================================================================== BUG: KASAN: use-after-free in xfs_qm_dqfree_one+0x181/0x1a0 fs/xfs/xfs_qm.c:1604 Read of size 4 at addr ffff88805269001c by task kswapd1/139 CPU: 3 PID: 139 Comm: kswapd1 Not tainted 6.1.0-rc8-syzkaller-00018-g479174d402bc #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 xfs_qm_dqfree_one+0x181/0x1a0 fs/xfs/xfs_qm.c:1604 xfs_qm_shrink_scan fs/xfs/xfs_qm.c:523 [inline] xfs_qm_shrink_scan+0x291/0x370 fs/xfs/xfs_qm.c:495 do_shrink_slab+0x464/0xce0 mm/vmscan.c:842 shrink_slab+0x175/0x660 mm/vmscan.c:1002 shrink_node_memcgs mm/vmscan.c:6112 [inline] shrink_node+0x93d/0x1f30 mm/vmscan.c:6141 kswapd_shrink_node mm/vmscan.c:6930 [inline] balance_pgdat+0x8f5/0x1530 mm/vmscan.c:7120 kswapd+0x70b/0xfc0 mm/vmscan.c:7380 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 5833: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x82/0x90 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x2b4/0x3d0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:679 [inline] xfs_dquot_alloc+0x2a/0x690 fs/xfs/xfs_dquot.c:475 xfs_qm_dqread+0x7b/0x810 fs/xfs/xfs_dquot.c:659 xfs_qm_dqget_inode+0x1fd/0x9f0 fs/xfs/xfs_dquot.c:973 xfs_qm_dqattach_one+0x2a8/0x760 fs/xfs/xfs_qm.c:277 xfs_qm_dqattach_locked+0x192/0x2c0 fs/xfs/xfs_qm.c:328 xfs_qm_dqattach fs/xfs/xfs_qm.c:370 [inline] xfs_qm_dqattach+0x46/0x70 fs/xfs/xfs_qm.c:361 xfs_setattr_size+0x686/0xdb0 fs/xfs/xfs_iops.c:819 xfs_vn_setattr_size fs/xfs/xfs_iops.c:990 [inline] xfs_vn_setattr+0x21e/0x8d0 fs/xfs/xfs_iops.c:1015 notify_change+0xcd4/0x1440 fs/attr.c:420 do_truncate+0x140/0x200 fs/open.c:65 handle_truncate fs/namei.c:3216 [inline] do_open fs/namei.c:3561 [inline] path_openat+0x2143/0x2860 fs/namei.c:3714 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_creat fs/open.c:1402 [inline] __se_sys_creat fs/open.c:1396 [inline] __ia32_sys_creat+0xcc/0x120 fs/open.c:1396 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 Freed by task 3765: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free+0xee/0x5c0 mm/slub.c:3683 xfs_qm_dqpurge+0x466/0x630 fs/xfs/xfs_qm.c:177 xfs_qm_dquot_walk.isra.0+0x1be/0x3f0 fs/xfs/xfs_qm.c:87 xfs_qm_dqpurge_all fs/xfs/xfs_qm.c:192 [inline] xfs_qm_unmount+0x5d/0x1a0 fs/xfs/xfs_qm.c:205 xfs_unmountfs+0xbe/0x1d0 fs/xfs/xfs_mount.c:1059 xfs_fs_put_super+0x77/0x3a0 fs/xfs/xfs_super.c:1115 generic_shutdown_super+0x158/0x410 fs/super.c:492 kill_block_super+0x9b/0xf0 fs/super.c:1428 deactivate_locked_super+0x98/0x160 fs/super.c:332 deactivate_super+0xb1/0xd0 fs/super.c:363 cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1186 task_work_run+0x16f/0x270 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 The buggy address belongs to the object at ffff888052690000 which belongs to the cache xfs_dquot of size 704 The buggy address is located 28 bytes inside of 704-byte region [ffff888052690000, ffff8880526902c0) The buggy address belongs to the physical page: page:ffffea000149a400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x52690 head:ffffea000149a400 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000010200 0000000000000000 dead000000000122 ffff888040099040 raw: 0000000000000000 0000000080130013 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1117, tgid 1117 (kworker/u17:9), ts 271749530150, free_ts 271740012221 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1794 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x31a/0x3d0 mm/slub.c:3422 kmem_cache_zalloc include/linux/slab.h:679 [inline] xfs_dquot_alloc+0x2a/0x690 fs/xfs/xfs_dquot.c:475 xfs_qm_dqread+0x7b/0x810 fs/xfs/xfs_dquot.c:659 xfs_qm_dqget+0x141/0x7a0 fs/xfs/xfs_dquot.c:870 xfs_qm_quotacheck_dqadjust+0xaa/0x640 fs/xfs/xfs_qm.c:1077 xfs_qm_dqusage_adjust+0x4ea/0x570 fs/xfs/xfs_qm.c:1196 xfs_iwalk_ag_recs+0x47e/0x8a0 fs/xfs/xfs_iwalk.c:220 xfs_iwalk_run_callbacks+0x1fa/0x4b0 fs/xfs/xfs_iwalk.c:376 xfs_iwalk_ag+0x731/0x930 fs/xfs/xfs_iwalk.c:482 xfs_iwalk_ag_work+0x14a/0x1c0 fs/xfs/xfs_iwalk.c:624 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 __stack_depot_save+0x16d/0x560 lib/stackdepot.c:506 kasan_save_stack+0x35/0x40 mm/kasan/common.c:46 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free+0xee/0x5c0 mm/slub.c:3683 xfs_iwalk_ag_work+0x17a/0x1c0 fs/xfs/xfs_iwalk.c:626 xfs_pwork_work+0x7f/0x160 fs/xfs/xfs_pwork.c:47 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff88805268ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88805268ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888052690000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888052690080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888052690100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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