noprof include/linux/slab.h:1075 [inline] alloc_slab_obj_exts+0x3e/0x100 mm/slub.c:2123 account_slab mm/slub.c:3202 [inline] allocate_slab+0x1cc/0x3b0 mm/slub.c:3267 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 seq_open fs/seq_file.c:64 [inline] single_open+0x119/0x240 fs/seq_file.c:584 proc_reg_open+0x247/0x540 fs/proc/inode.c:511 do_dentry_open+0x785/0x14e0 fs/open.c:962 vfs_open+0x3b/0x340 fs/open.c:1094 do_open fs/namei.c:4627 [inline] path_openat+0x2de0/0x3840 fs/namei.c:4786 do_filp_open+0x1fa/0x410 fs/namei.c:4813 Memory state around the buggy address: ffff88805a3f8800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a3f8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805a3f8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805a3f8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805a3f8a00: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================