================================================================== 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+0x463/0xa50 fs/gfs2/aops.c:660 Read of size 8 at addr ffff88802d1360f8 by task syz-executor/5790 CPU: 0 PID: 5790 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xac/0x220 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+0x463/0xa50 fs/gfs2/aops.c:660 folio_invalidate mm/truncate.c:158 [inline] truncate_cleanup_folio+0x220/0x5c0 mm/truncate.c:178 truncate_inode_pages_range+0x229/0xf00 mm/truncate.c:367 gfs2_evict_inode+0x3d8/0x1220 fs/gfs2/super.c:1537 evict+0x486/0x870 fs/inode.c:705 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1770 [inline] gfs2_kill_sb+0x230/0x320 fs/gfs2/ops_fstype.c:1796 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250 task_work_run+0x1ce/0x250 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0x90b/0x23c0 kernel/exit.c:883 do_group_exit+0x21b/0x2d0 kernel/exit.c:1024 __do_sys_exit_group kernel/exit.c:1035 [inline] __se_sys_exit_group kernel/exit.c:1033 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f0db578eec9 Code: Unable to access opcode bytes at 0x7f0db578ee9f. RSP: 002b:00007ffcdda14cd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f0db5811da2 RCX: 00007f0db578eec9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000005 R08: 00007ffcdda12a77 R09: 00007ffcdda15f30 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcdda15f30 R13: 00007f0db5811d7d R14: 0000000000046587 R15: 00007ffcdda15f70 Allocated by task 9724: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4d0 mm/slab.h:767 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+0x11e/0x2e0 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+0x1ff/0x620 fs/gfs2/trans.c:209 gfs2_unstuffer_page fs/gfs2/bmap.c:83 [inline] __gfs2_unstuff_inode fs/gfs2/bmap.c:121 [inline] gfs2_unstuff_dinode+0xb3a/0x17d0 fs/gfs2/bmap.c:168 gfs2_iomap_begin_write fs/gfs2/bmap.c:1050 [inline] gfs2_iomap_begin+0x9ea/0x1260 fs/gfs2/bmap.c:1126 iomap_iter+0x6b1/0xec0 fs/iomap/iter.c:91 iomap_file_buffered_write+0x1b5/0xd10 fs/iomap/buffered-io.c:974 gfs2_file_buffered_write+0x4bd/0x820 fs/gfs2/file.c:1060 gfs2_file_write_iter+0x427/0xe10 fs/gfs2/file.c:1158 call_write_iter include/linux/fs.h:2018 [inline] aio_write+0x53c/0x790 fs/aio.c:1593 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x70b/0x1240 fs/aio.c:2012 __do_sys_io_submit fs/aio.c:2071 [inline] __se_sys_io_submit+0x194/0x300 fs/aio.c:2041 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 9724: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] kmem_cache_free+0xf8/0x280 mm/slub.c:3852 trans_drain fs/gfs2/log.c:1022 [inline] gfs2_log_flush+0x18d1/0x24b0 fs/gfs2/log.c:1162 gfs2_jdata_writepages+0xf9/0x150 fs/gfs2/aops.c:398 do_writepages+0x3a2/0x600 mm/page-writeback.c:2575 filemap_fdatawrite_wbc+0x122/0x180 mm/filemap.c:390 __filemap_fdatawrite_range mm/filemap.c:423 [inline] filemap_fdatawrite_range+0xce/0x120 mm/filemap.c:441 gfs2_fsync+0xdf/0x350 fs/gfs2/file.c:751 generic_write_sync include/linux/fs.h:2651 [inline] gfs2_file_write_iter+0xc72/0xe10 fs/gfs2/file.c:1160 call_write_iter include/linux/fs.h:2018 [inline] aio_write+0x53c/0x790 fs/aio.c:1593 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x70b/0x1240 fs/aio.c:2012 __do_sys_io_submit fs/aio.c:2071 [inline] __se_sys_io_submit+0x194/0x300 fs/aio.c:2041 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88802d1360e0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff88802d1360e0, ffff88802d136130) The buggy address belongs to the physical page: page:ffffea0000b44d80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2d136 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff8881422e4640 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080240024 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 9652, tgid 9641 (syz.1.900), ts 287846944488, free_ts 282705082387 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554 prep_new_page mm/page_alloc.c:1561 [inline] get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457 alloc_slab_page+0x5d/0x170 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2e0 mm/slub.c:2081 ___slab_alloc+0xc6d/0x1300 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+0x1b7/0x2e0 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+0x30c/0xc20 fs/gfs2/trans.c:251 init_dinode+0x92/0xa70 fs/gfs2/inode.c:500 gfs2_create_inode+0xf32/0x1430 fs/gfs2/inode.c:776 gfs2_atomic_open+0xd2/0x220 fs/gfs2/inode.c:1315 atomic_open fs/namei.c:3351 [inline] lookup_open fs/namei.c:3459 [inline] open_last_lookups fs/namei.c:3556 [inline] path_openat+0xf27/0x3190 fs/namei.c:3786 do_filp_open+0x1c5/0x3d0 fs/namei.c:3816 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419 do_sys_open fs/open.c:1434 [inline] __do_sys_creat fs/open.c:1512 [inline] __se_sys_creat fs/open.c:1506 [inline] __x64_sys_creat+0x90/0xb0 fs/open.c:1506 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1154 [inline] free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2475 release_pages+0x1fa0/0x2220 mm/swap.c:1022 __folio_batch_release+0x71/0xe0 mm/swap.c:1042 folio_batch_release include/linux/pagevec.h:83 [inline] mapping_try_invalidate+0x438/0x4f0 mm/truncate.c:535 btrfs_close_bdev fs/btrfs/volumes.c:1151 [inline] btrfs_close_one_device fs/btrfs/volumes.c:1175 [inline] close_fs_devices+0x42b/0x860 fs/btrfs/volumes.c:1217 btrfs_close_devices+0xc6/0x500 fs/btrfs/volumes.c:1232 close_ctree+0x80f/0xca0 fs/btrfs/disk-io.c:4484 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_anon_super+0x3b/0x70 fs/super.c:1303 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2146 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250 task_work_run+0x1ce/0x250 kernel/task_work.c:239 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+0xf6/0x180 kernel/entry/common.c:210 Memory state around the buggy address: ffff88802d135f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802d136000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb >ffff88802d136080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ^ ffff88802d136100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ffff88802d136180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================