WARNING in tcp_enter

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	WARNING in tcp_enter_loss	C		error	1	1071d	1071d	0/1	upstream: reported C repro on 2022/01/07 14:26
android-49	WARNING in tcp_enter_loss	C			4	2424d	2071d	0/3	public: reported C repro on 2019/04/14 00:00
upstream	WARNING in tcp_enter_loss (2) net	C	done	unreliable	4	2418d	2468d	15/28	fixed on 2020/02/18 10:28
upstream	WARNING in tcp_enter_loss (3) net	C	inconclusive		7	775d	1072d	22/28	fixed on 2023/02/24 13:50

WARNING: CPU: 1 PID: 3331 at net/ipv4/tcp_input.c:1959 tcp_enter_loss+0xcd5/0xf80 net/ipv4/tcp_input.c:1959 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 3331 Comm: syz-executor7 Not tainted 4.15.0-rc1-next-20171201+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x211/0x2d0 lib/bug.c:184 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:177 fixup_bug arch/x86/kernel/traps.c:246 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1066 RIP: 0010:tcp_enter_loss+0xcd5/0xf80 net/ipv4/tcp_input.c:1959 RSP: 0018:ffff8801db5073f0 EFLAGS: 00010206 RAX: ffff8801c4b8a300 RBX: 0000000000000000 RCX: ffffffff84479c25 RDX: 0000000000000100 RSI: ffff8801c67877c4 RDI: ffff8801c678772c RBP: ffff8801db507468 R08: ffff88021fff805c R09: 0000000000000000 R10: ffff88021fff8050 R11: ffff88021fff805d R12: 000000000000fe90 R13: ffff8801cc8050b0 R14: dffffc0000000000 R15: ffff8801c6786ec0 tcp_retransmit_timer+0xcf2/0x2a00 net/ipv4/tcp_timer.c:477 tcp_write_timer_handler+0x335/0x820 net/ipv4/tcp_timer.c:564 tcp_write_timer+0x152/0x170 net/ipv4/tcp_timer.c:584 call_timer_fn+0x23b/0x840 kernel/time/timer.c:1330 expire_timers kernel/time/timer.c:1367 [inline] __run_timers+0x7e1/0xb60 kernel/time/timer.c:1670 run_timer_softirq+0x4c/0x90 kernel/time/timer.c:1696 __do_softirq+0x29d/0xbb2 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1d3/0x210 kernel/softirq.c:405 exiting_irq arch/x86/include/asm/apic.h:540 [inline] smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:907 </IRQ> RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:787 [inline] RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 kernel/locking/spinlock.c:199 RSP: 0018:ffff8801c4b277f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 RAX: dffffc0000000000 RBX: ffff8801db527900 RCX: 0000000000000000 RDX: 1ffffffff0bd9743 RSI: 0000000000000001 RDI: ffffffff85ecba18 RBP: ffff8801c4b27800 R08: ffff8801db527918 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c1648300 R13: 1ffff10038964f08 R14: ffff8801c4b8a300 R15: ffff8801c4b8a300 finish_lock_switch kernel/sched/sched.h:1369 [inline] finish_task_switch+0x1d3/0x740 kernel/sched/core.c:2667 context_switch kernel/sched/core.c:2803 [inline] __schedule+0x8f3/0x2060 kernel/sched/core.c:3376 schedule+0xf5/0x430 kernel/sched/core.c:3435 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x224/0x6e0 kernel/time/hrtimer.c:1640 hrtimer_nanosleep+0x2b2/0x860 kernel/time/hrtimer.c:1694 SYSC_nanosleep kernel/time/hrtimer.c:1726 [inline] SyS_nanosleep+0x175/0x1f0 kernel/time/hrtimer.c:1713 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x47e020 RSP: 002b:0000000000a6fa08 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 0000000000c59914 RCX: 000000000047e020 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000a6fa10 RBP: 0000000000000d02 R08: 0000000000000001 R09: 0000000000c59940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000d02 R13: 000000000000000f R14: 0000000000034718 R15: 0000000000000010 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..