================================================================== BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:373 [inline] BUG: KASAN: slab-use-after-free in gfs2_discard fs/gfs2/aops.c:622 [inline] BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x42f/0xa30 fs/gfs2/aops.c:660 Read of size 8 at addr ffff88801d7231d8 by task syz-executor/5768 CPU: 1 PID: 5768 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 list_empty include/linux/list.h:373 [inline] gfs2_discard fs/gfs2/aops.c:622 [inline] gfs2_invalidate_folio+0x42f/0xa30 fs/gfs2/aops.c:660 folio_invalidate mm/truncate.c:158 [inline] truncate_cleanup_folio+0x21f/0x5e0 mm/truncate.c:178 truncate_inode_pages_range+0x275/0xea0 mm/truncate.c:392 gfs2_evict_inode+0x42e/0x13c0 fs/gfs2/super.c:1536 evict+0x4b7/0x8a0 fs/inode.c:705 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1770 [inline] gfs2_kill_sb+0x1fb/0x2e0 fs/gfs2/ops_fstype.c:1796 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x3d7/0x460 fs/namespace.c:1259 task_work_run+0x1d4/0x260 kernel/task_work.c:245 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:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9e8699f397 Code: a2 c7 05 5c 43 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 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 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffeb53aee58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f9e86a3448b RCX: 00007f9e8699f397 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffeb53aef10 RBP: 00007ffeb53aef10 R08: 00007ffeb53aff10 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb53affa0 R13: 00007f9e86a3448b R14: 0000000000015022 R15: 00007ffeb53affe0 Allocated by task 5845: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519 kmem_cache_zalloc include/linux/slab.h:711 [inline] gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_data+0x1fb/0x5f0 fs/gfs2/trans.c:209 gfs2_trans_add_databufs+0x15a/0x1c0 fs/gfs2/aops.c:57 gfs2_iomap_put_folio+0x1be/0x410 fs/gfs2/bmap.c:994 iomap_write_end+0x631/0xbc0 fs/iomap/buffered-io.c:897 iomap_write_iter fs/iomap/buffered-io.c:963 [inline] iomap_file_buffered_write+0x751/0xda0 fs/iomap/buffered-io.c:1008 gfs2_file_buffered_write+0x4c0/0x820 fs/gfs2/file.c:1060 gfs2_file_write_iter+0x43d/0xe90 fs/gfs2/file.c:1158 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x474/0x9a0 fs/read_write.c:584 ksys_write+0x151/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 3486: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] kmem_cache_free+0xf8/0x290 mm/slub.c:3852 trans_drain fs/gfs2/log.c:1023 [inline] __gfs2_log_flush+0x18fd/0x24d0 fs/gfs2/log.c:1162 gfs2_log_flush+0x34/0x50 fs/gfs2/log.c:1180 gfs2_write_inode+0x1ec/0x370 fs/gfs2/super.c:457 write_inode fs/fs-writeback.c:1534 [inline] __writeback_single_inode+0x720/0xee0 fs/fs-writeback.c:1751 writeback_sb_inodes+0x813/0x1020 fs/fs-writeback.c:1977 wb_writeback+0x45e/0xbe0 fs/fs-writeback.c:2156 wb_do_writeback fs/fs-writeback.c:2303 [inline] wb_workfn+0x400/0xe60 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:2657 [inline] process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2734 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2815 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 The buggy address belongs to the object at ffff88801d7231c0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff88801d7231c0, ffff88801d723210) The buggy address belongs to the physical page: page:ffffea000075c8c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d723 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888145edc500 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000240024 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5845, tgid 5844 (syz.0.1), ts 85826138460, free_ts 85729927702 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582 prep_new_page mm/page_alloc.c:1589 [inline] get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501 alloc_slab_page+0x5d/0x180 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x109/0x2c0 mm/slub.c:3519 kmem_cache_zalloc include/linux/slab.h:711 [inline] gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_meta+0x31b/0xc60 fs/gfs2/trans.c:251 do_gfs2_set_flags fs/gfs2/file.c:265 [inline] gfs2_fileattr_set+0x6da/0x970 fs/gfs2/file.c:311 vfs_fileattr_set+0x85d/0xb10 fs/ioctl.c:697 ioctl_setflags fs/ioctl.c:729 [inline] do_vfs_ioctl+0x1442/0x1cc0 fs/ioctl.c:840 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0x83/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1182 [inline] free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2459 discard_slab mm/slub.c:2127 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2667 put_cpu_partial+0x17c/0x250 mm/slub.c:2743 __slab_free+0x319/0x400 mm/slub.c:3700 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:770 slab_alloc_node mm/slub.c:3495 [inline] __kmem_cache_alloc_node+0x194/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa7/0x240 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] tomoyo_realpath_from_path+0xe6/0x5c0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x282/0x560 security/tomoyo/file.c:822 security_file_truncate+0x62/0x90 security/security.c:2987 handle_truncate fs/namei.c:3340 [inline] do_open fs/namei.c:3687 [inline] path_openat+0x29fe/0x3270 fs/namei.c:3844 do_filp_open+0x1f2/0x430 fs/namei.c:3871 Memory state around the buggy address: ffff88801d723080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ffff88801d723100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb >ffff88801d723180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff88801d723200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ffff88801d723280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc ==================================================================