loop1: detected capacity change from 0 to 1024 EXT4-fs (loop1): 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:1782 Read of size 18446744073709551588 at addr ffff888028504840 by task syz.1.968/10684 CPU: 1 UID: 0 PID: 10684 Comm: syz.1.968 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1782 ext4_xattr_block_set+0x872/0x2ac0 fs/ext4/xattr.c:2029 ext4_xattr_set_handle+0xdfb/0x1590 fs/ext4/xattr.c:2456 ext4_xattr_set+0x230/0x320 fs/ext4/xattr.c:2558 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x274/0x600 fs/xattr.c:665 path_setxattrat+0x364/0x3a0 fs/xattr.c:713 __do_sys_setxattr fs/xattr.c:747 [inline] __se_sys_setxattr fs/xattr.c:743 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:743 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2144b8f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2145a67038 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc RAX: ffffffffffffffda RBX: 00007f2144de5fa0 RCX: 00007f2144b8f749 RDX: 00002000000013c0 RSI: 0000200000000140 RDI: 0000200000000100 RBP: 00007f2144c13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000700 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f2144de6038 R14: 00007f2144de5fa0 R15: 00007fffabf387c8 Allocated by task 10684: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_node_track_caller_noprof+0x575/0x820 mm/slub.c:5764 kmemdup_noprof+0x2b/0x70 mm/util.c:138 kmemdup_noprof include/linux/fortify-string.h:765 [inline] ext4_xattr_block_set+0x781/0x2ac0 fs/ext4/xattr.c:1977 ext4_xattr_set_handle+0xdfb/0x1590 fs/ext4/xattr.c:2456 ext4_xattr_set+0x230/0x320 fs/ext4/xattr.c:2558 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234 vfs_setxattr+0x16b/0x2f0 fs/xattr.c:321 do_setxattr fs/xattr.c:636 [inline] filename_setxattr+0x274/0x600 fs/xattr.c:665 path_setxattrat+0x364/0x3a0 fs/xattr.c:713 __do_sys_setxattr fs/xattr.c:747 [inline] __se_sys_setxattr fs/xattr.c:743 [inline] __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:743 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888028504800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 64 bytes inside of 1024-byte region [ffff888028504800, ffff888028504c00) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28500 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 ffff88813ffa6dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88813ffa6dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0000a14001 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 1003, tgid 1003 (kworker/u8:6), ts 17278894795, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_slab_page mm/slub.c:3077 [inline] allocate_slab+0x7a/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xf2b/0x1960 mm/slub.c:4656 __slab_alloc+0x65/0x100 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __kmalloc_cache_node_noprof+0x4b3/0x700 mm/slub.c:5784 kmalloc_node_noprof include/linux/slab.h:983 [inline] blk_mq_alloc_hctx block/blk-mq.c:4023 [inline] blk_mq_alloc_and_init_hctx+0x17e/0xc50 block/blk-mq.c:4519 __blk_mq_realloc_hw_ctxs+0x293/0x640 block/blk-mq.c:4571 blk_mq_realloc_hw_ctxs block/blk-mq.c:4608 [inline] blk_mq_init_allocated_queue+0x356/0x1350 block/blk-mq.c:4638 blk_mq_alloc_queue+0x191/0x280 block/blk-mq.c:4419 scsi_alloc_sdev+0x770/0xb90 drivers/scsi/scsi_scan.c:339 scsi_probe_and_add_lun+0x1cf/0x45f0 drivers/scsi/scsi_scan.c:1218 __scsi_scan_target+0x1dd/0xd10 drivers/scsi/scsi_scan.c:1789 scsi_scan_channel drivers/scsi/scsi_scan.c:1877 [inline] scsi_scan_host_selected+0x372/0x690 drivers/scsi/scsi_scan.c:1906 do_scsi_scan_host drivers/scsi/scsi_scan.c:2045 [inline] do_scan_async+0x124/0x760 drivers/scsi/scsi_scan.c:2055 page_owner free stack trace missing Memory state around the buggy address: ffff888028504700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888028504780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888028504800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888028504880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888028504900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================