================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: slab-use-after-free in mapping_unevictable include/linux/pagemap.h:260 [inline] BUG: KASAN: slab-use-after-free in folio_evictable+0x7b/0x270 mm/internal.h:370 Read of size 8 at addr ffff88801e491ee8 by task kswapd0/114 CPU: 3 UID: 0 PID: 114 Comm: kswapd0 Not tainted 6.10.0-syzkaller-12888-g5437f30d3458 #0 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 lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] mapping_unevictable include/linux/pagemap.h:260 [inline] folio_evictable+0x7b/0x270 mm/internal.h:370 sort_folio mm/vmscan.c:4295 [inline] scan_folios mm/vmscan.c:4412 [inline] isolate_folios+0xd0d/0x35b0 mm/vmscan.c:4537 evict_folios+0x19c/0x1b30 mm/vmscan.c:4568 try_to_shrink_lruvec+0x612/0x9b0 mm/vmscan.c:4775 shrink_one+0x3e3/0x7b0 mm/vmscan.c:4813 shrink_many mm/vmscan.c:4876 [inline] lru_gen_shrink_node+0x69f/0x1510 mm/vmscan.c:4954 shrink_node mm/vmscan.c:5934 [inline] kswapd_shrink_node mm/vmscan.c:6762 [inline] balance_pgdat+0x110f/0x1950 mm/vmscan.c:6954 kswapd+0x5ea/0xbf0 mm/vmscan.c:7223 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 37: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_lru_noprof+0x121/0x2f0 mm/slub.c:4056 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4626 alloc_inode+0x5d/0x230 fs/inode.c:263 new_inode_pseudo fs/inode.c:1038 [inline] new_inode+0x22/0x210 fs/inode.c:1057 __shmem_get_inode mm/shmem.c:2662 [inline] shmem_get_inode+0x194/0xe90 mm/shmem.c:2733 shmem_mknod+0x66/0x240 mm/shmem.c:3430 vfs_mknod+0x5d7/0x8e0 fs/namei.c:4088 handle_create drivers/base/devtmpfs.c:219 [inline] handle drivers/base/devtmpfs.c:384 [inline] devtmpfs_work_loop+0x1a8/0x7d0 drivers/base/devtmpfs.c:399 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:441 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 4831: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x12f/0x3a0 mm/slub.c:4548 i_callback+0x43/0x70 fs/inode.c:252 rcu_do_batch kernel/rcu/tree.c:2569 [inline] rcu_core+0x828/0x16b0 kernel/rcu/tree.c:2843 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:3106 destroy_inode+0x12c/0x1b0 fs/inode.c:318 iput_final fs/inode.c:1803 [inline] iput.part.0+0x5a8/0x7f0 fs/inode.c:1829 iput+0x5c/0x80 fs/inode.c:1819 do_unlinkat+0x613/0x750 fs/namei.c:4493 __do_sys_unlink fs/namei.c:4534 [inline] __se_sys_unlink fs/namei.c:4532 [inline] __ia32_sys_unlink+0xc4/0x110 fs/namei.c:4532 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff88801e491a20 which belongs to the cache shmem_inode_cache of size 1544 The buggy address is located 1224 bytes inside of freed 1544-byte region [ffff88801e491a20, ffff88801e492028) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1e490 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff888016ab3b80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000130013 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888016ab3b80 dead000000000122 0000000000000000 head: 0000000000000000 0000000000130013 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea0000792401 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 37, tgid 37 (kdevtmpfs), ts 8979337574, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3442 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4700 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] kmem_cache_alloc_lru_noprof+0x2a7/0x2f0 mm/slub.c:4056 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4626 alloc_inode+0x5d/0x230 fs/inode.c:263 new_inode_pseudo fs/inode.c:1038 [inline] new_inode+0x22/0x210 fs/inode.c:1057 __shmem_get_inode mm/shmem.c:2662 [inline] shmem_get_inode+0x194/0xe90 mm/shmem.c:2733 shmem_mknod+0x66/0x240 mm/shmem.c:3430 vfs_mknod+0x5d7/0x8e0 fs/namei.c:4088 handle_create drivers/base/devtmpfs.c:219 [inline] handle drivers/base/devtmpfs.c:384 [inline] devtmpfs_work_loop+0x1a8/0x7d0 drivers/base/devtmpfs.c:399 devtmpfsd+0x4c/0x50 drivers/base/devtmpfs.c:441 page_owner free stack trace missing Memory state around the buggy address: ffff88801e491d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e491e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801e491e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801e491f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801e491f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================