------------[ cut here ]------------ WARNING: CPU: 1 PID: 7870 at net/mptcp/subflow.c:1505 subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1505 Modules linked in: CPU: 1 UID: 0 PID: 7870 Comm: syz.3.451 Not tainted 6.15.0-syzkaller-09113-g8477ab143069 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:subflow_data_ready+0x40b/0x7c0 net/mptcp/subflow.c:1505 Code: 89 ee e8 98 f2 56 f6 40 84 ed 75 21 e8 ae f7 56 f6 44 89 fe bf 07 00 00 00 e8 e1 f2 56 f6 41 83 ff 07 74 09 e8 96 f7 56 f6 90 <0f> 0b 90 e8 8d f7 56 f6 48 89 df e8 85 b0 ff ff 31 ff 89 c5 89 c6 RSP: 0018:ffffc90000590578 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888070da1980 RCX: ffffffff8b645eaf RDX: ffff88802355c880 RSI: ffffffff8b645eba RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007 R10: 0000000000000004 R11: 0000000000000001 R12: ffff888061fd1700 R13: 1ffff920000b20af R14: ffff888021105400 R15: 0000000000000004 FS: 0000000000000000(0000) GS:ffff88809787b000(0000) knlGS:0000000000000000 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 000000002f5ceffc CR3: 000000006e807000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: tcp_data_queue+0x13a4/0x4f50 net/ipv4/tcp_input.c:5302 tcp_rcv_state_process+0xfe8/0x4ed0 net/ipv4/tcp_input.c:7014 tcp_v4_do_rcv+0x1ad/0xa90 net/ipv4/tcp_ipv4.c:1948 tcp_v4_rcv+0x3609/0x4650 net/ipv4/tcp_ipv4.c:2363 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:317 [inline] NF_HOOK include/linux/netfilter.h:311 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:469 [inline] ip_rcv_finish net/ipv4/ip_input.c:447 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] NF_HOOK include/linux/netfilter.h:311 [inline] ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:567 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:5977 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6090 process_backlog+0x442/0x15e0 net/core/dev.c:6442 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:7414 napi_poll net/core/dev.c:7478 [inline] net_rx_action+0xa9f/0xfe0 net/core/dev.c:7605 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 ca bc 1c f6 48 89 df e8 b2 10 1d f6 e8 8d eb 47 f6 fb bf 01 00 00 00 52 38 0d f6 65 8b 05 db 12 2f 08 85 c0 74 06 5b e9 41 4d 00 00 RSP: 0018:ffffc900079273b0 EFLAGS: 00000202 RAX: 0000000000007857 RBX: ffff88804d715f18 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffffffff8dc00788 RDI: 0000000000000001 RBP: ffff88804d715f10 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff90878157 R11: 0000000000000001 R12: ffff88804d715f18 R13: ffff88804d715f10 R14: ffffc900079276e0 R15: 000000000000001d spin_unlock_irq include/linux/spinlock.h:401 [inline] filemap_remove_folio+0x106/0x250 mm/filemap.c:254 truncate_inode_folio+0x49/0x70 mm/truncate.c:176 shmem_undo_range+0x376/0x1150 mm/shmem.c:1121 shmem_truncate_range mm/shmem.c:1237 [inline] shmem_evict_inode+0x3a1/0xbe0 mm/shmem.c:1365 evict+0x3e3/0x920 fs/inode.c:810 iput_final fs/inode.c:1898 [inline] iput fs/inode.c:1924 [inline] iput+0x521/0x880 fs/inode.c:1910 dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466 __dentry_kill+0x1d0/0x600 fs/dcache.c:669 dput.part.0+0x4b1/0x9b0 fs/dcache.c:911 dput+0x1f/0x30 fs/dcache.c:901 __fput+0x51c/0xb70 fs/file_table.c:473 task_work_run+0x14d/0x240 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xae2/0x2c70 kernel/exit.c:959 do_group_exit+0xd3/0x2a0 kernel/exit.c:1108 get_signal+0x2673/0x26d0 kernel/signal.c:3034 arch_do_signal_or_restart+0x8f/0x790 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] __do_fast_syscall_32+0x2ac/0x3a0 arch/x86/entry/syscall_32.c:309 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:331 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f41579 Code: Unable to access opcode bytes at 0xf7f4154f. RSP: 002b:00000000f4c0160c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 00000000f7405138 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f740513c RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 5: 53 push %rbx 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fb mov %rdi,%rbx e: 48 83 c7 18 add $0x18,%rdi 12: e8 ca bc 1c f6 call 0xf61cbce1 17: 48 89 df mov %rbx,%rdi 1a: e8 b2 10 1d f6 call 0xf61d10d1 1f: e8 8d eb 47 f6 call 0xf647ebb1 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 52 38 0d f6 call 0xf60d3881 <-- trapping instruction 2f: 65 8b 05 db 12 2f 08 mov %gs:0x82f12db(%rip),%eax # 0x82f1311 36: 85 c0 test %eax,%eax 38: 74 06 je 0x40 3a: 5b pop %rbx 3b: e9 41 4d 00 00 jmp 0x4d81