BUG: MAX_LOCKDEP_CHAINS too low! turning off the locking correctness validator. CPU: 0 PID: 22427 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 add_chain_cache kernel/locking/lockdep.c:2259 [inline] lookup_chain_cache_add kernel/locking/lockdep.c:2371 [inline] validate_chain kernel/locking/lockdep.c:2391 [inline] __lock_acquire.cold+0x420/0x57e kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get+0xd0/0x2f0 kernel/time/timekeeping.c:756 hrtimer_expires_remaining include/linux/hrtimer.h:285 [inline] __hrtimer_get_remaining+0xd7/0x1d0 kernel/time/hrtimer.c:1260 hrtimer_get_remaining include/linux/hrtimer.h:425 [inline] perf_swevent_cancel_hrtimer kernel/events/core.c:9297 [inline] perf_swevent_cancel_hrtimer kernel/events/core.c:9292 [inline] cpu_clock_event_stop kernel/events/core.c:9351 [inline] cpu_clock_event_del+0xa3/0x100 kernel/events/core.c:9366 event_sched_out+0x34d/0xca0 kernel/events/core.c:2014 group_sched_out.part.0+0x110/0x3f0 kernel/events/core.c:2047 group_sched_out kernel/events/core.c:2042 [inline] ctx_sched_out+0x8eb/0xbf0 kernel/events/core.c:2964 task_ctx_sched_out+0x5b/0x80 kernel/events/core.c:2421 perf_event_context_sched_out kernel/events/core.c:3146 [inline] __perf_event_task_sched_out+0xa5b/0x1470 kernel/events/core.c:3237 perf_event_task_sched_out include/linux/perf_event.h:1132 [inline] prepare_task_switch kernel/sched/core.c:2612 [inline] context_switch kernel/sched/core.c:2793 [inline] __schedule+0xd8a/0x2040 kernel/sched/core.c:3517 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3744 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:lock_acquire+0x1ec/0x3c0 kernel/locking/lockdep.c:3911 Code: 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 b7 01 00 00 48 83 3d 09 2e a6 08 00 0f 84 2a 01 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b RSP: 0018:ffff8880165c7aa8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3051 RBX: ffff8880441c8040 RCX: 0000000000005b58 RDX: dffffc0000000000 RSI: 000000002c067800 RDI: 0000000000000286 RBP: ffffffff89ff4d00 R08: ffffffff8cd45000 R09: 0000000000000001 R10: ffff8880441c88f0 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 __fs_reclaim_acquire mm/page_alloc.c:3759 [inline] fs_reclaim_acquire+0x105/0x130 mm/page_alloc.c:3770 slab_pre_alloc_hook mm/slab.h:419 [inline] slab_alloc mm/slab.c:3383 [inline] __do_kmalloc mm/slab.c:3725 [inline] __kmalloc_track_caller+0x4a/0x3c0 mm/slab.c:3742 kstrdup+0x36/0x70 mm/util.c:56 kstrdup_const+0x53/0x80 mm/util.c:77 alloc_vfsmnt+0xb5/0x780 fs/namespace.c:188 clone_mnt+0x6c/0x11b0 fs/namespace.c:1001 copy_tree+0x3af/0xaf0 fs/namespace.c:1766 copy_mnt_ns+0x1c2/0xad0 fs/namespace.c:2920 create_new_namespaces+0xd6/0x7b0 kernel/nsproxy.c:75 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2542 __do_sys_unshare kernel/fork.c:2610 [inline] __se_sys_unshare kernel/fork.c:2608 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2608 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f505630d0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f505487f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f505642cf80 RCX: 00007f505630d0f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000020000 RBP: 00007f5056368ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcde62cc9f R14: 00007f505487f300 R15: 0000000000022000 syz-executor.3 uses old SIOCAX25GETINFO base_sock_release(0000000000eab46c) sk= (null) audit: type=1804 audit(1678177251.646:17025): pid=22456 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4008432416/syzkaller.KVWIPv/119/bus" dev="sda1" ino=13910 res=1 audit: type=1804 audit(1678177251.756:17026): pid=22507 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir4008432416/syzkaller.KVWIPv/119/bus" dev="sda1" ino=13910 res=1 base_sock_release(000000000c6b68f2) sk=00000000c9525ef3 IPVS: ftp: loaded support on port[0] = 21 base_sock_release(00000000bd275372) sk= (null) audit: type=1804 audit(1678177252.456:17027): pid=22564 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4008432416/syzkaller.KVWIPv/120/bus" dev="sda1" ino=14132 res=1 audit: type=1804 audit(1678177252.486:17028): pid=22564 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir4008432416/syzkaller.KVWIPv/120/bus" dev="sda1" ino=14132 res=1 IPVS: ftp: loaded support on port[0] = 21 base_sock_release(00000000d7d35239) sk=00000000b773974e IPVS: ftp: loaded support on port[0] = 21 base_sock_release(0000000096244a40) sk= (null) audit: type=1804 audit(1678177253.396:17029): pid=22644 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4008432416/syzkaller.KVWIPv/121/bus" dev="sda1" ino=14931 res=1 audit: type=1804 audit(1678177253.416:17030): pid=22656 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.3" name="/root/syzkaller-testdir4008432416/syzkaller.KVWIPv/121/bus" dev="sda1" ino=14931 res=1 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. base_sock_release(00000000d73c265c) sk=00000000cbecb902 audit: type=1804 audit(1678177254.156:17031): pid=22648 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="bus" dev="sda1" ino=14609 res=1 audit: type=1800 audit(1678177254.156:17032): pid=22648 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=14609 res=0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'. Enabled bearer , priority 0 audit: type=1804 audit(1678177255.026:17033): pid=22748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="bus" dev="sda1" ino=15065 res=1 audit: type=1800 audit(1678177255.026:17034): pid=22748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15065 res=0 audit: type=1804 audit(1678177255.026:17035): pid=22748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="bus" dev="sda1" ino=15065 res=1 Enabling of bearer rejected, already enabled audit: type=1800 audit(1678177255.026:17036): pid=22748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15065 res=0 audit: type=1804 audit(1678177255.096:17037): pid=22743 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir4008432416/syzkaller.KVWIPv/122/bus" dev="sda1" ino=14801 res=1 Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 audit: type=1804 audit(1678177256.057:17038): pid=22811 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="bus" dev="sda1" ino=15075 res=1 32-bit node address hash set to 1414ac Started in network mode Own node identity aaaaaaaaaa32, cluster identity 4711 Enabled bearer , priority 0 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Enabling of bearer rejected, already enabled TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO 32-bit node address hash set to aaaa9800 sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 TCP: request_sock_TCP: Possible SYN flooding on port 20002. Sending cookies. Check SNMP counters. Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 kauditd_printk_skb: 4 callbacks suppressed audit: type=1800 audit(1678177258.737:17043): pid=23019 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=15081 res=0 Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Enabling of bearer rejected, already enabled audit: type=1800 audit(1678177259.567:17044): pid=23073 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=15026 res=0 overlayfs: unrecognized mount option "eðperworkdir=.Ö{$›d°)Þ" or missing value program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Enabling of bearer rejected, already enabled overlayfs: unrecognized mount option "eðperworkdir=.Ö{$›d°)Þ" or missing value program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 overlayfs: unrecognized mount option "eðperworkdir=.Ö{$›d°)Þ" or missing value Enabling of bearer rejected, already enabled audit: type=1800 audit(1678177260.618:17045): pid=23150 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=15042 res=0 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Started in network mode Own node identity aaaaaaaaaa32, cluster identity 4711 Enabled bearer , priority 0 ipt_CLUSTERIP: Please specify destination IP program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 tmpfs: No value for mount option 'dont_measure' Enabling of bearer rejected, already enabled ipt_CLUSTERIP: Please specify destination IP tmpfs: No value for mount option 'dont_measure' tmpfs: No value for mount option 'dont_measure' program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO ipt_CLUSTERIP: Please specify destination IP sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 audit: type=1804 audit(1678177261.768:17046): pid=23237 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/282/bus" dev="sda1" ino=15026 res=1 tmpfs: No value for mount option 'dont_measure' tmpfs: No value for mount option 'dont_measure' IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1678177261.768:17047): pid=23237 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=15026 res=0 Enabling of bearer rejected, already enabled audit: type=1804 audit(1678177261.868:17048): pid=23243 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/282/bus" dev="sda1" ino=15026 res=1 32-bit node address hash set to aaaa9800 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO audit: type=1804 audit(1678177263.438:17049): pid=23351 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/283/bus" dev="sda1" ino=13903 res=1 sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1678177263.438:17050): pid=23351 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=13903 res=0 audit: type=1804 audit(1678177263.518:17051): pid=23353 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/283/bus" dev="sda1" ino=13903 res=1 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 audit: type=1804 audit(1678177264.758:17052): pid=23350 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="bus" dev="sda1" ino=13902 res=1 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO overlayfs: conflicting lowerdir path sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 audit: type=1804 audit(1678177265.429:17053): pid=23455 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 overlayfs: conflicting lowerdir path IPVS: ftp: loaded support on port[0] = 21 audit: type=1800 audit(1678177265.429:17054): pid=23455 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14244 res=0 overlayfs: conflicting lowerdir path audit: type=1804 audit(1678177265.479:17055): pid=23457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 audit: type=1804 audit(1678177265.479:17056): pid=23457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 audit: type=1804 audit(1678177265.479:17057): pid=23457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO audit: type=1804 audit(1678177265.479:17058): pid=23457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 audit: type=1804 audit(1678177265.479:17059): pid=23457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 audit: type=1804 audit(1678177265.479:17060): pid=23457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 IPVS: ftp: loaded support on port[0] = 21 ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 audit: type=1804 audit(1678177265.479:17061): pid=23457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=ToMToU comm="syz-executor.2" name="/root/syzkaller-testdir746133706/syzkaller.NV6FHf/284/bus" dev="sda1" ino=14244 res=1 IPVS: ftp: loaded support on port[0] = 21 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 IPVS: ftp: loaded support on port[0] = 21 device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO device lo left promiscuous mode sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 device lo entered promiscuous mode IPv6: ADDRCONF(NETDEV_CHANGE): lo: link becomes ready ---------------- Code disassembly (best guess): 0: 08 00 or %al,(%rax) 2: 00 00 add %al,(%rax) 4: 00 00 add %al,(%rax) 6: 00 48 c1 add %cl,-0x3f(%rax) 9: e8 03 80 3c 10 callq 0x103c8011 e: 00 0f add %cl,(%rdi) 10: 85 b7 01 00 00 48 test %esi,0x48000001(%rdi) 16: 83 3d 09 2e a6 08 00 cmpl $0x0,0x8a62e09(%rip) # 0x8a62e26 1d: 0f 84 2a 01 00 00 je 0x14d 23: 48 8b 7c 24 08 mov 0x8(%rsp),%rdi 28: 57 push %rdi 29: 9d popfq * 2a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2f: 48 83 c4 18 add $0x18,%rsp 33: 5b pop %rbx 34: 5d pop %rbp 35: 41 5c pop %r12 37: 41 5d pop %r13 39: 41 5e pop %r14 3b: 41 5f pop %r15 3d: c3 retq 3e: 65 gs 3f: 8b .byte 0x8b