================================================================== BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:381 [inline] BUG: KASAN: slab-use-after-free in gfs2_discard fs/gfs2/aops.c:593 [inline] BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:631 Read of size 8 at addr ffff888058b53be8 by task syz-executor230/9310 CPU: 0 UID: 0 PID: 9310 Comm: syz-executor230 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 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 list_empty include/linux/list.h:381 [inline] gfs2_discard fs/gfs2/aops.c:593 [inline] gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:631 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d8/0x430 mm/truncate.c:160 truncate_inode_pages_range+0x233/0xda0 mm/truncate.c:379 gfs2_evict_inode+0x87a/0x1000 fs/gfs2/super.c:1439 evict+0x504/0x9c0 fs/inode.c:810 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1761 [inline] gfs2_kill_sb+0x234/0x340 fs/gfs2/ops_fstype.c:1787 deactivate_locked_super+0xbc/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1393 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7feccecd4757 Code: 09 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fff434b9f38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00005555665757d0 RCX: 00007feccecd4757 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff434b9ff0 RBP: 00007fff434b9ff0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000202 R12: 00007fff434bb0b0 R13: 00005555665757d0 R14: 431bde82d7b634db R15: 00007fff434bb054 Allocated by task 9682: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4770 [inline] slab_alloc_node mm/slub.c:5068 [inline] kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5075 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:209 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:246 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1015 [inline] iomap_file_buffered_write+0x593/0x9b0 fs/iomap/buffered-io.c:1066 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 9703: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2474 [inline] slab_free mm/slub.c:6181 [inline] kmem_cache_free+0x19a/0x690 mm/slub.c:6292 trans_drain fs/gfs2/log.c:1025 [inline] gfs2_log_flush+0x18df/0x24c0 fs/gfs2/log.c:1165 gfs2_logd+0x2f1/0x1360 fs/gfs2/log.c:1323 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff888058b53bd0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff888058b53bd0, ffff888058b53c20) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x58b53 anon flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff888143292a00 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000240024 00000000f5000000 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 9454, tgid 9453 (syz-executor230), ts 492598625472, free_ts 492597057316 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3869 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5159 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2986 [inline] allocate_slab+0x8a/0x330 mm/slub.c:3154 new_slab mm/slub.c:3208 [inline] ___slab_alloc+0xbd1/0x13f0 mm/slub.c:4480 __slab_alloc+0x55/0xa0 mm/slub.c:4571 __slab_alloc_node mm/slub.c:4646 [inline] slab_alloc_node mm/slub.c:5056 [inline] kmem_cache_alloc_noprof+0x3f9/0x6e0 mm/slub.c:5075 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:209 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:246 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1015 [inline] iomap_file_buffered_write+0x593/0x9b0 fs/iomap/buffered-io.c:1066 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 page last free pid 23 tgid 23 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1394 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906 gfs2_end_log_write+0x54d/0x820 fs/gfs2/lops.c:226 blk_update_request+0x57e/0xe60 block/blk-mq.c:998 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1160 blk_flush_complete_seq+0x678/0xcc0 block/blk-flush.c:191 flush_end_io+0xbaf/0xe60 block/blk-flush.c:250 __blk_mq_end_request+0x46a/0x630 block/blk-mq.c:1150 blk_complete_reqs block/blk-mq.c:1235 [inline] blk_done_softirq+0x10a/0x160 block/blk-mq.c:1240 handle_softirqs+0x286/0x870 kernel/softirq.c:579 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:968 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888058b53a80: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ffff888058b53b00: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff888058b53b80: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ^ ffff888058b53c00: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888058b53c80: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ==================================================================