EXT4-fs (loop2): mounted filesystem without journal. Opts: block_validity,errors=remount-ro,sysvgroups,norecovery,debug_want_extra_isize=0x0000000000000080,grpjquota=,nogrpid,noauto_da_alloc,norecovery,
==================================================================
BUG: KASAN: use-after-free in xattr_find_entry fs/ext4/xattr.c:294 [inline]
BUG: KASAN: use-after-free in ext4_xattr_ibody_get+0x606/0x670 fs/ext4/xattr.c:601
Read of size 4 at addr ffff888112050004 by task syz.2.22/415

CPU: 0 PID: 415 Comm: syz.2.22 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
Call Trace:
 __dump_stack+0x21/0x24 lib/dump_stack.c:77
 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x100/0x140 mm/kasan/report.c:452
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 xattr_find_entry fs/ext4/xattr.c:294 [inline]
 ext4_xattr_ibody_get+0x606/0x670 fs/ext4/xattr.c:601
 ext4_xattr_get+0x116/0x830 fs/ext4/xattr.c:655
 ext4_get_acl+0x6c/0x6b0 fs/ext4/acl.c:162
 get_acl+0x15f/0x270 fs/posix_acl.c:141
 posix_acl_chmod+0xe1/0x240 fs/posix_acl.c:565
 ext4_setattr+0xb65/0x1980 fs/ext4/inode.c:5741
 notify_change+0xab5/0xe40 fs/attr.c:410
 chmod_common+0x1e4/0x390 fs/open.c:584
 do_fchmodat+0xd4/0x1a0 fs/open.c:622
 __do_sys_fchmodat fs/open.c:635 [inline]
 __se_sys_fchmodat fs/open.c:632 [inline]
 __x64_sys_fchmodat+0x7b/0x90 fs/open.c:632
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f6c7fb46e99
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:00007ffde4d7bec8 EFLAGS: 00000246 ORIG_RAX: 000000000000010c
RAX: ffffffffffffffda RBX: 00007f6c7fdcefa0 RCX: 00007f6c7fb46e99
RDX: 00000000ffffff50 RSI: 0000200000000300 RDI: ffffffffffffff9c
RBP: 00007f6c7fbdceaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c7fdcefac R14: 00007f6c7fdcefa0 R15: 00007f6c7fdcefa0

Allocated by task 7:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:430 [inline]
 __kasan_slab_alloc+0xb7/0xe0 mm/kasan/common.c:463
 kasan_slab_alloc include/linux/kasan.h:244 [inline]
 slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580
 slab_alloc_node mm/slub.c:2952 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x15a/0x2d0 mm/slub.c:2965
 kmem_cache_alloc_node include/linux/slab.h:426 [inline]
 __alloc_skb+0x9e/0x520 net/core/skbuff.c:200
 alloc_skb include/linux/skbuff.h:1126 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 rtmsg_fib+0x5fe/0xd90 net/ipv4/fib_semantics.c:520
 fib_table_delete+0xd60/0xfe0 net/ipv4/fib_trie.c:1695
 fib_magic net/ipv4/fib_frontend.c:1109 [inline]
 fib_del_ifaddr+0x16fb/0x1c80 net/ipv4/fib_frontend.c:1322
 fib_inetaddr_event+0xc9/0x310 net/ipv4/fib_frontend.c:1453
 notifier_call_chain kernel/notifier.c:83 [inline]
 blocking_notifier_call_chain+0xba/0x140 kernel/notifier.c:337
 __inet_del_ifa+0x81f/0xd90 net/ipv4/devinet.c:442
 inet_del_ifa net/ipv4/devinet.c:479 [inline]
 inetdev_destroy net/ipv4/devinet.c:320 [inline]
 inetdev_event+0x646/0x1010 net/ipv4/devinet.c:1612
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410
 call_netdevice_notifiers_info net/core/dev.c:2052 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
 call_netdevice_notifiers net/core/dev.c:2078 [inline]
 unregister_netdevice_many+0x100e/0x19f0 net/core/dev.c:10778
 ip_tunnel_delete_nets+0x343/0x390 net/ipv4/ip_tunnel.c:1122
 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1713
 ops_exit_list net/core/net_namespace.c:190 [inline]
 cleanup_net+0x5fe/0xb80 net/core/net_namespace.c:609
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Freed by task 7:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:362
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370
 kasan_slab_free include/linux/kasan.h:220 [inline]
 slab_free_hook mm/slub.c:1600 [inline]
 slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626
 slab_free mm/slub.c:3208 [inline]
 kmem_cache_free+0x100/0x2d0 mm/slub.c:3224
 kfree_skbmem+0x10c/0x180 net/core/skbuff.c:-1
 __kfree_skb net/core/skbuff.c:695 [inline]
 consume_skb+0xb3/0x1f0 net/core/skbuff.c:851
 netlink_broadcast_filtered+0x11ce/0x12c0 net/netlink/af_netlink.c:1535
 netlink_broadcast net/netlink/af_netlink.c:1557 [inline]
 nlmsg_multicast include/net/netlink.h:1033 [inline]
 nlmsg_notify+0xe9/0x1a0 net/netlink/af_netlink.c:2551
 rtnl_notify+0x9a/0xc0 net/core/rtnetlink.c:740
 rtmsg_fib+0x781/0xd90 net/ipv4/fib_semantics.c:539
 fib_table_delete+0xd60/0xfe0 net/ipv4/fib_trie.c:1695
 fib_magic net/ipv4/fib_frontend.c:1109 [inline]
 fib_del_ifaddr+0x16fb/0x1c80 net/ipv4/fib_frontend.c:1322
 fib_inetaddr_event+0xc9/0x310 net/ipv4/fib_frontend.c:1453
 notifier_call_chain kernel/notifier.c:83 [inline]
 blocking_notifier_call_chain+0xba/0x140 kernel/notifier.c:337
 __inet_del_ifa+0x81f/0xd90 net/ipv4/devinet.c:442
 inet_del_ifa net/ipv4/devinet.c:479 [inline]
 inetdev_destroy net/ipv4/devinet.c:320 [inline]
 inetdev_event+0x646/0x1010 net/ipv4/devinet.c:1612
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0x90/0x100 kernel/notifier.c:410
 call_netdevice_notifiers_info net/core/dev.c:2052 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
 call_netdevice_notifiers net/core/dev.c:2078 [inline]
 unregister_netdevice_many+0x100e/0x19f0 net/core/dev.c:10778
 ip_tunnel_delete_nets+0x343/0x390 net/ipv4/ip_tunnel.c:1122
 ipgre_tap_exit_batch_net+0x22/0x30 net/ipv4/ip_gre.c:1713
 ops_exit_list net/core/net_namespace.c:190 [inline]
 cleanup_net+0x5fe/0xb80 net/core/net_namespace.c:609
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff888112050000
 which belongs to the cache skbuff_head_cache of size 248
The buggy address is located 4 bytes inside of
 248-byte region [ffff888112050000, ffff8881120500f8)
The buggy address belongs to the page:
page:ffffea0004481400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112050
flags: 0x4000000000000200(slab)
raw: 4000000000000200 dead000000000100 dead000000000122 ffff888107d93c80
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 109, ts 4777825708, free_ts 0
 set_page_owner include/linux/page_owner.h:35 [inline]
 post_alloc_hook mm/page_alloc.c:2456 [inline]
 prep_new_page+0x176/0x190 mm/page_alloc.c:2462
 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254
 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1813 [inline]
 new_slab+0x84/0x3f0 mm/slub.c:1874
 new_slab_objects mm/slub.c:2632 [inline]
 ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796
 __slab_alloc+0x63/0xa0 mm/slub.c:2836
 slab_alloc_node mm/slub.c:2918 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc+0x1a4/0x2d0 mm/slub.c:2965
 skb_clone+0x1cd/0x370 net/core/skbuff.c:1467
 do_one_broadcast net/netlink/af_netlink.c:1453 [inline]
 netlink_broadcast_filtered+0x66e/0x12c0 net/netlink/af_netlink.c:1533
 netlink_broadcast+0x3a/0x50 net/netlink/af_netlink.c:1557
 uevent_net_broadcast_untagged lib/kobject_uevent.c:331 [inline]
 kobject_uevent_net_broadcast+0x3bd/0x5a0 lib/kobject_uevent.c:409
 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608
 kobject_synth_uevent+0x452/0x940 lib/kobject_uevent.c:208
 uevent_store+0x25/0x60 drivers/base/core.c:2320
 dev_attr_store+0x5e/0x80 drivers/base/core.c:2018
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811204ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811204ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888112050000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888112050080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc
 ffff888112050100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
EXT4-fs error (device loop2): xattr_find_entry:297: inode #12: comm syz.2.22: corrupted xattr entries
EXT4-fs (loop2): Remounting filesystem read-only