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Message-ID: <CANn89iKyWgYeD_B-iJxL50C4BHYiDh+dWOyFYXatteF=eU7zoA@mail.gmail.com>
Date: Tue, 30 Mar 2021 15:39:32 +0200
From: Eric Dumazet <edumazet@...gle.com>
To: Martin Zaharinov <micron10@...il.com>
Cc: Wei Wang <weiwan@...gle.com>,
"David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
netdev <netdev@...r.kernel.org>,
Alexander Duyck <alexanderduyck@...com>,
Paolo Abeni <pabeni@...hat.com>,
Hannes Frederic Sowa <hannes@...essinduktion.org>
Subject: Re: [PATCH net v4] net: fix race between napi kthread mode and busy poll
On Tue, Mar 30, 2021 at 11:25 AM Martin Zaharinov <micron10@...il.com> wrote:
>
> Hi Eric and Wei
>
> Please check this log :
>
Please send a normal report to netdev.
This has nothing to to with us (Eric & Wei)
Thanks.
>
> 1584288.951272] napi/eth0-523: page allocation failure: order:0, mode:0x40a20(GFP_ATOMIC|__GFP_COMP), nodemask=(null)
> [1584289.003674] CPU: 4 PID: 3179 Comm: napi/eth0-523 Tainted: G O 5.11.4 #1
> [1584289.055545] Hardware name: Supermicro SYS-5038MR-H8TRF/X10SRD-F, BIOS 3.2 11/22/2019
> [1584289.107263] Call Trace:
> [1584289.107266] dump_stack+0x58/0x6b
> [1584289.209562] warn_alloc.cold+0x70/0xd4
> [1584289.209569] __alloc_pages_slowpath.constprop.0+0xd57/0xfb0
> [1584289.209574] __alloc_pages_nodemask+0x15a/0x180
> [1584289.474009] allocate_slab+0x272/0x450
> [1584289.496731] ___slab_alloc.constprop.0+0x41e/0x4d0
> [1584289.519147] kmem_cache_alloc+0x110/0x120
> [1584289.541416] build_skb+0x1a/0x200
> [1584289.563121] ixgbe_clean_rx_irq+0x5fc/0xa10 [ixgbe]
> [1584289.584618] ixgbe_poll+0xeb/0x2a0 [ixgbe]
> [1584289.605528] __napi_poll+0x1f/0x130
> [1584289.625842] napi_threaded_poll+0x110/0x160
> [1584289.646110] ? __napi_poll+0x130/0x130
> [1584289.665810] kthread+0xea/0x120
> [1584289.684836] ? kthread_park+0x80/0x80
> [1584289.703440] ret_from_fork+0x1f/0x30
> [1584289.721616] Mem-Info:
> [1584289.739066] active_anon:8157 inactive_anon:2100191 isolated_anon:0
> active_file:17408 inactive_file:149 isolated_file:32
> unevictable:1440359 dirty:17500 writeback:0
> slab_reclaimable:43368 slab_unreclaimable:155124
> mapped:817431 shmem:7650 pagetables:32093 bounce:0
> free:17832 free_pcp:113 free_cma:0
> [1584289.842614] Node 0 active_anon:32628kB inactive_anon:8400764kB active_file:69312kB inactive_file:880kB unevictable:5761436kB isolated(anon):0kB isolated(file):128kB mapped:3269724kB dirty:69740kB writeback:0kB shmem:30600kB writeback_tmp:0kB kernel_stack:5376kB pagetables:128372kB all_unreclaimable? no
> [1584289.913793] Node 0 DMA free:13836kB min:12kB low:24kB high:36kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15968kB managed:15884kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [1584289.986882] lowmem_reserve[]: 0 1741 15726 15726
> [1584290.005519] Node 0 DMA32 free:54448kB min:9780kB low:11560kB high:13340kB reserved_highatomic:24576KB active_anon:5104kB inactive_anon:760844kB active_file:51532kB inactive_file:388kB unevictable:885428kB writepending:51744kB present:1965124kB managed:1899588kB mlocked:0kB bounce:0kB free_pcp:684kB local_pcp:0kB free_cma:0kB
> [1584290.104980] lowmem_reserve[]: 0 0 13985 13985
> [1584290.125807] Node 0 Normal free:2288kB min:78608kB low:92928kB high:107248kB reserved_highatomic:32768KB active_anon:27524kB inactive_anon:7639920kB active_file:17776kB inactive_file:1304kB unevictable:4876016kB writepending:17736kB present:14680064kB managed:14326620kB mlocked:0kB bounce:0kB free_pcp:288kB local_pcp:28kB free_cma:0kB
> [1584290.237051] lowmem_reserve[]: 0 0 0 0
> [1584290.260423] Node 0 DMA: 1*4kB (U) 1*8kB (U) 0*16kB 0*32kB 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 0*2048kB 3*4096kB (M) = 13836kB
> [1584290.308847] Node 0 DMA32: 12500*4kB (UMEH) 553*8kB (MH) 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 54424kB
> [1584290.358363] Node 0 Normal: 0*4kB 25*8kB (H) 0*16kB 5*32kB (H) 1*64kB (H) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 424kB
> [1584290.409087] 1465768 total pagecache pages
> [1584290.434531] 4165289 pages RAM
> [1584290.459616] 0 pages HighMem/MovableOnly
> [1584290.484480] 104766 pages reserved
> [1584290.508709] 0 pages hwpoisoned
> [1584301.710231] team0: Failed to send options change via netlink (err -105)
> [1584302.635731] telegraf invoked oom-killer: gfp_mask=0x400dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), order=1, oom_score_adj=0
> [1584302.682874] CPU: 0 PID: 3494492 Comm: telegraf Tainted: G O 5.11.4 #1
> [1584302.729535] Hardware name: Supermicro SYS-5038MR-H8TRF/X10SRD-F, BIOS 3.2 11/22/2019
> [1584302.776532] Call Trace:
> [1584302.799361] dump_stack+0x58/0x6b
> [1584302.821791] dump_header+0x4c/0x2e6
> [1584302.843580] oom_kill_process.cold+0xb/0x10
> [1584302.865223] out_of_memory.part.0+0x125/0x5f0
> [1584302.886641] out_of_memory+0x54/0xa0
> [1584302.907302] __alloc_pages_slowpath.constprop.0+0xb03/0xfb0
> [1584302.927913] __alloc_pages_nodemask+0x15a/0x180
> [1584302.947874] __get_free_pages+0x8/0x30
> [1584302.967246] pgd_alloc+0x21/0x180
> [1584302.986355] mm_alloc+0x1af/0x250
> [1584303.005085] alloc_bprm+0x80/0x2a0
> [1584303.023328] do_execveat_common+0x8b/0x330
> [1584303.041181] __x64_sys_execve+0x2b/0x40
> [1584303.058513] do_syscall_64+0x2d/0x40
> [1584303.075281] entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [1584303.091891] RIP: 0033:0x488376
> [1584303.108045] Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 1b 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
> [1584303.159632] RSP: 002b:000000c001108528 EFLAGS: 00000206 ORIG_RAX: 000000000000003b
> [1584303.195446] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000488376
> [1584303.231451] RDX: 000000c002b1a080 RSI: 000000c0028432e0 RDI: 000000c000cae660
> [1584303.267407] RBP: 000000c0011086c8 R08: 0000000000000018 R09: 0000000000000000
> [1584303.303594] R10: 0000000000000008 R11: 0000000000000206 R12: 000000000047f258
> [1584303.340218] R13: 000000000000000e R14: 000000000000000d R15: 0000000000000100
> [1584303.379094] Mem-Info:
> [1584303.398713] active_anon:8159 inactive_anon:2138194 isolated_anon:0
> active_file:12975 inactive_file:168 isolated_file:32
> unevictable:909709 dirty:12864 writeback:10
> slab_reclaimable:42415 slab_unreclaimable:154783
> mapped:39825 shmem:14744 pagetables:26041 bounce:0
> free:537002 free_pcp:1813 free_cma:0
> [1584303.547011] Node 0 active_anon:32636kB inactive_anon:8552776kB active_file:51476kB inactive_file:1112kB unevictable:3638836kB isolated(anon):0kB isolated(file):128kB mapped:159480kB dirty:51024kB writeback:28kB shmem:58976kB writeback_tmp:0kB kernel_stack:5392kB pagetables:104164kB all_unreclaimable? no
> [1584303.640025] Node 0 DMA free:13428kB min:12kB low:24kB high:36kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15968kB managed:15884kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [1584303.739414] lowmem_reserve[]: 0 1741 15726 15726
> [1584303.764535] Node 0 DMA32 free:121320kB min:5872kB low:7652kB high:9432kB reserved_highatomic:24576KB active_anon:5104kB inactive_anon:761140kB active_file:37160kB inactive_file:772kB unevictable:885428kB writepending:37672kB present:1965124kB managed:1899588kB mlocked:0kB bounce:0kB free_pcp:1448kB local_pcp:0kB free_cma:0kB
> [1584303.888935] lowmem_reserve[]: 0 0 13985 13985
> [1584303.913532] Node 0 Normal free:1970692kB min:78608kB low:92928kB high:107248kB reserved_highatomic:126976KB active_anon:27524kB inactive_anon:7812248kB active_file:13664kB inactive_file:1528kB unevictable:2753408kB writepending:12888kB present:14680064kB managed:14326620kB mlocked:0kB bounce:0kB free_pcp:4076kB local_pcp:0kB free_cma:0kB
> [1584304.036531] lowmem_reserve[]: 0 0 0 0
> [1584304.060733] Node 0 DMA: 1*4kB (U) 40*8kB (U) 37*16kB (U) 32*32kB (U) 24*64kB (U) 14*128kB (U) 8*256kB (U) 2*512kB (U) 1*1024kB (U) 0*2048kB 1*4096kB (M) = 13460kB
> [1584304.134551] Node 0 DMA32: 15098*4kB (UMEH) 6204*8kB (UMEH) 662*16kB (UMEH) 20*32kB (UMEH) 1*64kB (U) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 121320kB
> [1584304.209349] Node 0 Normal: 1038*4kB (UEH) 392*8kB (EH) 56*16kB (UEH) 28*32kB (UEH) 14*64kB (MEH) 25*128kB (MEH) 6*256kB (MH) 3*512kB (UMH) 3*1024kB (MH) 5*2048kB (UMH) 472*4096kB (U) = 1962872kB
> [1584304.287094] 933871 total pagecache pages
> [1584304.312815] 4165289 pages RAM
> [1584304.337915] 0 pages HighMem/MovableOnly
> [1584304.362522] 104766 pages reserved
> [1584304.386516] 0 pages hwpoisoned
>
> > On 20 Mar 2021, at 11:55, Eric Dumazet <edumazet@...gle.com> wrote:
> >
> > On Sat, Mar 20, 2021 at 9:45 AM Martin Zaharinov <micron10@...il.com> wrote:
> >>
> >> Hi Wei
> >> Check this:
> >>
> >> [ 39.706567] ------------[ cut here ]------------
> >> [ 39.706568] RTNL: assertion failed at net/ipv4/udp_tunnel_nic.c (557)
> >> [ 39.706585] WARNING: CPU: 0 PID: 429 at net/ipv4/udp_tunnel_nic.c:557 __udp_tunnel_nic_reset_ntf+0xea/0x100
> >
> > Probably more relevant to Intel maintainers than Wei :/
> >
> >> [ 39.706594] Modules linked in: i40e(+) nf_nat_sip nf_conntrack_sip nf_nat_pptp nf_conntrack_pptp nf_nat_tftp nf_conntrack_tftp nf_nat_ftp nf_conntrack_ftp nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 acpi_ipmi ipmi_si ipmi_devintf ipmi_msghandler rtc_cmos megaraid_sas
> >> [ 39.706614] CPU: 0 PID: 429 Comm: kworker/0:2 Tainted: G O 5.11.7 #1
> >> [ 39.706618] Hardware name: Supermicro X11DPi-N(T)/X11DPi-NT, BIOS 3.4 11/23/2020
> >> [ 39.706619] Workqueue: events work_for_cpu_fn
> >> [ 39.706627] RIP: 0010:__udp_tunnel_nic_reset_ntf+0xea/0x100
> >> [ 39.706631] Code: c0 79 f1 00 00 0f 85 4e ff ff ff ba 2d 02 00 00 48 c7 c6 45 3c 3a 93 48 c7 c7 40 de 39 93 c6 05 a0 79 f1 00 01 e8 f5 ad 0c 00 <0f> 0b e9 28 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00
> >> [ 39.706634] RSP: 0018:ffffa8390d9b3b38 EFLAGS: 00010292
> >> [ 39.706637] RAX: 0000000000000039 RBX: ffff8e02630b2768 RCX: 00000000ffdfffff
> >> [ 39.706639] RDX: 00000000ffdfffff RSI: ffff8e80ad400000 RDI: 0000000000000001
> >> [ 39.706641] RBP: ffff8e025df72000 R08: ffff8e80bb3fffe8 R09: 00000000ffffffea
> >> [ 39.706643] R10: 00000000ffdfffff R11: 80000000ffe00000 R12: ffff8e02630b2008
> >> [ 39.706645] R13: 0000000000000000 R14: ffff8e024a88ba00 R15: 0000000000000000
> >> [ 39.706646] FS: 0000000000000000(0000) GS:ffff8e40bf800000(0000) knlGS:0000000000000000
> >> [ 39.706649] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >> [ 39.706651] CR2: 00000000004d8f40 CR3: 0000002ca140a002 CR4: 00000000001706f0
> >> [ 39.706652] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> >> [ 39.706654] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> >> [ 39.706656] Call Trace:
> >> [ 39.706658] i40e_setup_pf_switch+0x617/0xf80 [i40e]
> >> [ 39.706683] i40e_probe.part.0.cold+0x8dc/0x109e [i40e]
> >> [ 39.706708] ? acpi_ns_check_object_type+0xd4/0x193
> >> [ 39.706713] ? acpi_ns_check_package_list+0xfd/0x205
> >> [ 39.706716] ? __kmalloc+0x37/0x160
> >> [ 39.706720] ? kmem_cache_alloc+0xcb/0x120
> >> [ 39.706723] ? irq_get_irq_data+0x5/0x20
> >> [ 39.706726] ? mp_check_pin_attr+0xe/0xf0
> >> [ 39.706729] ? irq_get_irq_data+0x5/0x20
> >> [ 39.706731] ? mp_map_pin_to_irq+0xb7/0x2c0
> >> [ 39.706735] ? acpi_register_gsi_ioapic+0x86/0x150
> >> [ 39.706739] ? pci_conf1_read+0x9f/0xf0
> >> [ 39.706743] ? pci_bus_read_config_word+0x2e/0x40
> >> [ 39.706746] local_pci_probe+0x1b/0x40
> >> [ 39.706750] work_for_cpu_fn+0xb/0x20
> >> [ 39.706754] process_one_work+0x1ec/0x350
> >> [ 39.706758] worker_thread+0x24b/0x4d0
> >> [ 39.706760] ? process_one_work+0x350/0x350
> >> [ 39.706762] kthread+0xea/0x120
> >> [ 39.706766] ? kthread_park+0x80/0x80
> >> [ 39.706770] ret_from_fork+0x1f/0x30
> >> [ 39.706774] ---[ end trace 7a203f3ec972a377 ]---
> >>
> >> Martin
> >>
> >>
> >>> On 17 Mar 2021, at 0:36, Wei Wang <weiwan@...gle.com> wrote:
> >>>
> >>> Currently, napi_thread_wait() checks for NAPI_STATE_SCHED bit to
> >>> determine if the kthread owns this napi and could call napi->poll() on
> >>> it. However, if socket busy poll is enabled, it is possible that the
> >>> busy poll thread grabs this SCHED bit (after the previous napi->poll()
> >>> invokes napi_complete_done() and clears SCHED bit) and tries to poll
> >>> on the same napi. napi_disable() could grab the SCHED bit as well.
> >>> This patch tries to fix this race by adding a new bit
> >>> NAPI_STATE_SCHED_THREADED in napi->state. This bit gets set in
> >>> ____napi_schedule() if the threaded mode is enabled, and gets cleared
> >>> in napi_complete_done(), and we only poll the napi in kthread if this
> >>> bit is set. This helps distinguish the ownership of the napi between
> >>> kthread and other scenarios and fixes the race issue.
> >>>
> >>> Fixes: 29863d41bb6e ("net: implement threaded-able napi poll loop support")
> >>> Reported-by: Martin Zaharinov <micron10@...il.com>
> >>> Suggested-by: Jakub Kicinski <kuba@...nel.org>
> >>> Signed-off-by: Wei Wang <weiwan@...gle.com>
> >>> Cc: Alexander Duyck <alexanderduyck@...com>
> >>> Cc: Eric Dumazet <edumazet@...gle.com>
> >>> Cc: Paolo Abeni <pabeni@...hat.com>
> >>> Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
> >>> ---
> >>> Change since v3:
> >>> - Add READ_ONCE() for thread->state and add comments in
> >>> ____napi_schedule().
> >>>
> >>> include/linux/netdevice.h | 2 ++
> >>> net/core/dev.c | 19 ++++++++++++++++++-
> >>> 2 files changed, 20 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
> >>> index 5b67ea89d5f2..87a5d186faff 100644
> >>> --- a/include/linux/netdevice.h
> >>> +++ b/include/linux/netdevice.h
> >>> @@ -360,6 +360,7 @@ enum {
> >>> NAPI_STATE_IN_BUSY_POLL, /* sk_busy_loop() owns this NAPI */
> >>> NAPI_STATE_PREFER_BUSY_POLL, /* prefer busy-polling over softirq processing*/
> >>> NAPI_STATE_THREADED, /* The poll is performed inside its own thread*/
> >>> + NAPI_STATE_SCHED_THREADED, /* Napi is currently scheduled in threaded mode */
> >>> };
> >>>
> >>> enum {
> >>> @@ -372,6 +373,7 @@ enum {
> >>> NAPIF_STATE_IN_BUSY_POLL = BIT(NAPI_STATE_IN_BUSY_POLL),
> >>> NAPIF_STATE_PREFER_BUSY_POLL = BIT(NAPI_STATE_PREFER_BUSY_POLL),
> >>> NAPIF_STATE_THREADED = BIT(NAPI_STATE_THREADED),
> >>> + NAPIF_STATE_SCHED_THREADED = BIT(NAPI_STATE_SCHED_THREADED),
> >>> };
> >>>
> >>> enum gro_result {
> >>> diff --git a/net/core/dev.c b/net/core/dev.c
> >>> index 6c5967e80132..d3195a95f30e 100644
> >>> --- a/net/core/dev.c
> >>> +++ b/net/core/dev.c
> >>> @@ -4294,6 +4294,13 @@ static inline void ____napi_schedule(struct softnet_data *sd,
> >>> */
> >>> thread = READ_ONCE(napi->thread);
> >>> if (thread) {
> >>> + /* Avoid doing set_bit() if the thread is in
> >>> + * INTERRUPTIBLE state, cause napi_thread_wait()
> >>> + * makes sure to proceed with napi polling
> >>> + * if the thread is explicitly woken from here.
> >>> + */
> >>> + if (READ_ONCE(thread->state) != TASK_INTERRUPTIBLE)
> >>> + set_bit(NAPI_STATE_SCHED_THREADED, &napi->state);
> >>> wake_up_process(thread);
> >>> return;
> >>> }
> >>> @@ -6486,6 +6493,7 @@ bool napi_complete_done(struct napi_struct *n, int work_done)
> >>> WARN_ON_ONCE(!(val & NAPIF_STATE_SCHED));
> >>>
> >>> new = val & ~(NAPIF_STATE_MISSED | NAPIF_STATE_SCHED |
> >>> + NAPIF_STATE_SCHED_THREADED |
> >>> NAPIF_STATE_PREFER_BUSY_POLL);
> >>>
> >>> /* If STATE_MISSED was set, leave STATE_SCHED set,
> >>> @@ -6968,16 +6976,25 @@ static int napi_poll(struct napi_struct *n, struct list_head *repoll)
> >>>
> >>> static int napi_thread_wait(struct napi_struct *napi)
> >>> {
> >>> + bool woken = false;
> >>> +
> >>> set_current_state(TASK_INTERRUPTIBLE);
> >>>
> >>> while (!kthread_should_stop() && !napi_disable_pending(napi)) {
> >>> - if (test_bit(NAPI_STATE_SCHED, &napi->state)) {
> >>> + /* Testing SCHED_THREADED bit here to make sure the current
> >>> + * kthread owns this napi and could poll on this napi.
> >>> + * Testing SCHED bit is not enough because SCHED bit might be
> >>> + * set by some other busy poll thread or by napi_disable().
> >>> + */
> >>> + if (test_bit(NAPI_STATE_SCHED_THREADED, &napi->state) || woken) {
> >>> WARN_ON(!list_empty(&napi->poll_list));
> >>> __set_current_state(TASK_RUNNING);
> >>> return 0;
> >>> }
> >>>
> >>> schedule();
> >>> + /* woken being true indicates this thread owns this napi. */
> >>> + woken = true;
> >>> set_current_state(TASK_INTERRUPTIBLE);
> >>> }
> >>> __set_current_state(TASK_RUNNING);
> >>> --
> >>> 2.31.0.rc2.261.g7f71774620-goog
> >>>
> >>
>
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