syzbot

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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 ffff888027e70018 by task syz-executor/4275

CPU: 0 PID: 4275 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+0x188/0x24e 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+0x293/0x1090 mm/truncate.c:393
 gfs2_evict_inode+0xae7/0x11d0 fs/gfs2/super.c:1513
 evict+0x4c9/0x8d0 fs/inode.c:705
 dispose_list fs/inode.c:738 [inline]
 evict_inodes+0x60c/0x6a0 fs/inode.c:792
 generic_shutdown_super+0x93/0x340 fs/super.c:480
 kill_block_super+0x7c/0xe0 fs/super.c:1470
 deactivate_locked_super+0x93/0xf0 fs/super.c:332
 cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191
 task_work_run+0x1d0/0x260 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x982/0x2480 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:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efe4379c799
Code: Unable to access opcode bytes at 0x7efe4379c76f.
RSP: 002b:00007ffdf997a7e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007efe43831fb5 RCX: 00007efe4379c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000005 R08: 0000000000000000 R09: 00007efe43831f90
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdf997ba40
R13: 00007efe43831f90 R14: 0000000000016724 R15: 00007ffdf997ba80
 </TASK>

Allocated by task 4585:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329
 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:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x123/0x2f0 mm/slub.c:3383
 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_page_add_databufs+0x1eb/0x270 fs/gfs2/aops.c:57
 gfs2_iomap_page_done+0xe0/0x180 fs/gfs2/bmap.c:978
 iomap_write_end+0x762/0xda0 fs/iomap/buffered-io.c:739
 iomap_write_iter fs/iomap/buffered-io.c:802 [inline]
 iomap_file_buffered_write+0x50f/0x8f0 fs/iomap/buffered-io.c:847
 gfs2_file_buffered_write+0x4fe/0x880 fs/gfs2/file.c:1057
 gfs2_file_write_iter+0x486/0xe90 fs/gfs2/file.c:1158
 call_write_iter include/linux/fs.h:2265 [inline]
 aio_write+0x545/0x780 fs/aio.c:1615
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x6cd/0x1380 fs/aio.c:2034
 __do_sys_io_submit fs/aio.c:2093 [inline]
 __se_sys_io_submit+0x19d/0x310 fs/aio.c:2063
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 4585:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 kmem_cache_free+0xf7/0x290 mm/slub.c:3709
 trans_drain fs/gfs2/log.c:1023 [inline]
 gfs2_log_flush+0x1959/0x2540 fs/gfs2/log.c:1162
 gfs2_jdata_writepages+0xf5/0x150 fs/gfs2/aops.c:392
 do_writepages+0x3ba/0x640 mm/page-writeback.c:2491
 filemap_fdatawrite_wbc+0x11e/0x180 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 filemap_fdatawrite_range+0xf3/0x160 mm/filemap.c:439
 gfs2_fsync+0xdb/0x340 fs/gfs2/file.c:747
 generic_write_sync include/linux/fs.h:2962 [inline]
 gfs2_file_write_iter+0xce3/0xe90 fs/gfs2/file.c:1160
 call_write_iter include/linux/fs.h:2265 [inline]
 aio_write+0x545/0x780 fs/aio.c:1615
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x6cd/0x1380 fs/aio.c:2034
 __do_sys_io_submit fs/aio.c:2093 [inline]
 __se_sys_io_submit+0x19d/0x310 fs/aio.c:2063
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888027e70000
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 24 bytes inside of
 80-byte region [ffff888027e70000, ffff888027e70050)

The buggy address belongs to the physical page:
page:ffffea00009f9c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27e70
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff88801b7d5780
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 4585, tgid 4546 (syz.4.39), ts 91614187884, free_ts 91456585055
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559
 prep_new_page mm/page_alloc.c:2566 [inline]
 get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5643
 alloc_slab_page+0x5d/0x160 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2c0 mm/slub.c:1997
 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x1b7/0x2f0 mm/slub.c:3383
 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_page_add_databufs+0x1eb/0x270 fs/gfs2/aops.c:57
 gfs2_iomap_page_done+0xe0/0x180 fs/gfs2/bmap.c:978
 iomap_write_end+0x762/0xda0 fs/iomap/buffered-io.c:739
 iomap_write_iter fs/iomap/buffered-io.c:802 [inline]
 iomap_file_buffered_write+0x50f/0x8f0 fs/iomap/buffered-io.c:847
 gfs2_file_buffered_write+0x4fe/0x880 fs/gfs2/file.c:1057
 gfs2_file_write_iter+0x486/0xe90 fs/gfs2/file.c:1158
 call_write_iter include/linux/fs.h:2265 [inline]
 aio_write+0x545/0x780 fs/aio.c:1615
 __io_submit_one fs/aio.c:-1 [inline]
 io_submit_one+0x6cd/0x1380 fs/aio.c:2034
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1486 [inline]
 free_pcp_prepare mm/page_alloc.c:1536 [inline]
 free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413
 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3554
 release_pages+0x1fa6/0x2220 mm/swap.c:1035
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:261
 tlb_finish_mmu+0xbd/0x1c0 mm/mmu_gather.c:361
 exit_mmap+0x384/0x960 mm/mmap.c:3262
 __mmput+0x118/0x3c0 kernel/fork.c:1205
 exit_mm+0x1fe/0x2d0 kernel/exit.c:565
 do_exit+0x905/0x2480 kernel/exit.c:867
 do_group_exit+0x217/0x2d0 kernel/exit.c:1022
 get_signal+0x1272/0x1350 kernel/signal.c:2871
 arch_do_signal_or_restart+0xc4/0x1350 arch/x86/kernel/signal.c:871
 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:292 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82

Memory state around the buggy address:
 ffff888027e6ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888027e6ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888027e70000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb
                            ^
 ffff888027e70080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
 ffff888027e70100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
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