loop0: detected capacity change from 32768 to 64 gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x2095 gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x2095 ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x31/0x190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 ffff888044621100 by task syz.0.0/5345 CPU: 0 UID: 0 PID: 5345 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 __dentry_kill+0x209/0x660 fs/dcache.c:670 finish_dput+0xc9/0x480 fs/dcache.c:879 __fput+0x68e/0xa70 fs/file_table.c:476 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+0xff/0x4f0 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+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f515618f7c9 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:00007f5156f9a038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f51563e5fa0 RCX: 00007f515618f7c9 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000 RBP: 00007f5156213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f51563e6038 R14: 00007f51563e5fa0 R15: 00007ffdbb7194f8 Allocated by task 5345: 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_atomic_open+0x116/0x200 fs/gfs2/inode.c:1402 atomic_open fs/namei.c:4295 [inline] lookup_open fs/namei.c:4406 [inline] open_last_lookups fs/namei.c:4540 [inline] path_openat+0x11f8/0x3dd0 fs/namei.c:4784 do_filp_open+0x1fa/0x410 fs/namei.c:4814 do_sys_openat2+0x121/0x200 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1447 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 3220: 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 ffff8880446210e0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 32 bytes inside of freed 80-byte region [ffff8880446210e0, ffff888044621130) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x44621 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff888000f568c0 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 5345, tgid 5344 (syz.0.0), ts 86917382741, free_ts 86815831783 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_atomic_open+0x116/0x200 fs/gfs2/inode.c:1402 atomic_open fs/namei.c:4295 [inline] lookup_open fs/namei.c:4406 [inline] open_last_lookups fs/namei.c:4540 [inline] path_openat+0x11f8/0x3dd0 fs/namei.c:4784 do_filp_open+0x1fa/0x410 fs/namei.c:4814 do_sys_openat2+0x121/0x200 fs/open.c:1430 page last free pid 5346 tgid 5344 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943 __slab_free+0x21b/0x2a0 mm/slub.c:6004 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:349 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 alloc_buffer_head+0x2a/0x270 fs/buffer.c:3025 folio_alloc_buffers+0x32d/0x640 fs/buffer.c:935 create_empty_buffers+0x3a/0x530 fs/buffer.c:1691 gfs2_getbuf+0x20c/0x6d0 fs/gfs2/meta_io.c:149 gfs2_meta_ra+0x1a9/0x420 fs/gfs2/meta_io.c:538 gfs2_quota_init+0x4e3/0x1200 fs/gfs2/quota.c:1427 gfs2_make_fs_rw+0x143/0x220 fs/gfs2/super.c:149 gfs2_fill_super+0x1b6a/0x21b0 fs/gfs2/ops_fstype.c:1275 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1691 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1332 Memory state around the buggy address: ffff888044621000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ffff888044621080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff888044621100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ^ ffff888044621180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888044621200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ==================================================================