Subject: Re: [BUG bpf-next] bpf/net: Hitting gpf when running selftests

From: Jiri Olsa <[email-masked]>
Date: Wed, 30 Aug 2023 23:07:06 +0200

On Wed, Aug 30, 2023 at 08:58:11PM +0200, Jiri Olsa wrote:
> hi,
> I'm hitting crash below on bpf-next/master when running selftests,
> full log and config attached

it seems to be 'test_progs -t sockmap_listen' triggering that

jirka

> 
> jirka
> 
> 
> ---
> [ 1022.710250][ T2556] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6b73: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC NOPTI^M
> [ 1022.711206][ T2556] CPU: 2 PID: 2556 Comm: kworker/2:4 Tainted: G           OE      6.5.0+ #693 1723c8b9805ff5a1672ab7e6f25977078a7bcceb^M
> [ 1022.712120][ T2556] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014^M
> [ 1022.712830][ T2556] Workqueue: events sk_psock_backlog^M
> [ 1022.713262][ T2556] RIP: 0010:skb_dequeue+0x4c/0x80^M
> [ 1022.713653][ T2556] Code: 41 48 85 ed 74 3c 8b 43 10 4c 89 e7 83 e8 01 89 43 10 48 8b 45 08 48 8b 55 00 48 c7 45 08 00 00 00 00 48 c7 45 00 00 00 00 00 <48> 89 42 08 48 89 10 e8 e8 6a 41 00 48 89 e8 5b 5d 41 5c c3 cc cc^M
> [ 1022.714963][ T2556] RSP: 0018:ffffc90003ca7dd0 EFLAGS: 00010046^M
> [ 1022.715431][ T2556] RAX: 6b6b6b6b6b6b6b6b RBX: ffff88811de269d0 RCX: 0000000000000000^M
> [ 1022.716068][ T2556] RDX: 6b6b6b6b6b6b6b6b RSI: 0000000000000282 RDI: ffff88811de269e8^M
> [ 1022.716676][ T2556] RBP: ffff888141ae39c0 R08: 0000000000000001 R09: 0000000000000000^M
> [ 1022.717283][ T2556] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88811de269e8^M
> [ 1022.717930][ T2556] R13: 0000000000000001 R14: ffff888141ae39c0 R15: ffff88810a20e640^M
> [ 1022.718549][ T2556] FS:  0000000000000000(0000) GS:ffff88846d600000(0000) knlGS:0000000000000000^M
> [ 1022.719241][ T2556] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033^M
> [ 1022.719761][ T2556] CR2: 00007fb5c25ca000 CR3: 000000012b902004 CR4: 0000000000770ee0^M
> [ 1022.720394][ T2556] PKRU: 55555554^M
> [ 1022.720699][ T2556] Call Trace:^M
> [ 1022.720984][ T2556]  <TASK>^M
> [ 1022.721254][ T2556]  ? die_addr+0x32/0x80^M
> [ 1022.721589][ T2556]  ? exc_general_protection+0x25a/0x4b0^M
> [ 1022.722026][ T2556]  ? asm_exc_general_protection+0x22/0x30^M
> [ 1022.722489][ T2556]  ? skb_dequeue+0x4c/0x80^M
> [ 1022.722854][ T2556]  sk_psock_backlog+0x27a/0x300^M
> [ 1022.723243][ T2556]  process_one_work+0x2a7/0x5b0^M
> [ 1022.723633][ T2556]  worker_thread+0x4f/0x3a0^M
> [ 1022.723998][ T2556]  ? __pfx_worker_thread+0x10/0x10^M
> [ 1022.724386][ T2556]  kthread+0xfd/0x130^M
> [ 1022.724709][ T2556]  ? __pfx_kthread+0x10/0x10^M
> [ 1022.725066][ T2556]  ret_from_fork+0x2d/0x50^M
> [ 1022.725409][ T2556]  ? __pfx_kthread+0x10/0x10^M
> [ 1022.725799][ T2556]  ret_from_fork_asm+0x1b/0x30^M
> [ 1022.726201][ T2556]  </TASK>^M