================================================================== 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 ffff88805e0890f8 by task syz-executor/5788 CPU: 1 PID: 5788 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 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:392 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:1259 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: 0033:0x7fd46338f749 Code: Unable to access opcode bytes at 0x7fd46338f71f. RSP: 002b:00007ffda6c9ef18 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007fd463413da2 RCX: 00007fd46338f749 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000005 R08: 00007ffda6c9ccb7 R09: 00007ffda6ca0170 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffda6ca0170 R13: 00007fd463413d7d R14: 0000000000016339 R15: 00007ffda6ca01b0 Allocated by task 6317: 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_trans_add_databufs+0x15a/0x1c0 fs/gfs2/aops.c:57 gfs2_iomap_put_folio+0x1be/0x400 fs/gfs2/bmap.c:988 iomap_write_end+0x631/0xb90 fs/iomap/buffered-io.c:860 iomap_write_iter fs/iomap/buffered-io.c:926 [inline] iomap_file_buffered_write+0x710/0xd10 fs/iomap/buffered-io.c:975 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] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x43b/0x940 fs/read_write.c:584 ksys_write+0x147/0x250 fs/read_write.c:637 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 6260: 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_inplace_reserve+0x1705/0x3300 fs/gfs2/rgrp.c:2188 do_grow fs/gfs2/bmap.c:2072 [inline] gfs2_setattr_size+0xd5c/0xfc0 fs/gfs2/bmap.c:2143 gfs2_setattr+0x244/0x3f0 fs/gfs2/inode.c:2025 notify_change+0xb0d/0xe10 fs/attr.c:499 do_truncate+0x19b/0x220 fs/open.c:66 do_sys_ftruncate+0x325/0x3d0 fs/open.c:194 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 ffff88805e0890e0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff88805e0890e0, ffff88805e089130) The buggy address belongs to the physical page: page:ffffea0001782240 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e089 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888019be53c0 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 6260, tgid 6259 (syz.1.55), ts 90221687355, free_ts 90217610890 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 do_gfs2_set_flags fs/gfs2/file.c:265 [inline] gfs2_fileattr_set+0x77d/0x9b0 fs/gfs2/file.c:311 vfs_fileattr_set+0x846/0xaf0 fs/ioctl.c:697 ioctl_setflags fs/ioctl.c:729 [inline] do_vfs_ioctl+0x135a/0x1bb0 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:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 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: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 tlb_batch_pages_flush mm/mmu_gather.c:98 [inline] tlb_flush_mmu_free mm/mmu_gather.c:293 [inline] tlb_flush_mmu+0x368/0x4f0 mm/mmu_gather.c:300 tlb_finish_mmu+0xc3/0x1d0 mm/mmu_gather.c:392 exit_mmap+0x3f0/0xb50 mm/mmap.c:3315 __mmput+0x118/0x3c0 kernel/fork.c:1355 exec_mmap+0x584/0x640 fs/exec.c:1036 begin_new_exec+0xa2e/0x1eb0 fs/exec.c:1294 load_elf_binary+0x9a0/0x2700 fs/binfmt_elf.c:1027 search_binary_handler fs/exec.c:1775 [inline] exec_binprm fs/exec.c:1817 [inline] bprm_execve+0xaeb/0x16f0 fs/exec.c:1892 do_execveat_common+0x51b/0x6c0 fs/exec.c:1998 do_execve fs/exec.c:2072 [inline] __do_sys_execve fs/exec.c:2148 [inline] __se_sys_execve fs/exec.c:2143 [inline] __x64_sys_execve+0x92/0xa0 fs/exec.c:2143 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 Memory state around the buggy address: ffff88805e088f80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88805e089000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb >ffff88805e089080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ^ ffff88805e089100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ffff88805e089180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ==================================================================