------------[ cut here ]------------
WARNING: CPU: 1 PID: 9612 at net/mptcp/protocol.c:695 __mptcp_move_skbs_from_subflow+0x20a9/0x21f0 net/mptcp/protocol.c:695
Modules linked in:
CPU: 1 UID: 0 PID: 9612 Comm: syz.0.857 Not tainted 6.11.0-syzkaller-10547-g684a64bf32b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__mptcp_move_skbs_from_subflow+0x20a9/0x21f0 net/mptcp/protocol.c:695
Code: 0f b6 dc 31 ff 89 de e8 45 ca e8 f5 89 d8 48 81 c4 50 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 28 c7 e8 f5 90 <0f> 0b 90 e9 47 ff ff ff e8 1a c7 e8 f5 90 0f 0b 90 e9 99 e0 ff ff
RSP: 0018:ffffc90000a17d18 EFLAGS: 00010246
RAX: ffffffff8babee18 RBX: 00000000000002e8 RCX: ffff88802ce39e00
RDX: 0000000000000100 RSI: 00000000000081e5 RDI: 00000000000002e8
RBP: 1ffff1100f48561e R08: ffffffff8babde12 R09: 1ffff1100d4c761c
R10: dffffc0000000000 R11: ffffed100d4c761d R12: 0000000000000000
R13: dffffc0000000000 R14: 00000000e0f7a5d1 R15: 00000000000081e5
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2d98b5 CR3: 0000000067d7e000 CR4: 00000000003506f0
DR0: 0000000000002d8e DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
move_skbs_to_msk net/mptcp/protocol.c:811 [inline]
mptcp_data_ready+0x29c/0xa90 net/mptcp/protocol.c:854
subflow_data_ready+0x34a/0x920 net/mptcp/subflow.c:1490
tcp_data_queue+0x20fd/0x76c0 net/ipv4/tcp_input.c:5283
tcp_rcv_established+0xfba/0x2020 net/ipv4/tcp_input.c:6237
tcp_v4_do_rcv+0x96d/0xc70 net/ipv4/tcp_ipv4.c:1915
tcp_v4_rcv+0x2dc0/0x37f0 net/ipv4/tcp_ipv4.c:2350
ip_protocol_deliver_rcu+0x22e/0x440 net/ipv4/ip_input.c:205
ip_local_deliver_finish+0x341/0x5f0 net/ipv4/ip_input.c:233
NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
__netif_receive_skb_one_core net/core/dev.c:5662 [inline]
__netif_receive_skb+0x2bf/0x650 net/core/dev.c:5775
process_backlog+0x662/0x15b0 net/core/dev.c:6107
__napi_poll+0xcb/0x490 net/core/dev.c:6771
napi_poll net/core/dev.c:6840 [inline]
net_rx_action+0x89b/0x1240 net/core/dev.c:6962
handle_softirqs+0x2c5/0x980 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1037 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1037
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__preempt_count_sub arch/x86/include/asm/preempt.h:84 [inline]
RIP: 0010:preempt_count_sub+0x5d/0x170 kernel/sched/core.c:5821
Code: 22 65 8b 05 ed d2 a0 7e 89 c1 81 e1 ff ff ff 7f 39 d9 7c 27 81 fb fe 00 00 00 77 07 0f b6 c0 85 c0 74 5f 65 8b 05 cb d2 a0 7e db 65 01 1d c2 d2 a0 7e 5b 41 5e c3 cc cc cc cc 90 e8 6c 10 55
RSP: 0018:ffffc90003a97528 EFLAGS: 00000202
RAX: 0000000080000001 RBX: 0000000000000001 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8c0aca40 RDI: 0000000000000001
RBP: ffffc90003a975d0 R08: ffffffff942687f7 R09: 1ffffffff284d0fe
R10: dffffc0000000000 R11: fffffbfff284d0ff R12: dffffc0000000000
R13: 1ffff92000752ea8 R14: dffffc0000000000 R15: 0000000000000246
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xdd/0x140 kernel/locking/spinlock.c:194
__debug_check_no_obj_freed lib/debugobjects.c:998 [inline]
debug_check_no_obj_freed+0x561/0x580 lib/debugobjects.c:1019
slab_free_hook mm/slub.c:2274 [inline]
slab_free mm/slub.c:4580 [inline]
kmem_cache_free+0x11f/0x420 mm/slub.c:4682
exit_mmap+0x5c6/0xc40 mm/mmap.c:1888
__mmput+0x115/0x390 kernel/fork.c:1347
exit_mm+0x220/0x310 kernel/exit.c:571
do_exit+0x9b2/0x28e0 kernel/exit.c:926
do_group_exit+0x207/0x2c0 kernel/exit.c:1088
get_signal+0x176f/0x1810 kernel/signal.c:2936
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0121d7def9
Code: Unable to access opcode bytes at 0x7f0121d7decf.
RSP: 002b:00007f0122b7c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f0121f35f88 RCX: 00007f0121d7def9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f0121f35f88
RBP: 00007f0121f35f80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0121f35f8c
R13: 0000000000000000 R14: 00007f012205f940 R15: 00007f012205fa28
----------------
Code disassembly (best guess):
0: 22 65 8b and -0x75(%rbp),%ah
3: 05 ed d2 a0 7e add $0x7ea0d2ed,%eax
8: 89 c1 mov %eax,%ecx
a: 81 e1 ff ff ff 7f and $0x7fffffff,%ecx
10: 39 d9 cmp %ebx,%ecx
12: 7c 27 jl 0x3b
14: 81 fb fe 00 00 00 cmp $0xfe,%ebx
1a: 77 07 ja 0x23
1c: 0f b6 c0 movzbl %al,%eax
1f: 85 c0 test %eax,%eax
21: 74 5f je 0x82
23: 65 8b 05 cb d2 a0 7e mov %gs:0x7ea0d2cb(%rip),%eax # 0x7ea0d2f5
* 2a: f7 db neg %ebx <-- trapping instruction
2c: 65 01 1d c2 d2 a0 7e add %ebx,%gs:0x7ea0d2c2(%rip) # 0x7ea0d2f5
33: 5b pop %rbx
34: 41 5e pop %r14
36: c3 ret
37: cc int3
38: cc int3
39: cc int3
3a: cc int3
3b: 90 nop
3c: e8 .byte 0xe8
3d: 6c insb (%dx),%es:(%rdi)
3e: 10 .byte 0x10
3f: 55 push %rbp