BUG: spinlock bad magic in skb_queue_tail

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: aba5b397cad7 hamradio: baycom_epp: Do not use x86-specific..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=137be5f7880000
kernel config: https://syzkaller.appspot.com/x/.config?x=b0e91ad4b5f69c47
dashboard link: https://syzkaller.appspot.com/bug?extid=f3d6fb5d74531898ac44
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [da...@davemloft.net dhow...@redhat.com edum...@google.com ku...@kernel.org linu...@lists.infradead.org linux-...@vger.kernel.org marc....@auristor.com net...@vger.kernel.org pab...@redhat.com net...@vger.kernel.org]

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f6ec6bfd733a/disk-aba5b397.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/61099c9161b6/vmlinux-aba5b397.xz
kernel image: https://storage.googleapis.com/syzbot-assets/307592eb5dad/bzImage-aba5b397.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f3d6fb...@syzkaller.appspotmail.com

BUG: spinlock bad magic on CPU#0, syz-executor.2/32135
==================================================================
BUG: KASAN: slab-out-of-bounds in task_pid_nr include/linux/sched.h:1565 [inline]
BUG: KASAN: slab-out-of-bounds in spin_dump kernel/locking/spinlock_debug.c:63 [inline]
BUG: KASAN: slab-out-of-bounds in spin_bug.cold+0x95/0x9e kernel/locking/spinlock_debug.c:77
Read of size 4 at addr ffff8881d02bd878 by task syz-executor.2/32135

CPU: 0 PID: 32135 Comm: syz-executor.2 Not tainted 6.1.0-syzkaller-07447-gaba5b397cad7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:284 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:395
kasan_report+0xbf/0x1f0 mm/kasan/report.c:495
task_pid_nr include/linux/sched.h:1565 [inline]
spin_dump kernel/locking/spinlock_debug.c:63 [inline]
spin_bug.cold+0x95/0x9e kernel/locking/spinlock_debug.c:77
debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline]
do_raw_spin_lock+0x219/0x2b0 kernel/locking/spinlock_debug.c:114
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
_raw_spin_lock_irqsave+0x45/0x60 kernel/locking/spinlock.c:162
skb_queue_tail+0x25/0x150 net/core/skbuff.c:3569
rxrpc_encap_rcv+0x106/0x230 net/rxrpc/io_thread.c:39
udpv6_queue_rcv_one_skb+0xa76/0x15c0 net/ipv6/udp.c:731
udpv6_queue_rcv_skb+0x192/0x9c0 net/ipv6/udp.c:792
udp6_unicast_rcv_skb+0x157/0x2f0 net/ipv6/udp.c:935
__udp6_lib_rcv+0xcca/0x2a30 net/ipv6/udp.c:1020
ip6_protocol_deliver_rcu+0x2dd/0x1280 net/ipv6/ip6_input.c:439
ip6_input_finish+0x150/0x2c0 net/ipv6/ip6_input.c:484
NF_HOOK include/linux/netfilter.h:302 [inline]
NF_HOOK include/linux/netfilter.h:296 [inline]
ip6_input+0xa0/0xd0 net/ipv6/ip6_input.c:493
dst_input include/net/dst.h:454 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
NF_HOOK include/linux/netfilter.h:296 [inline]
ipv6_rcv+0x250/0x380 net/ipv6/ip6_input.c:309
__netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5482
__netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5596
process_backlog+0x3e4/0x810 net/core/dev.c:5924
__napi_poll+0xb8/0x770 net/core/dev.c:6485
napi_poll net/core/dev.c:6552 [inline]
net_rx_action+0xa00/0xde0 net/core/dev.c:6663
__do_softirq+0x1fb/0xadc kernel/softirq.c:571
do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
</IRQ>
<TASK>
do_softirq kernel/softirq.c:464 [inline]
__local_bh_enable_ip+0x106/0x130 kernel/softirq.c:396
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:834 [inline]
ip6_finish_output2+0x5be/0x1530 net/ipv6/ip6_output.c:135
__ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
ip6_finish_output+0x694/0x1170 net/ipv6/ip6_output.c:206
NF_HOOK_COND include/linux/netfilter.h:291 [inline]
ip6_output+0x1f1/0x540 net/ipv6/ip6_output.c:227
dst_output include/net/dst.h:444 [inline]
ip6_local_out+0xb3/0x1a0 net/ipv6/output_core.c:155
ip6_send_skb+0xbb/0x340 net/ipv6/ip6_output.c:1971
udp_v6_send_skb+0x82a/0x18a0 net/ipv6/udp.c:1294
udpv6_sendmsg+0x20e2/0x2c80 net/ipv6/udp.c:1586
inet6_sendmsg+0x9d/0xe0 net/ipv6/af_inet6.c:660
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff4c5c8c0d9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff4c6a28168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff4c5dabf80 RCX: 00007ff4c5c8c0d9
RDX: 0000000000000000 RSI: 0000000020000700 RDI: 0000000000000003
RBP: 00007ff4c5ce7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdcd41965f R14: 00007ff4c6a28300 R15: 0000000000022000
</TASK>

Allocated by task 15677:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]
ref_tracker_alloc+0x158/0x560 lib/ref_tracker.c:85
__netdev_tracker_alloc include/linux/netdevice.h:4020 [inline]
netdev_hold include/linux/netdevice.h:4049 [inline]
netdev_hold include/linux/netdevice.h:4044 [inline]
netdev_queue_add_kobject net/core/net-sysfs.c:1663 [inline]
netdev_queue_update_kobjects+0x1ab/0x4f0 net/core/net-sysfs.c:1718
register_queue_kobjects net/core/net-sysfs.c:1779 [inline]
netdev_register_kobject+0x334/0x400 net/core/net-sysfs.c:2019
register_netdevice+0xd77/0x1640 net/core/dev.c:10045
bond_newlink drivers/net/bonding/bond_netlink.c:560 [inline]
bond_newlink+0x4b/0xa0 drivers/net/bonding/bond_netlink.c:550
rtnl_newlink_create net/core/rtnetlink.c:3407 [inline]
__rtnl_newlink+0x10c2/0x1840 net/core/rtnetlink.c:3624
rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3637
rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141
netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2564
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xd3/0x120 net/socket.c:734
____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
__sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff8881d02bd840
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 24 bytes to the right of
32-byte region [ffff8881d02bd840, ffff8881d02bd860)

The buggy address belongs to the physical page:
page:ffffea000740af40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d02bd
ksm flags: 0x57ff00000000200(slab|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000000200 ffff888012441500 ffffea00071e7dc0 dead000000000003
raw: 0000000000000000 0000000000400040 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 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 12154, tgid 12154 (kworker/u4:1), ts 1739632921633, free_ts 1738784260758
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291
__alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
__slab_alloc_node mm/slub.c:3345 [inline]
slab_alloc_node mm/slub.c:3442 [inline]
__kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491
__do_kmalloc_node mm/slab_common.c:967 [inline]
__kmalloc+0x4a/0xd0 mm/slab_common.c:981
kmalloc include/linux/slab.h:584 [inline]
batadv_tt_prepare_tvlv_local_data+0x1b2/0x650 net/batman-adv/translation-table.c:950
batadv_tt_tvlv_container_update+0x158/0x780 net/batman-adv/translation-table.c:1005
batadv_tt_local_commit_changes_nolock+0xc3d/0xd80 net/batman-adv/translation-table.c:3691
batadv_tt_local_commit_changes+0x26/0x40 net/batman-adv/translation-table.c:3719
batadv_iv_ogm_schedule_buff+0x10fd/0x1450 net/batman-adv/bat_iv_ogm.c:812
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x744/0x910 net/batman-adv/bat_iv_ogm.c:1713
process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289
worker_thread+0x669/0x1090 kernel/workqueue.c:2436
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+0x65c/0xd90 mm/page_alloc.c:1509
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page_list+0x176/0xc40 mm/page_alloc.c:3529
release_pages+0xc8a/0x1360 mm/swap.c:1055
tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:59
tlb_flush_mmu_free mm/mmu_gather.c:254 [inline]
tlb_flush_mmu mm/mmu_gather.c:261 [inline]
tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:361
exit_mmap+0x202/0x7b0 mm/mmap.c:3096
__mmput+0x128/0x4c0 kernel/fork.c:1188
mmput+0x60/0x70 kernel/fork.c:1210
exit_mm kernel/exit.c:516 [inline]
do_exit+0xa41/0x2a30 kernel/exit.c:807
do_group_exit+0xd4/0x2a0 kernel/exit.c:950
__do_sys_exit_group kernel/exit.c:961 [inline]
__se_sys_exit_group kernel/exit.c:959 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:959
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
ffff8881d02bd700: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
ffff8881d02bd780: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
>ffff8881d02bd800: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
^
ffff8881d02bd880: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
ffff8881d02bd900: 00 00 00 00 fc fc fc fc 00 00 00 00 fc fc fc fc
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.