gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x2095
gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x2095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 ffff888011f39100 by task syz.0.0/5341

CPU: 0 UID: 0 PID: 5341 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:
 <TASK>
 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+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe1e7b8f7c9
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:00007fe1e8961038 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fe1e7de6090 RCX: 00007fe1e7b8f7c9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: 00007fe1e7c13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe1e7de6128 R14: 00007fe1e7de6090 R15: 00007ffd7cf8ff58
 </TASK>

Allocated by task 5340:
 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 5340:
 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_single_inode+0x493/0xc70 fs/fs-writeback.c:1858
 sync_inode_metadata+0xb9/0x110 fs/fs-writeback.c:2944
 gfs2_fsync+0x1a6/0x370 fs/gfs2/file.c:763
 generic_write_sync include/linux/fs.h:2616 [inline]
 gfs2_file_write_iter+0xddb/0x1100 fs/gfs2/file.c:1155
 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+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888011f390e0
 which belongs to the cache gfs2_bufdata of size 80
The buggy address is located 32 bytes inside of
 freed 80-byte region [ffff888011f390e0, ffff888011f39130)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11f39
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff8880006bfc80 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 5340, tgid 5339 (syz.0.0), ts 76047096028, free_ts 75848730237
 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 5312 tgid 5312 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
 discard_slab mm/slub.c:3346 [inline]
 __put_partials+0x146/0x170 mm/slub.c:3886
 put_cpu_partial+0x1f2/0x2d0 mm/slub.c:3961
 __slab_free+0x288/0x2a0 mm/slub.c:5952
 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
 getname_flags+0xb8/0x540 fs/namei.c:146
 user_path_at+0x24/0x60 fs/namei.c:3566
 inotify_find_inode fs/notify/inotify/inotify_user.c:377 [inline]
 __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:771 [inline]
 __se_sys_inotify_add_watch+0x182/0xf10 fs/notify/inotify/inotify_user.c:729
 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

Memory state around the buggy address:
 ffff888011f39000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb
 ffff888011f39080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb
>ffff888011f39100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb
                   ^
 ffff888011f39180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb
 ffff888011f39200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb
==================================================================