linux-kernel - Re: [GIT PULL] Networking for v6.17-rc3

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Message-ID: <20250821102721.6deae493@kernel.org>
Date: Thu, 21 Aug 2025 10:27:21 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: torvalds@...ux-foundation.org
Cc: davem@...emloft.net, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, pabeni@...hat.com
Subject: Re: [GIT PULL] Networking for v6.17-rc3

On Thu, 21 Aug 2025 10:16:41 -0700 Jakub Kicinski wrote:
> Hi Linus!

FWIW I'm hitting the splat below from random code paths (futex, epoll,
bpf) when running your tree within Meta. Takes some time to hit, IDK
what exactly triggers it. Could be a driver tho I can hit it on two
different generations of servers.

[ 2121.610162] BUG: sleeping function called from invalid context at mm/vmalloc.c:3409
[ 2121.625698] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 3382, name: x
[ 2121.642639] preempt_count: 1, expected: 0
[ 2121.651190] RCU nest depth: 0, expected: 0
[ 2121.660177] INFO: lockdep is turned off.
[ 2121.668619] Preemption disabled at:
[ 2121.668625] [<ffffffff84565d0f>] schedule+0x15f/0x360
[ 2121.686927] CPU: 9 UID: 34126 PID: 3382 Comm: x Kdump: loaded Tainted: G S               N  6.17.0-rc2-00079-g1c656b1efde6 #136 PREEMPT(none) 
[ 2121.686938] Tainted: [S]=CPU_OUT_OF_SPEC, [N]=TEST
[ 2121.686944] Call Trace:
[ 2121.686947]  <TASK>
[ 2121.686950]  dump_stack_lvl+0xe3/0x160
[ 2121.686962]  ? show_regs_print_info+0x10/0x10
[ 2121.686969]  ? thaw_kernel_threads+0x1c0/0x1c0
[ 2121.686985]  ? schedule+0x15f/0x360
[ 2121.686992]  __might_resched+0x474/0x5f0
[ 2121.687001]  ? schedule+0x15f/0x360
[ 2121.687006]  ? __might_sleep+0xe0/0xe0
[ 2121.687012]  ? rcu_force_quiescent_state+0x250/0x250
[ 2121.687020]  ? _raw_spin_unlock_irqrestore+0xa5/0x100
[ 2121.687026]  ? _raw_spin_unlock+0x40/0x40
[ 2121.687041]  vfree+0x41/0x2f0
[ 2121.687052]  __mmdrop+0x25f/0x490
[ 2121.687062]  finish_task_switch+0x31c/0x7a0
[ 2121.687076]  __schedule+0x158a/0x26b0
[ 2121.687098]  ? is_mmconf_reserved+0x390/0x390
[ 2121.687109]  ? schedule+0x92/0x360
[ 2121.687112]  ? rcu_is_watching+0x1b/0x90
[ 2121.687122]  ? rcu_is_watching+0x1b/0x90
[ 2121.687131]  ? _raw_spin_unlock+0x40/0x40
[ 2121.687141]  schedule+0x166/0x360
[ 2121.687148]  schedule_hrtimeout_range_clock+0x110/0x290
[ 2121.687154]  ? ktime_get+0x2b/0x120
[ 2121.687162]  ? schedule_timeout_idle+0xb0/0xb0
[ 2121.687170]  ? hrtimer_dummy_timeout+0x10/0x10
[ 2121.687184]  ? ktime_get+0x64/0x120
[ 2121.687190]  ? do_epoll_wait+0x75e/0xcc0
[ 2121.687197]  do_epoll_wait+0xabe/0xcc0
[ 2121.687205]  ? do_epoll_wait+0x75e/0xcc0
[ 2121.687227]  ? ep_destroy_wakeup_source+0xd0/0xd0
[ 2121.687234]  ? do_epoll_wait+0xcc0/0xcc0
[ 2121.687246]  ? nsecs_to_jiffies+0x20/0x20
[ 2121.687251]  ? kmem_cache_free+0x18c/0x410
[ 2121.687259]  ? entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 2121.687268]  __x64_sys_epoll_wait+0x179/0x1c0
[ 2121.687276]  ? ep_try_send_events+0xb50/0xb50
[ 2121.687284]  ? rcu_is_watching+0x1b/0x90
[ 2121.687294]  ? entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 2121.687300]  ? entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 2121.687305]  do_syscall_64+0x86/0x2d0
[ 2121.687309]  ? trace_irq_enable+0x60/0x180
[ 2121.687319]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 2121.687324] RIP: 0033:0x7f46cc32c482
[ 2121.687343] Code: 89 55 f8 48 89 75 f0 89 7d fc 89 4d ec e8 c6 a7 f6 ff 41 89 c0 44 8b 55 ec 8b 55 f8 48 8b 75 f0 8b 7d fc b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 44 89 c7 89 45 fc e8 fb a7 f6 ff 8b 45 fc
[ 2121.687347] RSP: 002b:00007f46507cc2a0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8
[ 2121.687355] RAX: ffffffffffffffda RBX: 00007f467a5bb800 RCX: 00007f46cc32c482
[ 2121.687359] RDX: 0000000000000020 RSI: 00007f467a5bb800 RDI: 000000000000017f
[ 2121.687363] RBP: 00007f46507cc2c0 R08: 0000000000000000 R09: 7fffffffffffffff
[ 2121.687366] R10: 0000000000001b47 R11: 0000000000000293 R12: 0000000000000000
[ 2121.687369] R13: 00007f4668c30000 R14: 00007f4668c30000 R15: 00000000021d3a00