------------[ cut here ]------------ WARNING: CPU: 1 PID: 8 at net/ipv4/tcp_input.c:2132 tcp_timeout_mark_lost net/ipv4/tcp_input.c:2132 [inline] WARNING: CPU: 1 PID: 8 at net/ipv4/tcp_input.c:2132 tcp_enter_loss+0xdb2/0x1050 net/ipv4/tcp_input.c:2145 Modules linked in: CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 6.0.0-rc1-syzkaller-00409-ge3f259d33c0e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:tcp_timeout_mark_lost net/ipv4/tcp_input.c:2132 [inline] RIP: 0010:tcp_enter_loss+0xdb2/0x1050 net/ipv4/tcp_input.c:2145 Code: 00 00 89 ab 48 09 00 00 e9 b6 fc ff ff 48 8d 83 c8 0a 00 00 48 89 44 24 08 4c 8d b3 64 08 00 00 e9 ea f7 ff ff e8 be a6 9c f9 <0f> 0b e9 b1 f6 ff ff e8 b2 a6 9c f9 0f 0b e9 7c fb ff ff e8 16 fe RSP: 0018:ffffc900001e0ac8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88807a690c00 RCX: 0000000000000100 RDX: ffff88813fe5d880 RSI: ffffffff87df6492 RDI: 0000000000000004 RBP: 0000000000000009 R08: 0000000000000004 R09: 0000000000000011 R10: 0000000000000009 R11: 0000000000000002 R12: 0000000000000011 R13: 0000000000000008 R14: 0000000000000001 R15: 0000000000000009 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a970c8 CR3: 000000000bc8e000 CR4: 0000000000350ee0 Call Trace: tcp_retransmit_timer+0x25a3/0x33d0 net/ipv4/tcp_timer.c:503 tcp_write_timer_handler net/ipv4/tcp_timer.c:620 [inline] tcp_write_timer_handler+0x4de/0x9f0 net/ipv4/tcp_timer.c:594 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:637 call_timer_fn+0x1a0/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1519 [inline] __run_timers.part.0+0x674/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1d3/0x9c6 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 irq_exit_rcu+0x5/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:csd_lock_wait kernel/smp.c:414 [inline] RIP: 0010:smp_call_function_many_cond+0x5c3/0x1430 kernel/smp.c:988 Code: 89 ee e8 b0 ac 0a 00 85 ed 74 48 48 8b 44 24 08 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 f4 83 c5 03 e8 cf af 0a 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 b5 0b 00 00 8b 43 08 31 RSP: 0018:ffffc900000d7948 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b9a42580 RCX: 0000000000000000 RDX: ffff88813fe5d880 RSI: ffffffff81715b81 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed10173484b1 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000001 on_each_cpu_cond_mask+0x56/0xa0 kernel/smp.c:1154 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1302 [inline] text_poke_bp_batch+0x59e/0x6c0 arch/x86/kernel/alternative.c:1559 text_poke_flush arch/x86/kernel/alternative.c:1660 [inline] text_poke_flush arch/x86/kernel/alternative.c:1657 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1667 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32f/0x410 kernel/jump_label.c:801 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:811 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:803 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 ---------------- Code disassembly (best guess): 0: 89 ee mov %ebp,%esi 2: e8 b0 ac 0a 00 callq 0xaacb7 7: 85 ed test %ebp,%ebp 9: 74 48 je 0x53 b: 48 8b 44 24 08 mov 0x8(%rsp),%rax 10: 49 89 c4 mov %rax,%r12 13: 83 e0 07 and $0x7,%eax 16: 49 c1 ec 03 shr $0x3,%r12 1a: 48 89 c5 mov %rax,%rbp 1d: 4d 01 f4 add %r14,%r12 20: 83 c5 03 add $0x3,%ebp 23: e8 cf af 0a 00 callq 0xaaff7 28: f3 90 pause * 2a: 41 0f b6 04 24 movzbl (%r12),%eax <-- trapping instruction 2f: 40 38 c5 cmp %al,%bpl 32: 7c 08 jl 0x3c 34: 84 c0 test %al,%al 36: 0f 85 b5 0b 00 00 jne 0xbf1 3c: 8b 43 08 mov 0x8(%rbx),%eax 3f: 31 .byte 0x31