loop0: detected capacity change from 32768 to 0 gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x81d gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x821 gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x821 ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x31/0x190 lib/list_debug.c:49 Read of size 8 at addr ffff88801e9eb1e0 by task syz.0.0/5338 CPU: 0 UID: 0 PID: 5338 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_del_entry_valid_or_report+0x31/0x190 lib/list_debug.c:49 __list_del_entry_valid include/linux/list.h:132 [inline] __list_del_entry include/linux/list.h:223 [inline] list_del_init include/linux/list.h:295 [inline] gfs2_remove_from_journal+0x251/0x6c0 fs/gfs2/meta_io.c:352 gfs2_journal_wipe+0x3b3/0x8b0 fs/gfs2/meta_io.c:461 gfs2_dinode_dealloc+0x30d/0x3e0 fs/gfs2/inode.c:509 evict_unlinked_inode fs/gfs2/super.c:1317 [inline] gfs2_evict_inode+0xe0b/0x1000 fs/gfs2/super.c:1414 evict+0x5f4/0xae0 fs/inode.c:837 d_delete_notify include/linux/fsnotify.h:377 [inline] vfs_rmdir+0x3ee/0x660 fs/namei.c:5249 do_rmdir+0x27f/0x4a0 fs/namei.c:5291 __do_sys_rmdir fs/namei.c:5315 [inline] __se_sys_rmdir fs/namei.c:5313 [inline] __x64_sys_rmdir+0x47/0x50 fs/namei.c:5313 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5506b8f7c9 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:00007f5507a1f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000054 RAX: ffffffffffffffda RBX: 00007f5506de6090 RCX: 00007f5506b8f7c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000100 RBP: 00007f5506c13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5506de6128 R14: 00007f5506de6090 R15: 00007ffc9da81af8 Allocated by task 5337: 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:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5270 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_meta+0x2cf/0x960 fs/gfs2/trans.c:276 init_dinode+0x92/0xa70 fs/gfs2/inode.c:581 gfs2_create_inode+0x10d6/0x15b0 fs/gfs2/inode.c:863 gfs2_mkdir+0x9f/0xd0 fs/gfs2/inode.c:1352 vfs_mkdir+0x512/0x5b0 fs/namei.c:5130 do_mkdirat+0x276/0x4b0 fs/namei.c:5164 __do_sys_mkdir fs/namei.c:5191 [inline] __se_sys_mkdir fs/namei.c:5189 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:5189 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 3852: 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:584 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:2540 [inline] slab_free mm/slub.c:6668 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6779 trans_drain fs/gfs2/log.c:1007 [inline] gfs2_log_flush+0x1383/0x24c0 fs/gfs2/log.c:1153 gfs2_write_inode+0x23f/0x3e0 fs/gfs2/super.c:447 write_inode fs/fs-writeback.c:1582 [inline] __writeback_single_inode+0x7e1/0x1240 fs/fs-writeback.c:1802 writeback_sb_inodes+0x93a/0x1870 fs/fs-writeback.c:2030 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2107 wb_writeback+0x43f/0xaa0 fs/fs-writeback.c:2218 wb_check_start_all fs/fs-writeback.c:2344 [inline] wb_do_writeback fs/fs-writeback.c:2370 [inline] wb_workfn+0x8ee/0xed0 fs/fs-writeback.c:2403 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 The buggy address belongs to the object at ffff88801e9eb1c0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 32 bytes inside of freed 80-byte region [ffff88801e9eb1c0, ffff88801e9eb210) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e9eb flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff8880317a7b40 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 5337, tgid 5336 (syz.0.0), ts 95096162697, free_ts 94903297375 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xf2b/0x1960 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] kmem_cache_alloc_noprof+0x40f/0x710 mm/slub.c:5270 gfs2_alloc_bufdata fs/gfs2/trans.c:173 [inline] gfs2_trans_add_meta+0x2cf/0x960 fs/gfs2/trans.c:276 gfs2_alloc_extent fs/gfs2/rgrp.c:2237 [inline] gfs2_alloc_blocks+0x7a0/0x2080 fs/gfs2/rgrp.c:2447 alloc_dinode+0x258/0x550 fs/gfs2/inode.c:436 gfs2_create_inode+0xbc8/0x15b0 fs/gfs2/inode.c:822 gfs2_mkdir+0x9f/0xd0 fs/gfs2/inode.c:1352 vfs_mkdir+0x512/0x5b0 fs/namei.c:5130 do_mkdirat+0x276/0x4b0 fs/namei.c:5164 __do_sys_mkdir fs/namei.c:5191 [inline] __se_sys_mkdir fs/namei.c:5189 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:5189 page last free pid 78 tgid 78 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] free_unref_folios+0xdb3/0x14f0 mm/page_alloc.c:3000 shrink_folio_list+0x4800/0x5010 mm/vmscan.c:1603 evict_folios+0x473e/0x57f0 mm/vmscan.c:4711 try_to_shrink_lruvec+0x8a3/0xb50 mm/vmscan.c:4874 shrink_one+0x25c/0x720 mm/vmscan.c:4919 shrink_many mm/vmscan.c:4982 [inline] lru_gen_shrink_node mm/vmscan.c:5060 [inline] shrink_node+0x2f7d/0x35b0 mm/vmscan.c:6047 kswapd_shrink_node mm/vmscan.c:6901 [inline] balance_pgdat mm/vmscan.c:7084 [inline] kswapd+0x145a/0x2820 mm/vmscan.c:7354 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Memory state around the buggy address: ffff88801e9eb080: 00 00 00 00 00 00 00 00 fc fc fc fc fa fb fb fb ffff88801e9eb100: fb fb fb fb fb fb fc fc fc fc 00 00 00 00 00 00 >ffff88801e9eb180: 00 00 00 00 fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff88801e9eb200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ffff88801e9eb280: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fc fc ==================================================================