loop1: detected capacity change from 0 to 1024 EXT4-fs: Ignoring removed mblk_io_submit option EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. ================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x1a71/0x21d0 fs/ext4/xattr.c:1687 Read of size 18446744073709550592 at addr ffff88813b6c4c00 by task syz.1.349/1509 CPU: 0 PID: 1509 Comm: syz.1.349 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x71/0x200 mm/kasan/report.c:316 print_report+0x4a/0x60 mm/kasan/report.c:420 kasan_report+0x122/0x150 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x249/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_xattr_set_entry+0x1a71/0x21d0 fs/ext4/xattr.c:1687 ext4_xattr_block_set+0xad3/0x3260 fs/ext4/xattr.c:1977 ext4_xattr_set_handle+0xe3b/0x1570 fs/ext4/xattr.c:2399 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2501 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3f2/0x440 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x167/0x2e0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:655 x64_sys_call+0x8b7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190 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 RIP: 0033:0x7fc51379c819 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:00007fc51456e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd RAX: ffffffffffffffda RBX: 00007fc513a15fa0 RCX: 00007fc51379c819 RDX: 0000200000000380 RSI: 0000200000000100 RDI: 0000200000000040 RBP: 00007fc513832c91 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fe37 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc513a16038 R14: 00007fc513a15fa0 R15: 00007ffe3cb5f4a8 Allocated by task 1509: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:380 [inline] __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:938 [inline] __kmalloc_node_track_caller+0xb1/0x1e0 mm/slab_common.c:958 kmemdup+0x2b/0x60 mm/util.c:134 kmemdup include/linux/fortify-string.h:585 [inline] ext4_xattr_block_set+0x9d5/0x3260 fs/ext4/xattr.c:1925 ext4_xattr_set_handle+0xe3b/0x1570 fs/ext4/xattr.c:2399 ext4_xattr_set+0x242/0x320 fs/ext4/xattr.c:2501 ext4_xattr_trusted_set+0x3c/0x50 fs/ext4/xattr_trusted.c:38 __vfs_setxattr+0x3f2/0x440 fs/xattr.c:182 __vfs_setxattr_noperm+0x12a/0x5e0 fs/xattr.c:216 __vfs_setxattr_locked+0x212/0x230 fs/xattr.c:277 vfs_setxattr+0x167/0x2e0 fs/xattr.c:309 do_setxattr fs/xattr.c:594 [inline] setxattr+0x346/0x360 fs/xattr.c:617 path_setxattr+0x147/0x290 fs/xattr.c:636 __do_sys_lsetxattr fs/xattr.c:659 [inline] __se_sys_lsetxattr fs/xattr.c:655 [inline] __x64_sys_lsetxattr+0xc2/0xe0 fs/xattr.c:655 x64_sys_call+0x8b7/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:190 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 The buggy address belongs to the object at ffff88813b6c4800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 0 bytes to the right of 1024-byte region [ffff88813b6c4800, ffff88813b6c4c00) The buggy address belongs to the physical page: page:ffffea0004edb000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13b6c0 head:ffffea0004edb000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043080 raw: 0000000000000000 0000000080100010 00000001ffffffff 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1223, tgid 1223 (syz-executor), ts 71347827435, free_ts 71347385893 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2670 prep_new_page+0x1c/0x110 mm/page_alloc.c:2677 get_page_from_freelist+0x2d12/0x2d80 mm/page_alloc.c:4583 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5924 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1 allocate_slab mm/slub.c:1967 [inline] new_slab+0x98/0x3d0 mm/slub.c:2020 ___slab_alloc+0x6bd/0xb20 mm/slub.c:3177 __slab_alloc+0x5e/0xa0 mm/slub.c:3263 slab_alloc_node mm/slub.c:3348 [inline] __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3423 __do_kmalloc_node mm/slab_common.c:937 [inline] __kmalloc_node_track_caller+0xa0/0x1e0 mm/slab_common.c:958 kmalloc_reserve net/core/skbuff.c:449 [inline] pskb_expand_head+0x1b0/0x1210 net/core/skbuff.c:1851 __skb_unclone_keeptruesize+0x85/0x260 net/core/skbuff.c:1950 skb_unclone_keeptruesize include/linux/skbuff.h:1958 [inline] tcp_trim_head+0xf6/0x680 net/ipv4/tcp_output.c:1674 tcp_tso_acked net/ipv4/tcp_input.c:3285 [inline] tcp_clean_rtx_queue net/ipv4/tcp_input.c:3351 [inline] tcp_ack+0x1889/0x5df0 net/ipv4/tcp_input.c:3974 tcp_rcv_established+0xe76/0x1a50 net/ipv4/tcp_input.c:6027 tcp_v4_do_rcv+0x446/0xa10 net/ipv4/tcp_ipv4.c:1683 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1578 [inline] free_pcp_prepare mm/page_alloc.c:1652 [inline] free_unref_page_prepare+0x742/0x750 mm/page_alloc.c:3618 free_unref_page+0x95/0x540 mm/page_alloc.c:3716 free_the_page mm/page_alloc.c:863 [inline] free_compound_page+0x99/0xd0 mm/page_alloc.c:886 destroy_large_folio+0x68/0xa0 mm/page_alloc.c:923 __folio_put_large mm/swap.c:113 [inline] __folio_put+0xd1/0xe0 mm/swap.c:121 folio_put include/linux/mm.h:1442 [inline] put_page include/linux/mm.h:1494 [inline] __skb_frag_unref include/linux/skbuff.h:3510 [inline] skb_release_data+0x47f/0x890 net/core/skbuff.c:788 skb_release_all net/core/skbuff.c:859 [inline] __kfree_skb net/core/skbuff.c:873 [inline] consume_skb+0xab/0x1f0 net/core/skbuff.c:1038 __dev_kfree_skb_any+0x12f/0x150 net/core/dev.c:3231 dev_consume_skb_any include/linux/netdevice.h:3898 [inline] napi_consume_skb+0x15d/0x2c0 net/core/skbuff.c:1098 free_old_xmit_skbs+0x10e/0x280 drivers/net/virtio_net.c:1639 start_xmit+0x172/0x15e0 drivers/net/virtio_net.c:1901 __netdev_start_xmit include/linux/netdevice.h:4930 [inline] netdev_start_xmit include/linux/netdevice.h:4944 [inline] xmit_one net/core/dev.c:3694 [inline] dev_hard_start_xmit+0x20b/0x750 net/core/dev.c:3710 sch_direct_xmit+0x27a/0x900 net/sched/sch_generic.c:345 __dev_xmit_skb net/core/dev.c:3931 [inline] __dev_queue_xmit+0x1638/0x3470 net/core/dev.c:4336 dev_queue_xmit include/linux/netdevice.h:3085 [inline] neigh_hh_output include/net/neighbour.h:536 [inline] neigh_output include/net/neighbour.h:550 [inline] ip_finish_output2+0xb1f/0xf10 net/ipv4/ip_output.c:228 __ip_finish_output+0x172/0x370 net/ipv4/ip_output.c:-1 Memory state around the buggy address: ffff88813b6c4b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88813b6c4b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88813b6c4c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88813b6c4c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88813b6c4d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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