================================================================== BUG: KASAN: use-after-free in list_empty include/linux/list.h:292 [inline] BUG: KASAN: use-after-free in gfs2_discard fs/gfs2/aops.c:618 [inline] BUG: KASAN: use-after-free in gfs2_invalidate_folio+0x455/0xa70 fs/gfs2/aops.c:656 Read of size 8 at addr ffff8880272d2168 by task syz-executor/4264 CPU: 0 PID: 4264 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x22e 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 list_empty include/linux/list.h:292 [inline] gfs2_discard fs/gfs2/aops.c:618 [inline] gfs2_invalidate_folio+0x455/0xa70 fs/gfs2/aops.c:656 folio_invalidate mm/truncate.c:158 [inline] truncate_cleanup_folio+0x218/0x5e0 mm/truncate.c:178 truncate_inode_pages_range+0x237/0xff0 mm/truncate.c:368 gfs2_evict_inode+0xab5/0x1170 fs/gfs2/super.c:1511 evict+0x485/0x870 fs/inode.c:705 gfs2_put_super+0x412/0x8c0 fs/gfs2/super.c:616 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+0x463/0x4f0 fs/namespace.c:1182 task_work_run+0x1ca/0x250 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x93e/0x2400 kernel/exit.c:880 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 __do_sys_exit_group kernel/exit.c:1033 [inline] __se_sys_exit_group kernel/exit.c:1031 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe57f98ebe9 Code: Unable to access opcode bytes at 0x7fe57f98ebbf. RSP: 002b:00007fff8c3d97c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fe57fa11c2a RCX: 00007fe57f98ebe9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000005 R08: 00007fff8c3d7567 R09: 00007fff8c3daa20 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8c3daa20 R13: 00007fe57fa11c05 R14: 000000000001627c R15: 00007fff8c3daa60 Allocated by task 4512: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x4b/0x480 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:689 [inline] gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_data+0x1fb/0x610 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+0xf61/0x1770 fs/gfs2/bmap.c:168 gfs2_adjust_quota+0x234/0x810 fs/gfs2/quota.c:847 do_sync+0x800/0xc00 fs/gfs2/quota.c:965 gfs2_quota_sync+0x32c/0x6f0 fs/gfs2/quota.c:1329 gfs2_sync_fs+0x48/0xb0 fs/gfs2/super.c:660 iterate_supers+0x11e/0x1d0 fs/super.c:757 ksys_sync+0xa0/0x150 fs/sync.c:103 __ia32_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 4512: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free+0xf7/0x290 mm/slub.c:3683 trans_drain fs/gfs2/log.c:1023 [inline] gfs2_log_flush+0x1902/0x24e0 fs/gfs2/log.c:1161 do_sync+0x996/0xc00 fs/gfs2/quota.c:986 gfs2_quota_sync+0x32c/0x6f0 fs/gfs2/quota.c:1329 gfs2_sync_fs+0x48/0xb0 fs/gfs2/super.c:660 iterate_supers+0x11e/0x1d0 fs/super.c:757 ksys_sync+0xa0/0x150 fs/sync.c:103 __ia32_sys_sync+0xa/0x10 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff8880272d2150 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of 80-byte region [ffff8880272d2150, ffff8880272d21a0) The buggy address belongs to the physical page: page:ffffea00009cb480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x272d2 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000122 ffff888140fc9500 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 4512, tgid 4508 (syz.3.18), ts 90456261670, free_ts 90412242024 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x87/0x2c0 mm/slub.c:1992 ___slab_alloc+0xbc6/0x1220 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x1b7/0x2f0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:689 [inline] gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_meta+0x34e/0xc60 fs/gfs2/trans.c:250 gfs2_alloc_extent fs/gfs2/rgrp.c:2239 [inline] gfs2_alloc_blocks+0x79b/0x2070 fs/gfs2/rgrp.c:2450 __gfs2_unstuff_inode fs/gfs2/bmap.c:109 [inline] gfs2_unstuff_dinode+0x1f5/0x1770 fs/gfs2/bmap.c:168 gfs2_adjust_quota+0x234/0x810 fs/gfs2/quota.c:847 do_sync+0x800/0xc00 fs/gfs2/quota.c:965 gfs2_quota_sync+0x32c/0x6f0 fs/gfs2/quota.c:1329 gfs2_sync_fs+0x48/0xb0 fs/gfs2/super.c:660 iterate_supers+0x11e/0x1d0 fs/super.c:757 ksys_sync+0xa0/0x150 fs/sync.c:103 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3525 release_pages+0x1f92/0x2200 mm/swap.c:1035 __pagevec_release+0x6d/0xe0 mm/swap.c:1055 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] truncate_inode_pages_range+0x2f6/0xff0 mm/truncate.c:372 kill_bdev block/bdev.c:76 [inline] blkdev_flush_mapping+0x12c/0x290 block/bdev.c:664 blkdev_put_whole block/bdev.c:695 [inline] blkdev_put+0x47f/0x710 block/bdev.c:955 deactivate_locked_super+0x93/0xf0 fs/super.c:332 cleanup_mnt+0x463/0x4f0 fs/namespace.c:1182 task_work_run+0x1ca/0x250 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+0xb1/0x140 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:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff8880272d2000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ffff8880272d2080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff8880272d2100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ^ ffff8880272d2180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff8880272d2200: fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================