loop3: rw=0, sector=6491536, nr_sectors = 2 limit=128
Buffer I/O error on dev loop3, logical block 3245768, async page read
==================================================================
BUG: KASAN: use-after-free in sysv_new_inode+0xf09/0x10a0 fs/sysv/ialloc.c:153
Read of size 2 at addr ffff88806affe1ce by task syz.3.16/3080

CPU: 0 PID: 3080 Comm: syz.3.16 Not tainted 6.1.147-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xdc/0x15b lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x200 mm/kasan/report.c:418
 kasan_report+0x10b/0x140 mm/kasan/report.c:522
 sysv_new_inode+0xf09/0x10a0 fs/sysv/ialloc.c:153
 sysv_symlink+0x83/0x110 fs/sysv/namei.c:80
 vfs_symlink+0x202/0x3a0 fs/namei.c:4471
 do_symlinkat+0x185/0x390 fs/namei.c:4500
 __do_sys_symlink fs/namei.c:4522 [inline]
 __se_sys_symlink fs/namei.c:4520 [inline]
 __x64_sys_symlink+0x75/0x80 fs/namei.c:4520
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fabebf8cda9
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:00007fabecec7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007fabec1a5fa0 RCX: 00007fabebf8cda9
RDX: 0000000000000000 RSI: 000000002000acc0 RDI: 000000002000ad80
RBP: 00007fabec00e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fabec1a5fa0 R15: 00007fff08e1a018
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001abff80 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x6affe
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea00019018c8 ffffea0001900348 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 2795, tgid 2795 (modprobe), ts 80998239561, free_ts 81007766551
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x257/0x280 mm/page_alloc.c:2532
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x2ce1/0x2e20 mm/page_alloc.c:4328
 __alloc_pages+0x1df/0x420 mm/page_alloc.c:5614
 __folio_alloc+0xe/0x30 mm/page_alloc.c:5646
 vma_alloc_folio+0x482/0x9d0 mm/mempolicy.c:2243
 alloc_page_vma include/linux/gfp.h:284 [inline]
 do_cow_fault mm/memory.c:4650 [inline]
 do_fault mm/memory.c:4762 [inline]
 handle_pte_fault mm/memory.c:5031 [inline]
 __handle_mm_fault mm/memory.c:5173 [inline]
 handle_mm_fault+0x18da/0x3470 mm/memory.c:5294
 do_user_addr_fault+0x2ff/0x6e0 arch/x86/mm/fault.c:1340
 handle_page_fault arch/x86/mm/fault.c:1431 [inline]
 exc_page_fault+0x4e/0xb0 arch/x86/mm/fault.c:1487
 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x821/0x8f0 mm/page_alloc.c:3384
 free_unref_page_list+0xb8/0x810 mm/page_alloc.c:3525
 release_pages+0x1447/0x15d0 mm/swap.c:1035
 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
 tlb_flush_mmu+0xe8/0x1d0 mm/mmu_gather.c:261
 tlb_finish_mmu+0xa4/0x180 mm/mmu_gather.c:361
 exit_mmap+0x2bf/0x650 mm/mmap.c:3258
 __mmput+0x9d/0x2d0 kernel/fork.c:1200
 exit_mm+0x12a/0x1b0 kernel/exit.c:565
 do_exit+0x66b/0x1f50 kernel/exit.c:867
 do_group_exit+0x1ac/0x270 kernel/exit.c:1022
 __do_sys_exit_group kernel/exit.c:1033 [inline]
 __se_sys_exit_group kernel/exit.c:1031 [inline]
 __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88806affe080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806affe100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88806affe180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                              ^
 ffff88806affe200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806affe280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================