================================================================== BUG: KASAN: use-after-free in __up_write kernel/locking/rwsem.c:1366 [inline] BUG: KASAN: use-after-free in up_write+0x67/0x410 kernel/locking/rwsem.c:1626 Read of size 8 at addr ffff888055789570 by task gfs2_quotad/4866 CPU: 0 PID: 4866 Comm: gfs2_quotad Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 __up_write kernel/locking/rwsem.c:1366 [inline] up_write+0x67/0x410 kernel/locking/rwsem.c:1626 inode_unlock include/linux/fs.h:763 [inline] do_sync+0x8c0/0xbb0 fs/gfs2/quota.c:984 gfs2_quota_sync+0x355/0x780 fs/gfs2/quota.c:1329 quotad_check_timeo fs/gfs2/quota.c:1519 [inline] gfs2_quotad+0x421/0x690 fs/gfs2/quota.c:1566 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 4847: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x490 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc_lru+0x182/0x2e0 mm/slub.c:3390 alloc_inode_sb include/linux/fs.h:3245 [inline] gfs2_alloc_inode+0x50/0x120 fs/gfs2/super.c:1545 alloc_inode fs/inode.c:261 [inline] iget5_locked+0x9e/0x260 fs/inode.c:1328 gfs2_inode_lookup+0xf2/0xd10 fs/gfs2/inode.c:124 gfs2_dir_search+0x165/0x220 fs/gfs2/dir.c:1665 gfs2_lookupi+0x46b/0x660 fs/gfs2/inode.c:323 gfs2_lookup_simple+0xab/0x100 fs/gfs2/inode.c:264 init_inodes+0x180/0x320 fs/gfs2/ops_fstype.c:904 gfs2_fill_super+0x17bf/0x2020 fs/gfs2/ops_fstype.c:1246 get_tree_bdev+0x3e6/0x610 fs/super.c:1366 gfs2_get_tree+0x4d/0x1e0 fs/gfs2/ops_fstype.c:1327 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 21: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] kmem_cache_free+0xf7/0x2a0 mm/slub.c:3709 rcu_do_batch kernel/rcu/tree.c:2297 [inline] rcu_core+0x9a3/0x1740 kernel/rcu/tree.c:2557 handle_softirqs+0x291/0x910 kernel/softirq.c:596 run_ksoftirqd+0xa4/0x100 kernel/softirq.c:968 smpboot_thread_fn+0x667/0xa30 kernel/smpboot.c:164 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 call_rcu+0x14f/0x950 kernel/rcu/tree.c:2849 destroy_inode fs/inode.c:316 [inline] evict+0x810/0x8b0 fs/inode.c:720 gfs2_put_super+0x429/0x920 fs/gfs2/super.c:620 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7c/0xe0 fs/super.c:1470 deactivate_locked_super+0x93/0xf0 fs/super.c:332 cleanup_mnt+0x471/0x4f0 fs/namespace.c:1191 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888055789428 which belongs to the cache gfs2_inode of size 1592 The buggy address is located 328 bytes inside of 1592-byte region [ffff888055789428, ffff888055789a60) The buggy address belongs to the physical page: page:ffffea000155e200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55788 head:ffffea000155e200 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888028c53101 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff8881413363c0 raw: 0000000000000000 0000000080130013 00000001ffffffff ffff888028c53101 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 4847, tgid 4846 (syz.0.121), ts 133151767690, free_ts 12692713220 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc_lru+0x104/0x2e0 mm/slub.c:3390 alloc_inode_sb include/linux/fs.h:3245 [inline] gfs2_alloc_inode+0x50/0x120 fs/gfs2/super.c:1545 alloc_inode fs/inode.c:261 [inline] iget5_locked+0x9e/0x260 fs/inode.c:1328 gfs2_inode_lookup+0xf2/0xd10 fs/gfs2/inode.c:124 gfs2_dir_search+0x165/0x220 fs/gfs2/dir.c:1665 gfs2_lookupi+0x46b/0x660 fs/gfs2/inode.c:323 gfs2_lookup_simple+0xab/0x100 fs/gfs2/inode.c:264 init_statfs fs/gfs2/ops_fstype.c:661 [inline] init_journal+0x1207/0x23a0 fs/gfs2/ops_fstype.c:820 init_inodes+0xdb/0x320 fs/gfs2/ops_fstype.c:889 gfs2_fill_super+0x17bf/0x2020 fs/gfs2/ops_fstype.c:1246 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1487 [inline] free_pcp_prepare mm/page_alloc.c:1537 [inline] free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509 free_contig_range+0x9d/0x150 mm/page_alloc.c:9626 destroy_args+0xef/0xa0e mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x33c/0x38e mm/debug_vm_pgtable.c:1359 do_one_initcall+0x257/0x800 init/main.c:1309 do_initcall_level+0x13d/0x1ed init/main.c:1382 do_initcalls+0x4b/0x8a init/main.c:1398 kernel_init_freeable+0x401/0x5ab init/main.c:1637 kernel_init+0x19/0x1b0 init/main.c:1525 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888055789400: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb ffff888055789480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888055789500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888055789580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888055789600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================