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 ffff88802e4f40f8 by task syz.2.4563/22050

CPU: 1 PID: 22050 Comm: syz.2.4563 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
 get_signal+0x12fc/0x13f0 kernel/signal.c:2902
 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fca1415d04e
Code: Unable to access opcode bytes at 0x7fca1415d024.
RSP: 002b:00007fca123f5f58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: fffffffffffffdfc RBX: 00007fca123f66c0 RCX: 00007fca1415d04e
RDX: 00007fca123f5fb0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fca14232c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fca14416038 R14: 00007fca14415fa0 R15: 00007ffe8fe17e88
 </TASK>

Allocated by task 22305:
 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:994
 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]
 aio_write+0x564/0x7d0 fs/aio.c:1593
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x73f/0x12a0 fs/aio.c:2012
 __do_sys_io_submit fs/aio.c:2071 [inline]
 __se_sys_io_submit+0x1a1/0x310 fs/aio.c:2041
 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 22305:
 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_jdata_writepages+0xf9/0x150 fs/gfs2/aops.c:398
 do_writepages+0x3b3/0x630 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+0xf7/0x160 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+0xcea/0xe90 fs/gfs2/file.c:1160
 call_write_iter include/linux/fs.h:2018 [inline]
 aio_write+0x564/0x7d0 fs/aio.c:1593
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x73f/0x12a0 fs/aio.c:2012
 __do_sys_io_submit fs/aio.c:2071 [inline]
 __se_sys_io_submit+0x1a1/0x310 fs/aio.c:2041
 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 ffff88802e4f40e0
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 freed 80-byte region [ffff88802e4f40e0, ffff88802e4f4130)

The buggy address belongs to the physical page:
page:ffffea0000b93d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2e4f4
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888019f8d780 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 22297, tgid 22296 (syz.2.4600), ts 1448206605048, free_ts 1447171881759
 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:4500
 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_list+0xbe/0x860 mm/page_alloc.c:2504
 release_pages+0x1f7a/0x2200 mm/swap.c:1022
 __folio_batch_release+0x71/0xe0 mm/swap.c:1042
 folio_batch_release include/linux/pagevec.h:83 [inline]
 truncate_inode_pages_range+0x3b9/0xfb0 mm/truncate.c:396
 kill_bdev block/bdev.c:76 [inline]
 set_blocksize+0x2fa/0x4b0 block/bdev.c:164
 sb_set_blocksize+0x4a/0x100 block/bdev.c:178
 init_sb+0x9e3/0x1340 fs/gfs2/ops_fstype.c:525
 gfs2_fill_super+0x148a/0x1f30 fs/gfs2/ops_fstype.c:1233
 get_tree_bdev+0x3f3/0x520 fs/super.c:1591
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1344
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24b/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 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:
 ffff88802e4f3f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802e4f4000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb
>ffff88802e4f4080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
                                                                ^
 ffff88802e4f4100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
 ffff88802e4f4180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================