================================================================== 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:589 [inline] BUG: KASAN: slab-use-after-free in gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:627 Read of size 8 at addr ffff888051107be8 by task syz-executor/6826 CPU: 0 UID: 0 PID: 6826 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0xe8/0x150 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:589 [inline] gfs2_invalidate_folio+0x40b/0x750 fs/gfs2/aops.c:627 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d8/0x430 mm/truncate.c:160 truncate_inode_pages_range+0x233/0xd90 mm/truncate.c:404 gfs2_evict_inode+0x87a/0x1000 fs/gfs2/super.c:1426 evict+0x5f4/0xae0 fs/inode.c:837 gfs2_evict_inodes fs/gfs2/ops_fstype.c:1760 [inline] gfs2_kill_sb+0x2bc/0x430 fs/gfs2/ops_fstype.c:1786 deactivate_locked_super+0xbc/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1312 task_work_run+0x1d4/0x260 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:44 [inline] exit_to_user_mode_loop+0xef/0x4e0 kernel/entry/common.c:75 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline] do_syscall_64+0x2c1/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f126f790a77 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffdff69b898 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f126f813d7d RCX: 00007f126f790a77 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdff69b950 RBP: 00007ffdff69b950 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdff69c9e0 R13: 00007f126f813d7d R14: 00000000000677b5 R15: 00007ffdff69ca20 Allocated by task 10190: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4969 [inline] slab_alloc_node mm/slub.c:5283 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5290 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:214 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:251 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline] iomap_file_buffered_write+0x5b2/0x9c0 fs/iomap/buffered-io.c:1188 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 10190: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2556 [inline] slab_free mm/slub.c:6690 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6801 trans_drain fs/gfs2/log.c:1016 [inline] gfs2_log_flush+0x17a2/0x24c0 fs/gfs2/log.c:1154 gfs2_inplace_reserve+0x178f/0x3330 fs/gfs2/rgrp.c:2186 gfs2_iomap_begin_write fs/gfs2/bmap.c:1040 [inline] gfs2_iomap_begin+0x772/0x1170 fs/gfs2/bmap.c:1133 iomap_iter+0x600/0xf40 fs/iomap/iter.c:110 iomap_file_buffered_write+0x23c/0x9c0 fs/iomap/buffered-io.c:1187 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888051107bd0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 24 bytes inside of freed 80-byte region [ffff888051107bd0, ffff888051107c20) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x51107 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801c7a4c80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000240024 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 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 10190, tgid 10189 (syz.6.893), ts 423179937114, free_ts 421147117041 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x23d/0x2a0 mm/page_alloc.c:1887 prep_new_page mm/page_alloc.c:1895 [inline] get_page_from_freelist+0x23a5/0x2440 mm/page_alloc.c:3948 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5257 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3091 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3264 new_slab mm/slub.c:3318 [inline] ___slab_alloc+0xdb6/0x17b0 mm/slub.c:4672 __slab_alloc+0x65/0x100 mm/slub.c:4795 __slab_alloc_node mm/slub.c:4871 [inline] slab_alloc_node mm/slub.c:5271 [inline] kmem_cache_alloc_noprof+0x40f/0x710 mm/slub.c:5290 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_data+0x200/0x620 fs/gfs2/trans.c:214 gfs2_trans_add_databufs+0x12f/0x1a0 fs/gfs2/trans.c:251 gfs2_iomap_put_folio+0x223/0x480 fs/gfs2/bmap.c:995 iomap_write_iter fs/iomap/buffered-io.c:1137 [inline] iomap_file_buffered_write+0x5b2/0x9c0 fs/iomap/buffered-io.c:1188 gfs2_file_buffered_write+0x4ed/0x880 fs/gfs2/file.c:1061 gfs2_file_write_iter+0x94e/0x1100 fs/gfs2/file.c:1166 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 page last free pid 5191 tgid 5191 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1436 [inline] __free_frozen_pages+0xb99/0xd10 mm/page_alloc.c:2976 discard_slab mm/slub.c:3362 [inline] __put_partials+0x146/0x170 mm/slub.c:3902 __slab_free+0x294/0x320 mm/slub.c:5972 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4969 [inline] slab_alloc_node mm/slub.c:5283 [inline] __do_kmalloc_node mm/slub.c:5676 [inline] __kmalloc_noprof+0x3cf/0x800 mm/slub.c:5689 kmalloc_noprof include/linux/slab.h:962 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x213/0x4b0 security/tomoyo/file.c:827 security_inode_getattr+0x12f/0x330 security/security.c:1869 vfs_getattr fs/stat.c:259 [inline] vfs_fstat fs/stat.c:281 [inline] __do_sys_newfstat fs/stat.c:555 [inline] __se_sys_newfstat fs/stat.c:550 [inline] __x64_sys_newfstat+0xfc/0x200 fs/stat.c:550 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888051107a80: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ffff888051107b00: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff888051107b80: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ^ ffff888051107c00: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888051107c80: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ==================================================================