loop3: detected capacity change from 0 to 128
VFS: Found a Xenix FS (block size = 1024) on device loop3
syz.3.22: attempt to access beyond end of device
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: slab-out-of-bounds in sysv_new_inode+0xfc7/0x1160 fs/sysv/ialloc.c:153
Read of size 2 at addr ffff8880764ac1ce by task syz.3.22/5758

CPU: 0 UID: 0 PID: 5758 Comm: syz.3.22 Not tainted 6.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 sysv_new_inode+0xfc7/0x1160 fs/sysv/ialloc.c:153
 sysv_symlink+0x9f/0x180 fs/sysv/namei.c:80
 vfs_symlink+0x137/0x2e0 fs/namei.c:4615
 do_symlinkat+0x222/0x3a0 fs/namei.c:4641
 __do_sys_symlink fs/namei.c:4662 [inline]
 __se_sys_symlink fs/namei.c:4660 [inline]
 __x64_sys_symlink+0x7a/0x90 fs/namei.c:4660
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9ba3d7dff9
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:00007f9ba4c23038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 00007f9ba3f35f80 RCX: 00007f9ba3d7dff9
RDX: 0000000000000000 RSI: 00000000200059c0 RDI: 00000000200049c0
RBP: 00007f9ba3df0296 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9ba3f35f80 R15: 00007ffc19fa3c28
 </TASK>

Allocated by task 2967:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x7d/0x90 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __kmalloc_cache_noprof+0x197/0x280 mm/slub.c:4295
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 mca_alloc net/ipv6/mcast.c:881 [inline]
 __ipv6_dev_mc_inc+0x429/0xa90 net/ipv6/mcast.c:937
 addrconf_join_solict net/ipv6/addrconf.c:2241 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:4104 [inline]
 addrconf_dad_work+0x448/0x16f0 net/ipv6/addrconf.c:4229
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1840 kernel/workqueue.c:3310
 worker_thread+0xa2b/0xf70 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff8880764ac000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 174 bytes to the right of
 allocated 288-byte region [ffff8880764ac000, ffff8880764ac120)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x764ac
head: order:2 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 ffff88801a041c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041c80 dead000000000122 0000000000000000
head: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000
head: 00fff00000000002 ffffea0001d92b01 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2967, tgid 2967 (kworker/u8:8), ts 98224162826, free_ts 98157933647
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1ee/0x220 mm/page_alloc.c:1537
 prep_new_page mm/page_alloc.c:1545 [inline]
 get_page_from_freelist+0x3a55/0x3cc0 mm/page_alloc.c:3457
 __alloc_pages_noprof+0x261/0x6a0 mm/page_alloc.c:4733
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x120 mm/slub.c:2412
 allocate_slab+0x5a/0x2e0 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0xcd8/0x14b0 mm/slub.c:3818
 __slab_alloc+0x58/0xa0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __kmalloc_cache_noprof+0x1d0/0x280 mm/slub.c:4290
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 mca_alloc net/ipv6/mcast.c:881 [inline]
 __ipv6_dev_mc_inc+0x429/0xa90 net/ipv6/mcast.c:937
 addrconf_join_solict net/ipv6/addrconf.c:2241 [inline]
 addrconf_dad_begin net/ipv6/addrconf.c:4104 [inline]
 addrconf_dad_work+0x448/0x16f0 net/ipv6/addrconf.c:4229
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1840 kernel/workqueue.c:3310
 worker_thread+0xa2b/0xf70 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 35 tgid 35 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1108 [inline]
 free_unref_page+0xcc2/0xed0 mm/page_alloc.c:2638
 __folio_put+0x2c7/0x440 mm/swap.c:126
 folio_put include/linux/mm.h:1478 [inline]
 free_large_kmalloc+0x103/0x1c0 mm/slub.c:4698
 kfree+0x1fb/0x410 mm/slub.c:4721
 ops_free_list+0x2c3/0x370 net/core/net_namespace.c:188
 cleanup_net+0x902/0xcb0 net/core/net_namespace.c:630
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1840 kernel/workqueue.c:3310
 worker_thread+0xa2b/0xf70 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff8880764ac080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880764ac100: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880764ac180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                              ^
 ffff8880764ac200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880764ac280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================