================================================================== 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+0xe4/0x250 mm/internal.h:566 Read of size 8 at addr ffff88807af92378 by task syz.0.1293/8984 CPU: 0 UID: 0 PID: 8984 Comm: syz.0.1293 Not tainted syzkaller #0 PREEMPT(full) 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+0xe4/0x250 mm/internal.h:566 sort_folio mm/vmscan.c:4482 [inline] scan_folios mm/vmscan.c:4610 [inline] isolate_folios mm/vmscan.c:4706 [inline] evict_folios+0x1af9/0x57f0 mm/vmscan.c:4736 try_to_shrink_lruvec+0x8be/0xb60 mm/vmscan.c:4911 lru_gen_shrink_lruvec mm/vmscan.c:5060 [inline] shrink_lruvec+0x4a3/0x2a40 mm/vmscan.c:5814 shrink_node_memcgs mm/vmscan.c:6050 [inline] shrink_node+0xa19/0x39c0 mm/vmscan.c:6091 shrink_zones mm/vmscan.c:6330 [inline] do_try_to_free_pages+0x668/0x18a0 mm/vmscan.c:6392 try_to_free_mem_cgroup_pages+0x2b6/0x730 mm/vmscan.c:6713 try_charge_memcg+0xa2d/0x1280 mm/memcontrol.c:2414 obj_cgroup_charge_pages mm/memcontrol.c:2849 [inline] __memcg_kmem_charge_page+0xe1/0x240 mm/memcontrol.c:2893 __alloc_frozen_pages_noprof+0x1b5/0x370 mm/page_alloc.c:5253 __alloc_pages_noprof mm/page_alloc.c:5270 [inline] alloc_pages_bulk_noprof+0x560/0x710 mm/page_alloc.c:5190 alloc_pages_bulk_node_noprof include/linux/gfp.h:255 [inline] vm_area_alloc_pages mm/vmalloc.c:3702 [inline] __vmalloc_area_node mm/vmalloc.c:3868 [inline] __vmalloc_node_range_noprof+0xa15/0x16a0 mm/vmalloc.c:4056 __bpf_map_area_alloc kernel/bpf/syscall.c:404 [inline] bpf_map_area_alloc+0x12d/0x180 kernel/bpf/syscall.c:411 bloom_map_alloc+0x22f/0x470 kernel/bpf/bloom_filter.c:146 map_create+0xafd/0x16a0 kernel/bpf/syscall.c:1512 __sys_bpf+0x682/0x8a0 kernel/bpf/syscall.c:6188 __do_sys_bpf kernel/bpf/syscall.c:6319 [inline] __se_sys_bpf kernel/bpf/syscall.c:6317 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6317 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 RIP: 0033:0x7f122e58f749 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:00007f122f47f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f122e7e5fa0 RCX: 00007f122e58f749 RDX: 0000000000000050 RSI: 0000200000000300 RDI: 0000000000000000 RBP: 00007f122e613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f122e7e6038 R14: 00007f122e7e5fa0 R15: 00007ffea30f7d08 Allocated by task 7364: 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:1097 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:1204 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x31a/0xcf0 fs/namespace.c:3839 do_mount fs/namespace.c:4162 [inline] __do_sys_mount fs/namespace.c:4351 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4328 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 6021: 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 do_softirq+0x76/0xd0 kernel/softirq.c:523 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450 local_bh_enable include/linux/bottom_half.h:33 [inline] srcu_invoke_callbacks+0x21b/0x450 kernel/rcu/srcutree.c:1940 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 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:1204 [inline] do_new_mount_fc fs/namespace.c:3763 [inline] do_new_mount+0x31a/0xcf0 fs/namespace.c:3839 do_mount fs/namespace.c:4162 [inline] __do_sys_mount fs/namespace.c:4351 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4328 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:223 [inline] do_xmote+0x514/0x750 fs/gfs2/glock.c:738 glock_work_func+0x2a8/0x580 fs/gfs2/glock.c:1010 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 ffff88807af91fb0 which belongs to the cache gfs2_glock(aspace) of size 1224 The buggy address is located 968 bytes inside of freed 1224-byte region [ffff88807af91fb0, ffff88807af92478) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88807af92a40 pfn:0x7af90 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 ffff88801c35ea00 dead000000000122 0000000000000000 raw: ffff88807af92a40 00000000800c000a 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801c35ea00 dead000000000122 0000000000000000 head: ffff88807af92a40 00000000800c000a 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0001ebe401 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 7261, tgid 7260 (syz.2.596), ts 149965561047, free_ts 141332679830 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:5236 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:1097 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_statfs fs/gfs2/ops_fstype.c:623 [inline] init_journal+0x109a/0x2170 fs/gfs2/ops_fstype.c:779 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 5198 tgid 5198 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] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5290 locks_alloc_lock fs/locks.c:285 [inline] flock_lock_inode+0x232/0x12f0 fs/locks.c:1150 flock_lock_inode_wait fs/locks.c:2147 [inline] locks_lock_inode_wait+0x107/0x410 fs/locks.c:2174 locks_lock_file_wait include/linux/filelock.h:454 [inline] __do_sys_flock fs/locks.c:2242 [inline] __se_sys_flock+0x467/0x5b0 fs/locks.c:2198 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: ffff88807af92200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807af92280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807af92300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807af92380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807af92400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc ==================================================================