* [PATCH net-next 1/3] ipv6: snmp: remove icmp6type2name[]
2025-09-04 13:25 [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST Eric Dumazet
@ 2025-09-04 13:25 ` Eric Dumazet
2025-09-04 13:25 ` [PATCH net-next 2/3] ipv6: snmp: do not use SNMP_MIB_SENTINEL anymore Eric Dumazet
` (2 subsequent siblings)
3 siblings, 0 replies; 6+ messages in thread
From: Eric Dumazet @ 2025-09-04 13:25 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski, Paolo Abeni
Cc: Simon Horman, David Ahern, Jamie Bainbridge, Abhishek Rawal,
netdev, eric.dumazet, Eric Dumazet
This 2KB array can be replaced by a switch() to save space.
Before:
$ size net/ipv6/proc.o
text data bss dec hex filename
6410 624 0 7034 1b7a net/ipv6/proc.o
After:
$ size net/ipv6/proc.o
text data bss dec hex filename
5516 592 0 6108 17dc net/ipv6/proc.o
Signed-off-by: Eric Dumazet <edumazet@google.com>
---
net/ipv6/proc.c | 44 ++++++++++++++++++++++----------------------
1 file changed, 22 insertions(+), 22 deletions(-)
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 752327b10dde..e96f14a36834 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -99,26 +99,6 @@ static const struct snmp_mib snmp6_icmp6_list[] = {
SNMP_MIB_SENTINEL
};
-/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
-static const char *const icmp6type2name[256] = {
- [ICMPV6_DEST_UNREACH] = "DestUnreachs",
- [ICMPV6_PKT_TOOBIG] = "PktTooBigs",
- [ICMPV6_TIME_EXCEED] = "TimeExcds",
- [ICMPV6_PARAMPROB] = "ParmProblems",
- [ICMPV6_ECHO_REQUEST] = "Echos",
- [ICMPV6_ECHO_REPLY] = "EchoReplies",
- [ICMPV6_MGM_QUERY] = "GroupMembQueries",
- [ICMPV6_MGM_REPORT] = "GroupMembResponses",
- [ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
- [ICMPV6_MLD2_REPORT] = "MLDv2Reports",
- [NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
- [NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
- [NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
- [NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
- [NDISC_REDIRECT] = "Redirects",
-};
-
-
static const struct snmp_mib snmp6_udp6_list[] = {
SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
@@ -151,11 +131,31 @@ static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
/* print by name -- deprecated items */
for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
+ const char *p = NULL;
int icmptype;
- const char *p;
+
+#define CASE(TYP, STR) case TYP: p = STR; break;
icmptype = i & 0xff;
- p = icmp6type2name[icmptype];
+ switch (icmptype) {
+/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
+ CASE(ICMPV6_DEST_UNREACH, "DestUnreachs")
+ CASE(ICMPV6_PKT_TOOBIG, "PktTooBigs")
+ CASE(ICMPV6_TIME_EXCEED, "TimeExcds")
+ CASE(ICMPV6_PARAMPROB, "ParmProblems")
+ CASE(ICMPV6_ECHO_REQUEST, "Echos")
+ CASE(ICMPV6_ECHO_REPLY, "EchoReplies")
+ CASE(ICMPV6_MGM_QUERY, "GroupMembQueries")
+ CASE(ICMPV6_MGM_REPORT, "GroupMembResponses")
+ CASE(ICMPV6_MGM_REDUCTION, "GroupMembReductions")
+ CASE(ICMPV6_MLD2_REPORT, "MLDv2Reports")
+ CASE(NDISC_ROUTER_ADVERTISEMENT, "RouterAdvertisements")
+ CASE(NDISC_ROUTER_SOLICITATION, "RouterSolicits")
+ CASE(NDISC_NEIGHBOUR_ADVERTISEMENT, "NeighborAdvertisements")
+ CASE(NDISC_NEIGHBOUR_SOLICITATION, "NeighborSolicits")
+ CASE(NDISC_REDIRECT, "Redirects")
+ }
+#undef CASE
if (!p) /* don't print un-named types here */
continue;
snprintf(name, sizeof(name), "Icmp6%s%s",
--
2.51.0.338.gd7d06c2dae-goog
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH net-next 2/3] ipv6: snmp: do not use SNMP_MIB_SENTINEL anymore
2025-09-04 13:25 [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST Eric Dumazet
2025-09-04 13:25 ` [PATCH net-next 1/3] ipv6: snmp: remove icmp6type2name[] Eric Dumazet
@ 2025-09-04 13:25 ` Eric Dumazet
2025-09-04 13:25 ` [PATCH net-next 3/3] ipv6: snmp: do not track per idev ICMP6_MIB_RATELIMITHOST Eric Dumazet
2025-09-04 16:24 ` [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST Jakub Kicinski
3 siblings, 0 replies; 6+ messages in thread
From: Eric Dumazet @ 2025-09-04 13:25 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski, Paolo Abeni
Cc: Simon Horman, David Ahern, Jamie Bainbridge, Abhishek Rawal,
netdev, eric.dumazet, Eric Dumazet
Use ARRAY_SIZE(), so that we know the limit at compile time.
Following patch needs this preliminary change.
Signed-off-by: Eric Dumazet <edumazet@google.com>
---
include/net/ip.h | 11 +++++++++++
net/ipv6/proc.c | 39 ++++++++++++++++++++++-----------------
2 files changed, 33 insertions(+), 17 deletions(-)
diff --git a/include/net/ip.h b/include/net/ip.h
index 6dbd2bf8fa9c..856e62aae036 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -349,6 +349,17 @@ static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_o
} \
}
+#define snmp_get_cpu_field_batch_cnt(buff, stats_list, cnt, mib_statistic) \
+{ \
+ int i, c; \
+ for_each_possible_cpu(c) { \
+ for (i = 0; i < cnt; i++) \
+ buff[i] += snmp_get_cpu_field( \
+ mib_statistic, \
+ c, stats_list[i].entry); \
+ } \
+}
+
static inline void inet_get_local_port_range(const struct net *net, int *low, int *high)
{
u32 range = READ_ONCE(net->ipv4.ip_local_ports.range);
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index e96f14a36834..6dc06a11e05a 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -85,7 +85,6 @@ static const struct snmp_mib snmp6_ipstats_list[] = {
SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
SNMP_MIB_ITEM("Ip6OutTransmits", IPSTATS_MIB_OUTPKTS),
- SNMP_MIB_SENTINEL
};
static const struct snmp_mib snmp6_icmp6_list[] = {
@@ -96,7 +95,6 @@ static const struct snmp_mib snmp6_icmp6_list[] = {
SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
SNMP_MIB_ITEM("Icmp6OutRateLimitHost", ICMP6_MIB_RATELIMITHOST),
- SNMP_MIB_SENTINEL
};
static const struct snmp_mib snmp6_udp6_list[] = {
@@ -109,7 +107,6 @@ static const struct snmp_mib snmp6_udp6_list[] = {
SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
SNMP_MIB_ITEM("Udp6MemErrors", UDP_MIB_MEMERRORS),
- SNMP_MIB_SENTINEL
};
static const struct snmp_mib snmp6_udplite6_list[] = {
@@ -121,7 +118,6 @@ static const struct snmp_mib snmp6_udplite6_list[] = {
SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
SNMP_MIB_ITEM("UdpLite6MemErrors", UDP_MIB_MEMERRORS),
- SNMP_MIB_SENTINEL
};
static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
@@ -182,27 +178,29 @@ static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
*/
static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
atomic_long_t *smib,
- const struct snmp_mib *itemlist)
+ const struct snmp_mib *itemlist,
+ int cnt)
{
unsigned long buff[SNMP_MIB_MAX];
int i;
if (pcpumib) {
- memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
+ memset(buff, 0, sizeof(unsigned long) * cnt);
- snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
- for (i = 0; itemlist[i].name; i++)
+ snmp_get_cpu_field_batch_cnt(buff, itemlist, cnt, pcpumib);
+ for (i = 0; i < cnt; i++)
seq_printf(seq, "%-32s\t%lu\n",
itemlist[i].name, buff[i]);
} else {
- for (i = 0; itemlist[i].name; i++)
+ for (i = 0; i < cnt; i++)
seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
atomic_long_read(smib + itemlist[i].entry));
}
}
static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
- const struct snmp_mib *itemlist, size_t syncpoff)
+ const struct snmp_mib *itemlist,
+ int cnt, size_t syncpoff)
{
u64 buff64[SNMP_MIB_MAX];
int i;
@@ -210,7 +208,7 @@ static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);
snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
- for (i = 0; itemlist[i].name; i++)
+ for (i = 0; i < cnt; i++)
seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
}
@@ -219,14 +217,19 @@ static int snmp6_seq_show(struct seq_file *seq, void *v)
struct net *net = (struct net *)seq->private;
snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
- snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
+ snmp6_ipstats_list,
+ ARRAY_SIZE(snmp6_ipstats_list),
+ offsetof(struct ipstats_mib, syncp));
snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
- NULL, snmp6_icmp6_list);
+ NULL, snmp6_icmp6_list,
+ ARRAY_SIZE(snmp6_icmp6_list));
snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
- NULL, snmp6_udp6_list);
+ NULL, snmp6_udp6_list,
+ ARRAY_SIZE(snmp6_udp6_list));
snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
- NULL, snmp6_udplite6_list);
+ NULL, snmp6_udplite6_list,
+ ARRAY_SIZE(snmp6_udplite6_list));
return 0;
}
@@ -236,9 +239,11 @@ static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
snmp6_seq_show_item64(seq, idev->stats.ipv6,
- snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
+ snmp6_ipstats_list,
+ ARRAY_SIZE(snmp6_ipstats_list),
+ offsetof(struct ipstats_mib, syncp));
snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
- snmp6_icmp6_list);
+ snmp6_icmp6_list, ARRAY_SIZE(snmp6_icmp6_list));
snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
return 0;
}
--
2.51.0.338.gd7d06c2dae-goog
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH net-next 3/3] ipv6: snmp: do not track per idev ICMP6_MIB_RATELIMITHOST
2025-09-04 13:25 [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST Eric Dumazet
2025-09-04 13:25 ` [PATCH net-next 1/3] ipv6: snmp: remove icmp6type2name[] Eric Dumazet
2025-09-04 13:25 ` [PATCH net-next 2/3] ipv6: snmp: do not use SNMP_MIB_SENTINEL anymore Eric Dumazet
@ 2025-09-04 13:25 ` Eric Dumazet
2025-09-04 16:24 ` [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST Jakub Kicinski
3 siblings, 0 replies; 6+ messages in thread
From: Eric Dumazet @ 2025-09-04 13:25 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski, Paolo Abeni
Cc: Simon Horman, David Ahern, Jamie Bainbridge, Abhishek Rawal,
netdev, eric.dumazet, Eric Dumazet
Blamed commit added a critical false sharing on a single
atomic_long_t under DOS, like receiving UDP packets
to closed ports.
Per netns ICMP6_MIB_RATELIMITHOST tracking uses per-cpu
storage and is enough, we do not need per-device and slow tracking.
Fixes: d0941130c9351 ("icmp: Add counters for rate limits")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jamie Bainbridge <jamie.bainbridge@gmail.com>
Cc: Abhishek Rawal <rawal.abhishek92@gmail.com>
---
net/ipv6/icmp.c | 3 +--
net/ipv6/proc.c | 6 +++++-
2 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 95cdd4cacb00..56c974cf75d1 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -230,8 +230,7 @@ static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
}
rcu_read_unlock();
if (!res)
- __ICMP6_INC_STATS(net, ip6_dst_idev(dst),
- ICMP6_MIB_RATELIMITHOST);
+ __ICMP6_INC_STATS(net, NULL, ICMP6_MIB_RATELIMITHOST);
else
icmp_global_consume(net);
dst_release(dst);
diff --git a/net/ipv6/proc.c b/net/ipv6/proc.c
index 6dc06a11e05a..6e8d70b34a7e 100644
--- a/net/ipv6/proc.c
+++ b/net/ipv6/proc.c
@@ -94,6 +94,7 @@ static const struct snmp_mib snmp6_icmp6_list[] = {
SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
+/* ICMP6_MIB_RATELIMITHOST needs to be last, see snmp6_dev_seq_show(). */
SNMP_MIB_ITEM("Icmp6OutRateLimitHost", ICMP6_MIB_RATELIMITHOST),
};
@@ -242,8 +243,11 @@ static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
snmp6_ipstats_list,
ARRAY_SIZE(snmp6_ipstats_list),
offsetof(struct ipstats_mib, syncp));
+
+ /* Per idev icmp stats do not have ICMP6_MIB_RATELIMITHOST */
snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
- snmp6_icmp6_list, ARRAY_SIZE(snmp6_icmp6_list));
+ snmp6_icmp6_list, ARRAY_SIZE(snmp6_icmp6_list) - 1);
+
snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
return 0;
}
--
2.51.0.338.gd7d06c2dae-goog
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST
2025-09-04 13:25 [PATCH net-next 0/3] ipv6: snmp: avoid performance issue with RATELIMITHOST Eric Dumazet
` (2 preceding siblings ...)
2025-09-04 13:25 ` [PATCH net-next 3/3] ipv6: snmp: do not track per idev ICMP6_MIB_RATELIMITHOST Eric Dumazet
@ 2025-09-04 16:24 ` Jakub Kicinski
2025-09-04 16:32 ` Eric Dumazet
3 siblings, 1 reply; 6+ messages in thread
From: Jakub Kicinski @ 2025-09-04 16:24 UTC (permalink / raw)
To: Eric Dumazet
Cc: David S . Miller, Paolo Abeni, Simon Horman, David Ahern,
Jamie Bainbridge, Abhishek Rawal, netdev, eric.dumazet
On Thu, 4 Sep 2025 13:25:50 +0000 Eric Dumazet wrote:
> Addition of ICMP6_MIB_RATELIMITHOST in commit d0941130c9351
> ("icmp: Add counters for rate limits") introduced a performance
> drop in case of DOS (like receiving UDP packets
> to closed ports).
>
> Per netns ICMP6_MIB_RATELIMITHOST tracking uses per-cpu
> storage and is enough, we do not need per-device and slow tracking
> for this metric.
CI says:
==================================================================
[ 156.608382][ T330] BUG: KASAN: global-out-of-bounds in snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211)
[ 156.608699][ T330] Read of size 8 at addr ffffffffad4d4790 by task connect-deny_ip/330
[ 156.608965][ T330]
[ 156.609064][ T330] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 156.609066][ T330] Call Trace:
[ 156.609069][ T330] <TASK>
[ 156.609071][ T330] dump_stack_lvl (lib/dump_stack.c:123)
[ 156.609077][ T330] print_address_description.constprop.0 (mm/kasan/report.c:379)
[ 156.609084][ T330] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211)
[ 156.609088][ T330] print_report (mm/kasan/report.c:483)
[ 156.609091][ T330] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211)
[ 156.609094][ T330] ? kasan_addr_to_slab (./include/linux/mm.h:1180 mm/kasan/../slab.h:187 mm/kasan/common.c:38)
[ 156.609098][ T330] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211)
[ 156.609101][ T330] kasan_report (mm/kasan/report.c:597)
[ 156.609105][ T330] ? snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211)
[ 156.609111][ T330] snmp6_seq_show_item64.constprop.0 (net/ipv6/proc.c:211)
[ 156.609119][ T330] ? sockstat6_seq_show (net/ipv6/proc.c:202)
[ 156.609137][ T330] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 156.609142][ T330] ? trace_kmalloc (./include/trace/events/kmem.h:54 (discriminator 21))
[ 156.609146][ T330] ? __kvmalloc_node_noprof (mm/slub.c:5055)
[ 156.609152][ T330] snmp6_seq_show (net/ipv6/proc.c:224)
[ 156.609155][ T330] seq_read_iter (fs/seq_file.c:231)
[ 156.609165][ T330] seq_read (fs/seq_file.c:163)
[ 156.609169][ T330] ? seq_read_iter (fs/seq_file.c:152)
[ 156.609173][ T330] ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 156.609180][ T330] ? __mutex_trylock_common (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4296 ./include/linux/atomic/atomic-long.h:1482 ./include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:113)
[ 156.609184][ T330] ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[ 156.609189][ T330] proc_reg_read (fs/proc/inode.c:308 fs/proc/inode.c:320)
[ 156.609196][ T330] vfs_read (fs/read_write.c:570)
[ 156.609201][ T330] ? fdget_pos (fs/file.c:1235)
[ 156.609206][ T330] ? ww_mutex_lock (kernel/locking/mutex.c:759)
[ 156.609212][ T330] ? kernel_read (fs/read_write.c:553)
[ 156.609215][ T330] ? __lock_release (kernel/locking/lockdep.c:5536)
[ 156.609220][ T330] ? __fget_files (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:871 fs/file.c:1072)
[ 156.609223][ T330] ? __fget_files (fs/file.c:1075)
[ 156.609230][ T330] ksys_read (fs/read_write.c:715)
[ 156.609234][ T330] ? vfs_write (fs/read_write.c:705)
[ 156.609240][ T330] do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 156.609244][ T330] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[ 156.609248][ T330] RIP: 0033:0x7f5190d4a2cc
[ 156.609252][ T330] Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8b f8 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 7f 8b f8 ff 48
All code
========
0: ec in (%dx),%al
1: 28 48 89 sub %cl,-0x77(%rax)
4: 54 push %rsp
5: 24 18 and $0x18,%al
7: 48 89 74 24 10 mov %rsi,0x10(%rsp)
c: 89 7c 24 08 mov %edi,0x8(%rsp)
10: e8 29 8b f8 ff call 0xfffffffffff88b3e
15: 48 8b 54 24 18 mov 0x18(%rsp),%rdx
1a: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
1f: 41 89 c0 mov %eax,%r8d
22: 8b 7c 24 08 mov 0x8(%rsp),%edi
26: 31 c0 xor %eax,%eax
28: 0f 05 syscall
2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction
30: 77 34 ja 0x66
32: 44 89 c7 mov %r8d,%edi
35: 48 89 44 24 08 mov %rax,0x8(%rsp)
3a: e8 7f 8b f8 ff call 0xfffffffffff88bbe
3f: 48 rex.W
Code starting with the faulting instruction
===========================================
0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax
6: 77 34 ja 0x3c
8: 44 89 c7 mov %r8d,%edi
b: 48 89 44 24 08 mov %rax,0x8(%rsp)
10: e8 7f 8b f8 ff call 0xfffffffffff88b94
15: 48 rex.W
[ 156.609255][ T330] RSP: 002b:00007f518bffe090 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[ 156.609259][ T330] RAX: ffffffffffffffda RBX: 00007f5184000f30 RCX: 00007f5190d4a2cc
[ 156.609261][ T330] RDX: 0000000000000400 RSI: 00007f5184001190 RDI: 000000000000000b
[ 156.609263][ T330] RBP: 00007f5190e425c0 R08: 0000000000000000 R09: 0000000000000000
[ 156.609265][ T330] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
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