loop4: detected capacity change from 0 to 1024 EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1783 Read of size 18446744073709551588 at addr ffff8880784b6840 by task syz.4.3841/16423 CPU: 1 UID: 0 PID: 16423 Comm: syz.4.3841 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/27/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1783 ext4_xattr_block_set+0x878/0x2ad0 fs/ext4/xattr.c:2030 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559 __vfs_setxattr+0x43c/0x480 fs/xattr.c:218 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252 vfs_setxattr+0x163/0x360 fs/xattr.c:339 do_setxattr fs/xattr.c:654 [inline] filename_setxattr+0x296/0x630 fs/xattr.c:682 path_setxattrat+0x3eb/0x440 fs/xattr.c:726 __do_sys_setxattr fs/xattr.c:760 [inline] __se_sys_setxattr fs/xattr.c:756 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:756 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff9ec79c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff9ed63f028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007ff9eca15fa0 RCX: 00007ff9ec79c799 RDX: 00002000000013c0 RSI: 0000200000000140 RDI: 0000200000000100 RBP: 00007ff9ec832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff9eca16038 R14: 00007ff9eca15fa0 R15: 00007ffeff92a428 Allocated by task 16423: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5256 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5364 kmemdup_noprof+0x2b/0x70 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:763 [inline] ext4_xattr_block_set+0x787/0x2ad0 fs/ext4/xattr.c:1978 ext4_xattr_set_handle+0xe34/0x14c0 fs/ext4/xattr.c:2457 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559 __vfs_setxattr+0x43c/0x480 fs/xattr.c:218 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252 vfs_setxattr+0x163/0x360 fs/xattr.c:339 do_setxattr fs/xattr.c:654 [inline] filename_setxattr+0x296/0x630 fs/xattr.c:682 path_setxattrat+0x3eb/0x440 fs/xattr.c:726 __do_sys_setxattr fs/xattr.c:760 [inline] __se_sys_setxattr fs/xattr.c:756 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:756 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880784b6800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff8880784b6800, ffff8880784b6c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x784b0 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 ffff88801b041dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801b041dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000 head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 48, tgid 48 (kworker/u8:3), ts 92683751001, free_ts 92627795206 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1857 prep_new_page mm/page_alloc.c:1865 [inline] get_page_from_freelist+0x2418/0x24b0 mm/page_alloc.c:3924 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5211 alloc_slab_page mm/slub.c:3289 [inline] allocate_slab+0x77/0x660 mm/slub.c:3478 new_slab mm/slub.c:3536 [inline] refill_objects+0x331/0x3c0 mm/slub.c:7171 __pcs_replace_empty_main+0x2f9/0x5e0 mm/slub.c:-1 alloc_from_pcs mm/slub.c:4713 [inline] slab_alloc_node mm/slub.c:4847 [inline] __do_kmalloc_node mm/slub.c:5255 [inline] __kmalloc_noprof+0x474/0x760 mm/slub.c:5268 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] ieee802_11_parse_elems_full+0x159/0x2ab0 net/mac80211/parse.c:1051 ieee802_11_parse_elems net/mac80211/ieee80211_i.h:2486 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1563 [inline] ieee80211_ibss_rx_queued_mgmt+0x4ca/0x2cd0 net/mac80211/ibss.c:1594 ieee80211_iface_process_skb net/mac80211/iface.c:1751 [inline] ieee80211_iface_work+0x845/0x1380 net/mac80211/iface.c:1805 cfg80211_wiphy_work+0x2ab/0x4a0 net/wireless/core.c:439 process_one_work+0x9a5/0x1760 kernel/workqueue.c:3289 process_scheduled_works kernel/workqueue.c:3380 [inline] worker_thread+0xb49/0x1140 kernel/workqueue.c:3461 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page last free pid 6282 tgid 6282 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1401 [inline] __free_frozen_pages+0xbf0/0xd00 mm/page_alloc.c:2942 __slab_free+0x263/0x2b0 mm/slub.c:5569 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4535 [inline] slab_alloc_node mm/slub.c:4862 [inline] kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4869 new_handle fs/jbd2/transaction.c:457 [inline] jbd2__journal_start+0x145/0x5b0 fs/jbd2/transaction.c:484 __ext4_journal_start_sb+0x203/0x620 fs/ext4/ext4_jbd2.c:114 __ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline] ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6450 __mark_inode_dirty+0x3a4/0x1470 fs/fs-writeback.c:2609 generic_update_time fs/inode.c:2198 [inline] file_update_time_flags+0x3ee/0x4a0 fs/inode.c:2428 ext4_page_mkwrite+0x224/0x1150 fs/ext4/inode.c:6619 do_page_mkwrite+0x14d/0x310 mm/memory.c:3583 do_shared_fault mm/memory.c:5863 [inline] do_fault mm/memory.c:5925 [inline] do_pte_missing+0x6da/0x34f0 mm/memory.c:4465 handle_pte_fault mm/memory.c:6305 [inline] __handle_mm_fault mm/memory.c:6443 [inline] handle_mm_fault+0x1bd7/0x3170 mm/memory.c:6612 do_user_addr_fault+0xa73/0x1340 arch/x86/mm/fault.c:1334 Memory state around the buggy address: ffff8880784b6700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880784b6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880784b6800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880784b6880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880784b6900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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