syzbot

==================================================================
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 ffff888059f041d8 by task syz-executor/5766

CPU: 1 PID: 5766 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 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+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+0x28a/0xfb0 mm/truncate.c:392
 gfs2_evict_inode+0x402/0x1350 fs/gfs2/super.c:1535
 evict+0x4ca/0x8d0 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+0x43b/0x4d0 fs/namespace.c:1259
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x95a/0x2460 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:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fe23c19c629
Code: Unable to access opcode bytes at 0x7fe23c19c5ff.
RSP: 002b:00007ffd36d3d588 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fe23c231f15 RCX: 00007fe23c19c629
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007fe23c231ef0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd36d3e7e0
R13: 00007fe23c231ef0 R14: 00000000000142ef R15: 00007ffd36d3e820
 </TASK>

Allocated by task 5962:
 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+0x6e/0x4b0 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+0x11a/0x2d0 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+0x631/0xb80 fs/iomap/buffered-io.c:885
 iomap_write_iter fs/iomap/buffered-io.c:951 [inline]
 iomap_file_buffered_write+0x751/0xd80 fs/iomap/buffered-io.c:1000
 gfs2_file_buffered_write+0x4bd/0x820 fs/gfs2/file.c:1060
 gfs2_file_write_iter+0x48d/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+0x46c/0x990 fs/read_write.c:584
 ksys_write+0x150/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 5996:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 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+0xf8/0x270 mm/slub.c:3852
 trans_drain fs/gfs2/log.c:1022 [inline]
 gfs2_log_flush+0x1923/0x2500 fs/gfs2/log.c:1162
 gfs2_write_inode+0x23f/0x3d0 fs/gfs2/super.c:457
 write_inode fs/fs-writeback.c:1483 [inline]
 __writeback_single_inode+0x705/0xec0 fs/fs-writeback.c:1700
 writeback_single_inode+0x21f/0x760 fs/fs-writeback.c:1756
 sync_inode_metadata+0xe0/0x140 fs/fs-writeback.c:2828
 gfs2_fsync+0x1b6/0x350 fs/gfs2/file.c:762
 vfs_fsync_range fs/sync.c:188 [inline]
 vfs_fsync fs/sync.c:202 [inline]
 do_fsync fs/sync.c:212 [inline]
 __do_sys_fsync fs/sync.c:220 [inline]
 __se_sys_fsync fs/sync.c:218 [inline]
 __x64_sys_fsync+0x195/0x1d0 fs/sync.c:218
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888059f041c0
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 freed 80-byte region [ffff888059f041c0, ffff888059f04210)

The buggy address belongs to the physical page:
page:ffffea000167c100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x59f04
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff8881446a2a00 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 5962, tgid 5960 (syz.3.20), ts 82397512719, free_ts 78347389294
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581
 prep_new_page mm/page_alloc.c:1588 [inline]
 get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4486
 alloc_slab_page+0x5d/0x160 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:2081
 ___slab_alloc+0xc5d/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+0x1b3/0x2d0 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+0x732/0x9e0 fs/gfs2/file.c:311
 vfs_fileattr_set+0x85d/0xb10 fs/ioctl.c:697
 ioctl_setflags fs/ioctl.c:729 [inline]
 do_vfs_ioctl+0x1449/0x1cc0 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+0x55/0xa0 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:1181 [inline]
 free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458
 vfree+0x1a6/0x320 mm/vmalloc.c:2868
 kcov_put kernel/kcov.c:438 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:534
 __fput+0x234/0x970 fs/file_table.c:384
 task_work_run+0x1d4/0x260 kernel/task_work.c:245
 exit_task_work include/linux/task_work.h:43 [inline]
 do_exit+0x95a/0x2460 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:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff888059f04080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
 ffff888059f04100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
>ffff888059f04180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
                                                    ^
 ffff888059f04200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
 ffff888059f04280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc
==================================================================