================================================================== 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:269 [inline] BUG: KASAN: slab-use-after-free in folio_evictable+0x7b/0x270 mm/internal.h:389 Read of size 8 at addr ffff888022896d48 by task kswapd0/106 CPU: 3 UID: 0 PID: 106 Comm: kswapd0 Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #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:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 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:269 [inline] folio_evictable+0x7b/0x270 mm/internal.h:389 sort_folio mm/vmscan.c:4298 [inline] scan_folios mm/vmscan.c:4415 [inline] isolate_folios+0xd3f/0x35f0 mm/vmscan.c:4540 evict_folios+0x187/0x1970 mm/vmscan.c:4571 try_to_shrink_lruvec+0x612/0x9b0 mm/vmscan.c:4778 shrink_one+0x3e3/0x7b0 mm/vmscan.c:4816 shrink_many mm/vmscan.c:4879 [inline] lru_gen_shrink_node mm/vmscan.c:4957 [inline] shrink_node+0x2452/0x39d0 mm/vmscan.c:5937 kswapd_shrink_node mm/vmscan.c:6765 [inline] balance_pgdat+0xc19/0x18f0 mm/vmscan.c:6957 kswapd+0x5ea/0xbf0 mm/vmscan.c:7226 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:319 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_lru_noprof+0x121/0x2f0 mm/slub.c:4153 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4769 alloc_inode+0x5d/0x230 fs/inode.c:263 new_inode_pseudo fs/inode.c:1102 [inline] new_inode+0x22/0x210 fs/inode.c:1121 __shmem_get_inode mm/shmem.c:2806 [inline] shmem_get_inode+0x194/0xea0 mm/shmem.c:2877 shmem_mknod+0x66/0x240 mm/shmem.c:3573 vfs_mknod+0x5d7/0x8e0 fs/namei.c:4135 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 24: 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 mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kmem_cache_free+0x152/0x4b0 mm/slub.c:4681 i_callback+0x43/0x70 fs/inode.c:252 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0x79d/0x14d0 kernel/rcu/tree.c:2823 handle_softirqs+0x213/0x8f0 kernel/softirq.c:554 run_ksoftirqd kernel/softirq.c:927 [inline] run_ksoftirqd+0x3a/0x60 kernel/softirq.c:919 smpboot_thread_fn+0x661/0xa30 kernel/smpboot.c:164 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 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+0x99/0x7a0 kernel/rcu/tree.c:3086 destroy_inode+0x12c/0x1b0 fs/inode.c:318 evict+0x5f3/0x970 fs/inode.c:754 iput_final fs/inode.c:1875 [inline] iput fs/inode.c:1901 [inline] iput+0x530/0x890 fs/inode.c:1887 do_unlinkat+0x5c3/0x760 fs/namei.c:4540 __do_sys_unlink fs/namei.c:4581 [inline] __se_sys_unlink fs/namei.c:4579 [inline] __ia32_sys_unlink+0xc4/0x110 fs/namei.c:4579 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 ffff888022896880 which belongs to the cache shmem_inode_cache of size 1544 The buggy address is located 1224 bytes inside of freed 1544-byte region [ffff888022896880, ffff888022896e88) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22890 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: f5(slab) raw: 00fff00000000040 ffff888040489b80 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000130013 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff888040489b80 dead000000000122 0000000000000000 head: 0000000000000000 0000000000130013 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea00008a2401 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 5518827873, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x101e/0x3070 mm/page_alloc.c:3457 __alloc_pages_noprof+0x223/0x25c0 mm/page_alloc.c:4733 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 alloc_slab_page mm/slub.c:2412 [inline] allocate_slab mm/slub.c:2578 [inline] new_slab+0x2ba/0x3f0 mm/slub.c:2631 ___slab_alloc+0xd1d/0x16f0 mm/slub.c:3818 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] kmem_cache_alloc_lru_noprof+0x2a7/0x2f0 mm/slub.c:4153 shmem_alloc_inode+0x25/0x50 mm/shmem.c:4769 alloc_inode+0x5d/0x230 fs/inode.c:263 new_inode_pseudo fs/inode.c:1102 [inline] new_inode+0x22/0x210 fs/inode.c:1121 __shmem_get_inode mm/shmem.c:2806 [inline] shmem_get_inode+0x194/0xea0 mm/shmem.c:2877 shmem_mknod+0x66/0x240 mm/shmem.c:3573 vfs_mknod+0x5d7/0x8e0 fs/namei.c:4135 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: ffff888022896c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022896c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888022896d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888022896d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888022896e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================