================================================================== BUG: KASAN: slab-use-after-free in list_empty include/linux/list.h:381 [inline] BUG: KASAN: slab-use-after-free in gfs2_discard fs/gfs2/aops.c:593 [inline] BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:631 Read of size 8 at addr ffff888051347398 by task syz.0.0/5316 CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 list_empty include/linux/list.h:381 [inline] gfs2_discard fs/gfs2/aops.c:593 [inline] gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:631 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d8/0x430 mm/truncate.c:160 truncate_inode_pages_range+0x233/0xda0 mm/truncate.c:379 gfs2_evict_inode+0x87a/0x1000 fs/gfs2/super.c:1439 evict+0x504/0x9c0 fs/inode.c:810 __dentry_kill+0x209/0x660 fs/dcache.c:669 dput+0x19f/0x2b0 fs/dcache.c:911 __fput+0x68e/0xa70 fs/file_table.c:476 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f36cb38efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffab7739b8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00000000000129f4 RCX: 00007f36cb38efc9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f36cb5e7da0 R08: 0000000000000001 R09: 0000001eab773caf R10: 00007f36cb1ff02c R11: 0000000000000246 R12: 00007f36cb5e5fac R13: 00007f36cb5e5fa0 R14: ffffffffffffffff R15: 00007fffab773ad0 Allocated by task 5317: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:342 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:368 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4970 [inline] slab_alloc_node mm/slub.c:5280 [inline] kmem_cache_alloc_noprof+0x367/0x6e0 mm/slub.c:5287 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:209 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:246 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1020 [inline] iomap_file_buffered_write+0x593/0x9b0 fs/iomap/buffered-io.c:1071 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 aio_write+0x535/0x7a0 fs/aio.c:1634 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x78b/0x1310 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit+0x185/0x2f0 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5317: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587 kasan_save_free_info mm/kasan/kasan.h:406 [inline] poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2539 [inline] slab_free mm/slub.c:6630 [inline] kmem_cache_free+0x19b/0x690 mm/slub.c:6740 trans_drain fs/gfs2/log.c:1025 [inline] gfs2_log_flush+0x18df/0x24c0 fs/gfs2/log.c:1165 gfs2_jdata_writepages+0xf9/0x150 fs/gfs2/aops.c:374 do_writepages+0x32e/0x550 mm/page-writeback.c:2604 filemap_fdatawrite_wbc mm/filemap.c:389 [inline] __filemap_fdatawrite_range mm/filemap.c:422 [inline] filemap_fdatawrite_range+0x1a5/0x250 mm/filemap.c:440 gfs2_fsync+0xd8/0x370 fs/gfs2/file.c:752 generic_write_sync include/linux/fs.h:3046 [inline] gfs2_file_write_iter+0xeb7/0x1100 fs/gfs2/file.c:1168 aio_write+0x535/0x7a0 fs/aio.c:1634 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x78b/0x1310 fs/aio.c:2053 __do_sys_io_submit fs/aio.c:2112 [inline] __se_sys_io_submit+0x185/0x2f0 fs/aio.c:2082 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888051347380 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff888051347380, ffff8880513473d0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x51347 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff888032aa9b40 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080240024 00000000f5000000 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5317, tgid 5316 (syz.0.0), ts 77493947998, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:3055 [inline] allocate_slab+0x96/0x350 mm/slub.c:3228 new_slab mm/slub.c:3282 [inline] ___slab_alloc+0xe94/0x18a0 mm/slub.c:4651 __slab_alloc+0x65/0x100 mm/slub.c:4770 __slab_alloc_node mm/slub.c:4846 [inline] slab_alloc_node mm/slub.c:5268 [inline] kmem_cache_alloc_noprof+0x3f9/0x6e0 mm/slub.c:5287 gfs2_alloc_bufdata fs/gfs2/trans.c:168 [inline] gfs2_trans_add_meta+0x2cf/0xa10 fs/gfs2/trans.c:272 do_gfs2_set_flags fs/gfs2/file.c:265 [inline] gfs2_fileattr_set+0x780/0x9b0 fs/gfs2/file.c:311 vfs_fileattr_set+0x932/0xb90 fs/file_attr.c:298 ioctl_setflags+0x180/0x1e0 fs/file_attr.c:334 do_vfs_ioctl+0x8ed/0x1430 fs/ioctl.c:560 __do_sys_ioctl fs/ioctl.c:595 [inline] __se_sys_ioctl+0x82/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page_owner free stack trace missing Memory state around the buggy address: ffff888051347280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc ffff888051347300: fc fc fa fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff888051347380: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ^ ffff888051347400: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb ffff888051347480: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ==================================================================