================================================================== BUG: KASAN: slab-out-of-bounds in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: slab-out-of-bounds in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: slab-out-of-bounds in buffer_busy fs/buffer.c:2784 [inline] BUG: KASAN: slab-out-of-bounds in drop_buffers+0x65/0x6a0 fs/buffer.c:2796 Read of size 4 at addr ffff88807e608060 by task kswapd0/83 CPU: 1 PID: 83 Comm: kswapd0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x235/0x290 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] buffer_busy fs/buffer.c:2784 [inline] drop_buffers+0x65/0x6a0 fs/buffer.c:2796 try_to_free_buffers+0x230/0x560 fs/buffer.c:2830 shrink_folio_list+0x2127/0x7aa0 mm/vmscan.c:2003 evict_folios+0xa80/0x22a0 mm/vmscan.c:5046 lru_gen_shrink_lruvec mm/vmscan.c:5229 [inline] shrink_lruvec+0xc90/0x3d50 mm/vmscan.c:5924 Allocated by task 12064: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb0/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] kzalloc include/linux/slab.h:699 [inline] iomap_page_create+0x14a/0x600 fs/iomap/buffered-io.c:61 iomap_readpage_iter+0x240/0x8f0 fs/iomap/buffered-io.c:273 iomap_read_folio+0x332/0x8c0 fs/iomap/buffered-io.c:344 filemap_read_folio+0x16b/0x770 mm/filemap.c:2490 do_read_cache_folio+0x2a0/0x760 mm/filemap.c:3659 erofs_bread+0x18e/0x670 fs/erofs/data.c:50 erofs_find_target_block fs/erofs/namei.c:102 [inline] erofs_namei+0x29c/0xf50 fs/erofs/namei.c:175 erofs_lookup+0x14b/0x390 fs/erofs/namei.c:204 __lookup_slow+0x29d/0x3f0 fs/namei.c:1698 lookup_slow+0x53/0x70 fs/namei.c:1715 walk_component fs/namei.c:2006 [inline] link_path_walk+0x945/0xe70 fs/namei.c:2333 path_parentat fs/namei.c:2534 [inline] __filename_parentat+0x226/0x650 fs/namei.c:2558 filename_parentat fs/namei.c:2576 [inline] filename_create+0xd5/0x470 fs/namei.c:3865 do_mkdirat+0xa5/0x440 fs/namei.c:4129 __do_sys_mkdirat fs/namei.c:4154 [inline] __se_sys_mkdirat fs/namei.c:4152 [inline] __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4152 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 kvfree_call_rcu+0x103/0x870 kernel/rcu/tree.c:3405 cfg80211_update_known_bss+0x178/0xa20 net/wireless/scan.c:-1 cfg80211_bss_update+0x15f/0x2250 net/wireless/scan.c:1853 cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2512 [inline] cfg80211_inform_bss_frame_data+0x9ec/0x1390 net/wireless/scan.c:2545 ieee80211_bss_info_update+0x738/0xc80 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x189d/0x2cd0 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1679 [inline] ieee80211_iface_work+0x726/0xc80 net/mac80211/iface.c:1733 cfg80211_wiphy_work+0x221/0x260 net/wireless/core.c:433 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88807e608000 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes to the right of 96-byte region [ffff88807e608000, ffff88807e608060) The buggy address belongs to the physical page: page:ffffea0001f98200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e608 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000094a940 dead000000000006 ffff888017441780 raw: 0000000000000000 0000000000200020 00000001ffffffff 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 0x12c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (init), ts 21354319411, free_ts 20769818900 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5657 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa0/0x240 mm/slab_common.c:949 kmalloc_array include/linux/slab.h:615 [inline] kcalloc include/linux/slab.h:646 [inline] ext4_find_extent+0x367/0xe00 fs/ext4/extents.c:914 ext4_ext_map_blocks+0x29e/0x6810 fs/ext4/extents.c:4172 ext4_map_blocks+0x3a8/0x1b70 fs/ext4/inode.c:606 ext4_mpage_readpages+0xb07/0x2e70 fs/ext4/readpage.c:305 read_pages+0x185/0x850 mm/readahead.c:161 page_cache_ra_unbounded+0x690/0x770 mm/readahead.c:270 page_cache_sync_readahead include/linux/pagemap.h:1250 [inline] filemap_get_pages mm/filemap.c:2665 [inline] filemap_read+0x646/0x3020 mm/filemap.c:2759 generic_file_read_iter+0x136/0x740 mm/filemap.c:2941 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3508 kasan_depopulate_vmalloc_pte+0x67/0x80 mm/kasan/shadow.c:375 apply_to_pte_range mm/memory.c:2660 [inline] apply_to_pmd_range mm/memory.c:2704 [inline] apply_to_pud_range mm/memory.c:2740 [inline] apply_to_p4d_range mm/memory.c:2776 [inline] __apply_to_page_range+0x989/0xd10 mm/memory.c:2812 kasan_release_vmalloc+0x93/0xb0 mm/kasan/shadow.c:492 __purge_vmap_area_lazy+0xf7e/0x1920 mm/vmalloc.c:1782 _vm_unmap_aliases+0x456/0x4c0 mm/vmalloc.c:2185 change_page_attr_set_clr+0x320/0xa70 arch/x86/mm/pat/set_memory.c:1821 change_page_attr_set arch/x86/mm/pat/set_memory.c:1871 [inline] set_memory_nx+0xd3/0x110 arch/x86/mm/pat/set_memory.c:2064 free_init_pages arch/x86/mm/init.c:943 [inline] free_kernel_image_pages arch/x86/mm/init.c:962 [inline] free_initmem+0x8e/0xd0 arch/x86/mm/init.c:989 kernel_init+0x2d/0x1b0 init/main.c:1535 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88807e607f00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff88807e607f80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88807e608000: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff88807e608080: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff88807e608100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================