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Johannes Berg , "linux-kernel@vger.kernel.org" Cc: "linux-next@vger.kernel.org" , "llvm@lists.linux.dev" , Thomas Gleixner , linux-wireless@vger.kernel.org, spasswolf@web.de Date: Fri, 16 May 2025 20:19:59 +0200 In-Reply-To: References: <20250513164807.51780-1-spasswolf@web.de> <87h61ojg3g.ffs@tglx> <7471a185adcc34a79c2ab8ce1e87ab922ae2232b.camel@web.de> <2d8c1929bf5ab5260dacf9aa390456b3b49ce465.camel@sipsolutions.net> <2cad838b39f00d93319509d2a6a77a4c42c7fa92.camel@web.de> <8684a2b4bf367e2e2a97e2b52356ffe5436a8270.camel@sipsolutions.net> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.56.1-1 Precedence: bulk X-Mailing-List: linux-next@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:a/xw0bSc2Eo/mXot/Scjsv8aM99ZOruv4XCQwbG9/7ZBEBwiBvs rpIvr3f5FEYu7u74M0YQom2c5bfcYLeEbapkrS+zr0rhzan4dBKnzSP9FEUqtYK13n06GE6 K/6Duod2/lRUCWrmQizipvtGQua/S9mAuyjjvQan7P21WocOcE4VqX9WHuLgY1c3Y4nYw71 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iolIGboL4L3b0FIFa5IVGsre35mwsYWQLLQj53DYiGzzffdX4NXfh4t6+1e32fTFVThSuesO6 ohjlTiR4ifrop+0ul0daZ+9oTuGjD14YPkCagbNw2+RyfEzUZDGKhCwxYqCfeX1xdj/SadvuZ YcsMYZsUeJRXRFrQVBWYnlT7s14/Si2vYUGjITxHorjvxOYJDwThbVRJFnbisK+4Edns09cnv I8CLwPhVSArROswYUu+svoMvrc1Xv/B99C9KH8QXHbBUk4270IvxkygMoqLUDOcZrK3dASN4k gp6vdaoHkWBO4OH0hwwR9A4N2caTdfw2vpsgkInOj1mFv/uqcfPcgk0XjDPc8p6iJAOZaw1br VSsS6iUK9rrFxDNqcB42LY8haW6WovmGe33/SNIAjHZvml0PRCN4SErAxMxX9LEPUXppv/K9y LRCBuqKpF+CChMgZvTVCXfR2herel+9T4L2XoL92f11PzCQUVAgJ2glFZrOq9pj1sejJpG33G IzWekV20Wlf2UqCv9AnrDS0yLQ1mn6sq5LB6ueyvAPhtODmeeDVp9904w6NpsrG3VwHx0YCUy gyN7gBei+/VQH48Te+4iEWeqstTKAuPEkA+ZcUti0PGIkzgDXX9vk0Yus7CGNK2ifLZNJKTa8 fnKYyuMbSnVvETPH7ofZQ8xf2NNk4XeSLxBT9qx0KDpve+iAu712+xxKyr6Sqg/quB9U2emkP dJMl0gaCLbSs1LMAsEJScuUp6vXdFymXTlJXXLr8OIjlXjzFCz+6VDv12ZF11xZY9rCTS/ptn e9anHvJYTC8oxaXJ5eJ3GtSe3LGOvs+8qa/yFZP6VcTWALe6EqMnIwGI4SjFpDxJu9oxyElRj aQsFjMQ4KGXk2TnbI4IRRxhNA3589iYQklgOFh5HPcXsdxe0BaG+ZLK/ZmSau03OskWI5OTw5 fbgnaT8vMVeEo6O2RgFHU36AMD2Zh5McIlzYFU+r/9LqmGj5tAV1PsKSxBtmV0D2m4bdYhw1m hQ3w1LMtJz0Uj4hC3+Cepa8u4tGPHLk5g3zsZUx8inJSZencMIOapcE57DbBWTsZmvscSR7li wniLGxnI1aE8lXGt6O+W7+FFU2VEiQ89VtGjJigCuvM2nxzDJUMgb9R5ZDLpVjErtSMX0cLBd ky3UTuTDNZZ2rT+zwVoec5iw5D61qmkZ1Ksz4L4KGkVE/1BKq4YxFXu20hIplzz1nIHZIPIrL 3lU9BCrfR8RAvYujYO9X0dppUQiW27UJC8Air4Q+tb3E6zh3RMth8WMrvraARK3opctT96FuC 2iH+oTDlScu4dRdd1ThrYVRkvanQt8YC6OWTlotuWbvl2bwxW+4ycnKLcGvGOusBg== I've added a debugging statement: diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 3bd5ee0995fe..853493eca4f5 100644 =2D-- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -4586,7 +4586,11 @@ static noinline void ieee80211_8023_xmit_clang_debu= g_helper(struct sk_buff *skb, struct ieee802= 11_local *local, struct ieee802= 11_tx_info *info) { - if (unlikely(skb->sk && sock_flag(skb->sk, SOCK_WIFI_STATUS))) { + if (unlikely(skb->sk && ((skb_shinfo(skb)->tx_flags & SKBTX_WIFI_S= TATUS) || + sock_flag(skb->sk, SOCK_WIFI_STATUS)))) { + if ((skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) ^ sock= _flag(skb->sk, SOCK_WIFI_STATUS)) + printk(KERN_INFO "%s: skb_shinfo(skb)->tx_flags & = SKBTX_WIFI_STATUS =3D %u sock_flag(skb->sk, SOCK_WIFI_STATUS) =3D %u\n", + __func__, (skb_shinfo(skb)->tx_fla= gs & SKBTX_WIFI_STATUS), sock_flag(skb->sk, SOCK_WIFI_STATUS)); info->status_data =3D ieee80211_store_ack_skb(local, skb, &info->flags, = NULL); if (info->status_data) This gives the following logoutput (and a lockup), indicating that sock_fl= ag(skb->sk, SOCK_WIFI_STATUS) and (skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) are actually NOT equivalen= t (when compiled with clang and PREEMPT_RT=3Dy) 2025-05-16T20:09:58.818563+02:00 lisa kernel: [ T581] ieee80211_8023_xmit= _clang_debug_helper: skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS =3D 0 sock_flag(skb->sk, SOCK_WIFI_STATUS) =3D 1 2025-05-16T20:10:19.829599+02:00 lisa kernel: [ C2] rcu: INFO: rcu_pree= mpt detected stalls on CPUs/tasks: 2025-05-16T20:10:19.829607+02:00 lisa kernel: [ C2] rcu: 4-...!: (1 GP= s behind) idle=3D1ddc/1/0x4000000000000000 softirq=3D0/0 fqs=3D72 rcuc=3D21002 jiffies(starved) 2025-05-16T20:10:19.829609+02:00 lisa kernel: [ C2] rcu: 14-...!: (1 G= Ps behind) idle=3D4cbc/1/0x4000000000000000 softirq=3D0/0 fqs=3D72 rcuc=3D21013 jiffies(starved) 2025-05-16T20:10:19.829611+02:00 lisa kernel: [ C2] rcu: Tasks blocked= on level-0 rcu_node (CPUs 0-15): P581 2025-05-16T20:10:19.829613+02:00 lisa kernel: [ C2] rcu: (detected by = 2, t=3D21002 jiffies, g=3D7525, q=3D973 ncpus=3D16) 2025-05-16T20:10:19.829615+02:00 lisa kernel: [ C2] Sending NMI from CP= U 2 to CPUs 4: 2025-05-16T20:10:19.829616+02:00 lisa kernel: [ C4] NMI backtrace for c= pu 4 2025-05-16T20:10:19.829618+02:00 lisa kernel: [ C4] CPU: 4 UID: 0 PID: = 581 Comm: napi/phy0-0 Not tainted 6.15.0-rc6- next-20250513-llvm-00011-gf9a7992d47e7 #978 PREEMPT_{RT,(full)}=20 2025-05-16T20:10:19.829620+02:00 lisa kernel: [ C4] Hardware name: Micr= o-Star International Co., Ltd. Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.10F 11/11/2024 2025-05-16T20:10:19.829622+02:00 lisa kernel: [ C4] RIP: 0010:rtlock_sl= owlock_locked+0xaed/0xc70 2025-05-16T20:10:19.829623+02:00 lisa kernel: [ C4] Code: 59 61 6a ff 4= 9 c7 07 01 00 00 00 4d 89 7f 08 65 ff 0d b7 bd c1 00 74 4f 4d 85 ed 0f 84 76 ff ff ff e8 77 28 71 ff 48 8b 43 18 <48> 83 = e0 fe 49 39 c5 75 2a 41 83 7d 34 00 0f 84 54 ff ff ff 41 8b 2025-05-16T20:10:19.829625+02:00 lisa kernel: [ C4] RSP: 0018:ffffcc0dc= 1ef7b00 EFLAGS: 00000246 2025-05-16T20:10:19.829627+02:00 lisa kernel: [ C4] RAX: ffff89e9c52f80= 01 RBX: ffff89e9e17a2e10 RCX: ffff89e9c52f8001 2025-05-16T20:10:19.829629+02:00 lisa kernel: [ C4] RDX: ffffcc0dc1ef7b= 38 RSI: ffff89e9c52fd000 RDI: ffffcc0dc1ef7bf0 2025-05-16T20:10:19.829631+02:00 lisa kernel: [ C4] RBP: ffff89e9c52fd8= 20 R08: ffffffffffffeb42 R09: 0000000000000002 2025-05-16T20:10:19.829632+02:00 lisa kernel: [ C4] R10: 00000000000000= e4 R11: 00000000000005fe R12: ffffcc0dc1ef7b38 2025-05-16T20:10:19.829634+02:00 lisa kernel: [ C4] R13: ffff89e9c52f80= 00 R14: ffff89e9c52fd000 R15: ffffcc0dc1ef7bf0 2025-05-16T20:10:19.829636+02:00 lisa kernel: [ C4] FS: 00000000000000= 00(0000) GS:ffff89f8986c1000(0000) knlGS:0000000000000000 2025-05-16T20:10:19.829637+02:00 lisa kernel: [ C4] CS: 0010 DS: 0000 = ES: 0000 CR0: 0000000080050033 2025-05-16T20:10:19.829638+02:00 lisa kernel: [ C4] CR2: 00007f9ea92e20= 00 CR3: 00000007e5a3a000 CR4: 0000000000750ef0 2025-05-16T20:10:19.829640+02:00 lisa kernel: [ C4] PKRU: 55555554 2025-05-16T20:10:19.829642+02:00 lisa kernel: [ C4] Call Trace: 2025-05-16T20:10:19.829643+02:00 lisa kernel: [ C4] 2025-05-16T20:10:19.829644+02:00 lisa kernel: [ C4] ? rt_spin_unlock+0= x12/0x40 2025-05-16T20:10:19.829646+02:00 lisa kernel: [ C4] ? srso_alias_retur= n_thunk+0x5/0xfbef5 2025-05-16T20:10:19.829648+02:00 lisa kernel: [ C4] rt_spin_lock+0x81/= 0xa0 2025-05-16T20:10:19.829649+02:00 lisa kernel: [ C4] mt76_rx_complete+0= x49/0x2e0 [mt76] 2025-05-16T20:10:19.829651+02:00 lisa kernel: [ C4] ? srso_alias_retur= n_thunk+0x5/0xfbef5 2025-05-16T20:10:19.829653+02:00 lisa kernel: [ C4] mt76_rx_poll_compl= ete+0x4a4/0x4d0 [mt76] 2025-05-16T20:10:19.829654+02:00 lisa kernel: [ C4] ? mt76_dma_rx_poll= +0xf6/0x660 [mt76] 2025-05-16T20:10:19.829656+02:00 lisa kernel: [ C4] mt76_dma_rx_poll+0= x147/0x660 [mt76] 2025-05-16T20:10:19.829657+02:00 lisa kernel: [ C4] ? mt792x_poll_rx+0= x2a/0x120 [mt792x_lib] 2025-05-16T20:10:19.829658+02:00 lisa kernel: [ C4] mt792x_poll_rx+0x7= 1/0x120 [mt792x_lib] 2025-05-16T20:10:19.829660+02:00 lisa kernel: [ C4] __napi_poll+0x2a/0= x170 2025-05-16T20:10:19.829662+02:00 lisa kernel: [ C4] ? napi_threaded_po= ll_loop+0x32/0x1b0 2025-05-16T20:10:19.829663+02:00 lisa kernel: [ C4] napi_threaded_poll= _loop+0xe4/0x1b0 2025-05-16T20:10:19.829678+02:00 lisa kernel: [ C4] ? napi_threaded_po= ll_loop+0x32/0x1b0 2025-05-16T20:10:19.829679+02:00 lisa kernel: [ C4] ? asm_sysvec_apic_= timer_interrupt+0x1a/0x20 2025-05-16T20:10:19.829680+02:00 lisa kernel: [ C4] napi_threaded_poll= +0x57/0x80 2025-05-16T20:10:19.829682+02:00 lisa kernel: [ C4] ? __pfx_napi_threa= ded_poll+0x10/0x10 2025-05-16T20:10:19.829683+02:00 lisa kernel: [ C4] kthread+0x25c/0x28= 0 2025-05-16T20:10:19.829685+02:00 lisa kernel: [ C4] ? __pfx_kthread+0x= 10/0x10 2025-05-16T20:10:19.829696+02:00 lisa kernel: [ C4] ret_from_fork+0xc4= /0x1b0 2025-05-16T20:10:19.829698+02:00 lisa kernel: [ C4] ? __pfx_kthread+0x= 10/0x10 2025-05-16T20:10:19.829699+02:00 lisa kernel: [ C4] ret_from_fork_asm+= 0x1a/0x30 2025-05-16T20:10:19.829701+02:00 lisa kernel: [ C4] 2025-05-16T20:10:19.829702+02:00 lisa kernel: [ C2] Sending NMI from CP= U 2 to CPUs 14: 2025-05-16T20:10:19.829704+02:00 lisa kernel: [ C14] NMI backtrace for c= pu 14 2025-05-16T20:10:19.829705+02:00 lisa kernel: [ C14] CPU: 14 UID: 0 PID:= 585 Comm: napi/phy0-0 Not tainted 6.15.0-rc6- next-20250513-llvm-00011-gf9a7992d47e7 #978 PREEMPT_{RT,(full)}=20 2025-05-16T20:10:19.829707+02:00 lisa kernel: [ C14] Hardware name: Micr= o-Star International Co., Ltd. Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.10F 11/11/2024 2025-05-16T20:10:19.829708+02:00 lisa kernel: [ C14] RIP: 0010:queued_sp= in_lock_slowpath+0x134/0x1c0 2025-05-16T20:10:19.829710+02:00 lisa kernel: [ C14] Code: 03 c1 e6 04 8= 3 e0 fc 49 c7 c0 f8 ff ff ff 49 8b 84 40 a0 fa 98 95 48 89 94 06 c0 21 06 96 83 7a 08 00 75 08 f3 90 83 7a 08 00 <74> f8 = 48 8b 32 48 85 f6 74 09 0f 0d 0e eb 0a 31 f6 eb 06 31 f6 eb 2025-05-16T20:10:19.829714+02:00 lisa kernel: [ C14] RSP: 0018:ffffcc0dc= 201f998 EFLAGS: 00000046 2025-05-16T20:10:19.829715+02:00 lisa kernel: [ C14] RAX: 00000000000000= 00 RBX: 0000000000000286 RCX: 00000000003c0000 2025-05-16T20:10:19.829717+02:00 lisa kernel: [ C14] RDX: ffff89f82e9a31= c0 RSI: 0000000000000010 RDI: ffff89ea89ad79a8 2025-05-16T20:10:19.829718+02:00 lisa kernel: [ C14] RBP: ffff89ea05e8e0= 00 R08: fffffffffffffff8 R09: 0000000000000001 2025-05-16T20:10:19.829720+02:00 lisa kernel: [ C14] R10: 00000000000000= 01 R11: ffffffff951f07f0 R12: ffff89ea89ad7990 2025-05-16T20:10:19.829722+02:00 lisa kernel: [ C14] R13: ffff89e9e17a24= 80 R14: ffff89ea89ad79a8 R15: ffff89ea89ad79a8 2025-05-16T20:10:19.829723+02:00 lisa kernel: [ C14] FS: 00000000000000= 00(0000) GS:ffff89f898941000(0000) knlGS:0000000000000000 2025-05-16T20:10:19.829735+02:00 lisa kernel: [ C14] CS: 0010 DS: 0000 = ES: 0000 CR0: 0000000080050033 2025-05-16T20:10:19.829737+02:00 lisa kernel: [ C14] CR2: 00007f522c1f70= 00 CR3: 00000007e5a3a000 CR4: 0000000000750ef0 2025-05-16T20:10:19.829738+02:00 lisa kernel: [ C14] PKRU: 55555554 2025-05-16T20:10:19.829740+02:00 lisa kernel: [ C14] Call Trace: 2025-05-16T20:10:19.829741+02:00 lisa kernel: [ C14] 2025-05-16T20:10:19.829743+02:00 lisa kernel: [ C14] _raw_spin_lock_irq= save+0x57/0x60 2025-05-16T20:10:19.829744+02:00 lisa kernel: [ C14] rt_spin_lock+0x73/= 0xa0 2025-05-16T20:10:19.829745+02:00 lisa kernel: [ C14] sock_queue_err_skb= +0xdc/0x140 2025-05-16T20:10:19.829773+02:00 lisa kernel: [ C14] skb_complete_wifi_= ack+0xa9/0x120 2025-05-16T20:10:19.829775+02:00 lisa kernel: [ C14] ieee80211_report_u= sed_skb+0x541/0x6e0 [mac80211] 2025-05-16T20:10:19.829786+02:00 lisa kernel: [ C14] ? srso_alias_retur= n_thunk+0x5/0xfbef5 2025-05-16T20:10:19.829816+02:00 lisa kernel: [ C14] ? __schedule+0x506= /0x1280 2025-05-16T20:10:19.829822+02:00 lisa kernel: [ C14] ? preempt_schedule= _irq+0x42/0x80 2025-05-16T20:10:19.829823+02:00 lisa kernel: [ C14] ieee80211_tx_statu= s_ext+0x3b3/0x870 [mac80211] 2025-05-16T20:10:19.829824+02:00 lisa kernel: [ C14] ? srso_alias_retur= n_thunk+0x5/0xfbef5 2025-05-16T20:10:19.829826+02:00 lisa kernel: [ C14] ? rt_spin_lock+0x3= d/0xa0 2025-05-16T20:10:19.829828+02:00 lisa kernel: [ C14] ? mt76_tx_status_u= nlock+0x38/0x230 [mt76] 2025-05-16T20:10:19.829829+02:00 lisa kernel: [ C14] mt76_tx_status_unl= ock+0x1e0/0x230 [mt76] 2025-05-16T20:10:19.829830+02:00 lisa kernel: [ C14] __mt76_tx_complete= _skb+0x13b/0x2e0 [mt76] 2025-05-16T20:10:19.829832+02:00 lisa kernel: [ C14] ? srso_alias_retur= n_thunk+0x5/0xfbef5 2025-05-16T20:10:19.829833+02:00 lisa kernel: [ C14] ? rt_spin_unlock+0= x12/0x40 2025-05-16T20:10:19.829834+02:00 lisa kernel: [ C14] ? srso_alias_retur= n_thunk+0x5/0xfbef5 2025-05-16T20:10:19.829836+02:00 lisa kernel: [ C14] mt76_connac2_txwi_= free+0x127/0x150 [mt76_connac_lib] 2025-05-16T20:10:19.829838+02:00 lisa kernel: [ C14] mt7921_mac_tx_free= +0x112/0x260 [mt7921_common] 2025-05-16T20:10:19.829839+02:00 lisa kernel: [ C14] mt7921_rx_check+0x= 33/0xe0 [mt7921_common] 2025-05-16T20:10:19.829841+02:00 lisa kernel: [ C14] mt76_dma_rx_poll+0= x322/0x660 [mt76] 2025-05-16T20:10:19.829842+02:00 lisa kernel: [ C14] ? mt792x_poll_rx+0= x2a/0x120 [mt792x_lib] 2025-05-16T20:10:19.829843+02:00 lisa kernel: [ C14] mt792x_poll_rx+0x7= 1/0x120 [mt792x_lib] 2025-05-16T20:10:19.829845+02:00 lisa kernel: [ C14] __napi_poll+0x2a/0= x170 2025-05-16T20:10:19.829846+02:00 lisa kernel: [ C14] ? napi_threaded_po= ll_loop+0x32/0x1b0 2025-05-16T20:10:19.829848+02:00 lisa kernel: [ C14] napi_threaded_poll= _loop+0xe4/0x1b0 2025-05-16T20:10:19.829849+02:00 lisa kernel: [ C14] ? napi_threaded_po= ll_loop+0x32/0x1b0 2025-05-16T20:10:19.829851+02:00 lisa kernel: [ C14] ? ttwu_do_activate= +0xa9/0x1a0 2025-05-16T20:10:19.829863+02:00 lisa kernel: [ C14] ? srso_alias_retur= n_thunk+0x5/0xfbef5 2025-05-16T20:10:19.829864+02:00 lisa kernel: [ C14] napi_threaded_poll= +0x57/0x80 2025-05-16T20:10:19.829866+02:00 lisa kernel: [ C14] ? __pfx_napi_threa= ded_poll+0x10/0x10 2025-05-16T20:10:19.829867+02:00 lisa kernel: [ C14] kthread+0x25c/0x28= 0 2025-05-16T20:10:19.829868+02:00 lisa kernel: [ C14] ? __pfx_kthread+0x= 10/0x10 2025-05-16T20:10:19.829871+02:00 lisa kernel: [ C14] ret_from_fork+0xc4= /0x1b0 2025-05-16T20:10:19.829873+02:00 lisa kernel: [ C14] ? __pfx_kthread+0x= 10/0x10 2025-05-16T20:10:19.829874+02:00 lisa kernel: [ C14] ret_from_fork_asm+= 0x1a/0x30 2025-05-16T20:10:19.829875+02:00 lisa kernel: [ C14] Bert Karwatzki