loop0: detected capacity change from 32768 to 0 gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x2095 gfs2: fsid=syz:syz.0: GFS2:adding buf while withdrawn! 0x2095 ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x31/0x190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 ffff888040d74100 by task syz.0.0/5336 CPU: 0 UID: 0 PID: 5336 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+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_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_unlinkat fs/namei.c:5468 [inline] __se_sys_unlinkat fs/namei.c:5462 [inline] __x64_sys_unlinkat+0xc2/0xf0 fs/namei.c:5462 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 RIP: 0033:0x7fe30ad8f7c9 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:00007fe30bbe7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 00007fe30afe6090 RCX: 00007fe30ad8f7c9 RDX: 0000000000000200 RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007fe30ae13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe30afe6128 R14: 00007fe30afe6090 R15: 00007ffc3cfaa4c8 Allocated by task 5335: 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_mkdirat fs/namei.c:5186 [inline] __se_sys_mkdirat fs/namei.c:5184 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5184 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 5335: 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:6670 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6781 trans_drain fs/gfs2/log.c:1007 [inline] gfs2_log_flush+0x1383/0x24c0 fs/gfs2/log.c:1153 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+0x5ef/0xeb0 fs/iomap/iter.c:110 iomap_file_buffered_write+0x7f9/0x9c0 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 ffff888040d740e0 which belongs to the cache gfs2_bufdata of size 80 The buggy address is located 32 bytes inside of freed 80-byte region [ffff888040d740e0, ffff888040d74130) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x40d74 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000000 ffff888000b3ea00 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5335, tgid 5334 (syz.0.0), ts 74546389599, free_ts 74449507213 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+0x24e0/0x2580 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+0xe53/0x1820 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_mkdirat fs/namei.c:5186 [inline] __se_sys_mkdirat fs/namei.c:5184 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:5184 page last free pid 15 tgid 15 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 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xc8e/0x1720 kernel/rcu/tree.c:2857 handle_softirqs+0x22b/0x7c0 kernel/softirq.c:622 run_ksoftirqd+0x36/0x60 kernel/softirq.c:1063 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 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: ffff888040d74000: fa fb fb fb fb fb fb fb fb fb fc fc fc fc fa fb ffff888040d74080: fb fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb >ffff888040d74100: fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb fb ^ ffff888040d74180: fb fb fb fb fc fc fc fc fa fb fb fb fb fb fb fb ffff888040d74200: fb fb fc fc fc fc fa fb fb fb fb fb fb fb fb fb ==================================================================