ci2 starts bisection 2026-01-06 13:05:32.83129995 +0000 UTC m=+3540945.008423117 bisecting fixing commit since f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe building syzkaller on d6526ea3e6ad9081c902859bbb80f9f840377cb4 ensuring issue is reproducible on original commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 6ce1bb54b5ff30bca3bf7ce86474bb8de06d3d67f32eddc76b51031c35e580e5 run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc run #3: basic kernel testing failed: SYZFAIL: failed to recv rpc run #4: basic kernel testing failed: SYZFAIL: failed to recv rpc run #5: basic kernel testing failed: SYZFAIL: failed to recv rpc run #6: crashed: inconsistent lock state in trie_delete_elem run #7: crashed: inconsistent lock state in trie_delete_elem run #8: crashed: inconsistent lock state in trie_delete_elem run #9: crashed: inconsistent lock state in trie_delete_elem run #10: crashed: inconsistent lock state in trie_delete_elem run #11: crashed: inconsistent lock state in trie_delete_elem run #12: crashed: inconsistent lock state in trie_delete_elem run #13: crashed: inconsistent lock state in trie_delete_elem run #14: crashed: inconsistent lock state in trie_delete_elem run #15: crashed: inconsistent lock state in trie_delete_elem run #16: crashed: inconsistent lock state in trie_delete_elem run #17: crashed: inconsistent lock state in trie_delete_elem run #18: crashed: inconsistent lock state in trie_delete_elem run #19: crashed: inconsistent lock state in trie_delete_elem representative crash: inconsistent lock state in trie_delete_elem, types: [LOCKDEP] check whether we can drop unnecessary instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: c80500b0fb03e38124caac97b3791572c864462134d09a814ac8507570fc78c3 run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc run #3: basic kernel testing failed: SYZFAIL: failed to recv rpc run #4: crashed: inconsistent lock state in trie_delete_elem run #5: crashed: inconsistent lock state in trie_delete_elem run #6: crashed: inconsistent lock state in trie_delete_elem run #7: crashed: inconsistent lock state in trie_delete_elem run #8: crashed: inconsistent lock state in trie_delete_elem run #9: crashed: inconsistent lock state in trie_delete_elem representative crash: inconsistent lock state in trie_delete_elem, types: [LOCKDEP] the bug reproduces without the instrumentation disabling configs for [atomic_sleep hang memleak ubsan bug_or_warning kasan], they are not needed kconfig minimization: base=3829 full=7619 leaves diff=2129 split chunks (needed=false): <2129> split chunk #0 of len 2129 into 5 parts testing without sub-chunk 1/5 disabling configs for [kasan atomic_sleep hang memleak ubsan bug_or_warning], they are not needed testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 70e7c82d725cde523bd2f1184ace474fc20243b1e820e97b8e634fdc39507943 run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: crashed: inconsistent lock state in trie_delete_elem run #2: crashed: inconsistent lock state in trie_delete_elem run #3: crashed: inconsistent lock state in trie_delete_elem run #4: crashed: inconsistent lock state in trie_delete_elem run #5: crashed: inconsistent lock state in trie_delete_elem run #6: crashed: inconsistent lock state in trie_delete_elem run #7: crashed: inconsistent lock state in trie_delete_elem run #8: crashed: inconsistent lock state in trie_delete_elem run #9: crashed: inconsistent lock state in trie_delete_elem representative crash: inconsistent lock state in trie_delete_elem, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 2/5 disabling configs for [memleak ubsan bug_or_warning kasan atomic_sleep hang], they are not needed testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: eac45c5f5e5d277ffa04612d04f98fd3c31725dc55c55a1e5c649d795ef873cf all runs: crashed: inconsistent lock state in trie_delete_elem representative crash: inconsistent lock state in trie_delete_elem, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 3/5 disabling configs for [hang memleak ubsan bug_or_warning kasan atomic_sleep], they are not needed testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 8b125b330bf9bd3ba161892ba74a8aa27fdf991560cf36e1fc98a23cd63416fc run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc run #2: crashed: inconsistent lock state in trie_delete_elem run #3: crashed: inconsistent lock state in trie_delete_elem run #4: crashed: inconsistent lock state in trie_delete_elem run #5: crashed: inconsistent lock state in trie_delete_elem run #6: crashed: inconsistent lock state in trie_delete_elem run #7: crashed: inconsistent lock state in trie_delete_elem run #8: crashed: inconsistent lock state in trie_delete_elem run #9: crashed: inconsistent lock state in trie_delete_elem representative crash: inconsistent lock state in trie_delete_elem, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 4/5 disabling configs for [ubsan bug_or_warning kasan atomic_sleep hang memleak], they are not needed testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 0c120c502ebbfa0db47deebef095f6caa0999dd581074db0c77c298a1039c370 run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: crashed: inconsistent lock state in trie_delete_elem run #2: crashed: inconsistent lock state in trie_delete_elem run #3: crashed: inconsistent lock state in trie_delete_elem run #4: crashed: inconsistent lock state in trie_delete_elem run #5: crashed: inconsistent lock state in trie_delete_elem run #6: crashed: inconsistent lock state in trie_delete_elem run #7: crashed: inconsistent lock state in trie_delete_elem run #8: crashed: inconsistent lock state in trie_delete_elem run #9: crashed: inconsistent lock state in trie_delete_elem representative crash: inconsistent lock state in trie_delete_elem, types: [LOCKDEP] the chunk can be dropped testing without sub-chunk 5/5 disabling configs for [ubsan bug_or_warning kasan atomic_sleep hang memleak], they are not needed testing commit f6e38ae624cf7eb96fb444a8ca2d07caa8d9c8fe gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: fb9db999967ba4710c62cae52ee406899f4ec640f91a2e3f49e73e440685d246 run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: basic kernel testing failed: SYZFAIL: failed to recv rpc run #2: basic kernel testing failed: SYZFAIL: failed to recv rpc run #3: basic kernel testing failed: SYZFAIL: failed to recv rpc run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: OK false negative chance: 0.000 minimized to 425 configs; suspects: 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USERFAULTFD USERIO USER_RETURN_NOTIFIER U_SERIAL_CONSOLE V4L2_MEM2MEM_DEV V4L_TEST_DRIVERS VALIDATE_FS_PARSER VDPA VDPA_SIM VDPA_SIM_BLOCK VDPA_SIM_NET VDPA_USER VETH VFIO VFIO_IOMMU_TYPE1 VFIO_PCI VFIO_PCI_CORE VFIO_PCI_INTX VFIO_PCI_MMAP VFIO_VIRQFD VGASTATE VHOST VHOST_CROSS_ENDIAN_LEGACY VHOST_IOTLB VHOST_NET VHOST_RING VHOST_VDPA VHOST_VSOCK VIDEOBUF2_CORE VIDEOBUF2_DMA_CONTIG VIDEOBUF2_DMA_SG VIDEOBUF2_MEMOPS VIDEOBUF2_V4L2 VIDEOBUF2_VMALLOC VIDEOMODE_HELPERS VIDEO_AU0828 VIDEO_AU0828_RC VIDEO_AU0828_V4L2 VIDEO_CS53L32A VIDEO_CX231XX VIDEO_CX231XX_ALSA VIDEO_CX231XX_DVB VIDEO_CX231XX_RC VIDEO_CX2341X VIDEO_CX25840 VIDEO_DEV VIDEO_EM28XX VIDEO_EM28XX_ALSA VIDEO_EM28XX_DVB VIDEO_EM28XX_RC VIDEO_EM28XX_V4L2 VIDEO_GO7007 VIDEO_GO7007_LOADER VIDEO_GO7007_USB VIDEO_GO7007_USB_S2250_BOARD VIDEO_HDPVR VIDEO_MSP3400 VIDEO_PVRUSB2 VIDEO_PVRUSB2_DVB VIDEO_PVRUSB2_SYSFS VIDEO_SAA711X VIDEO_STK1160 VIDEO_STK1160_COMMON VIDEO_TUNER VIDEO_TVEEPROM VIDEO_USBTV VIDEO_V4L2_I2C VIDEO_V4L2_SUBDEV_API VIDEO_V4L2_TPG VIDEO_VICODEC VIDEO_VIM2M VIDEO_VIMC VIDEO_VIVID VIDEO_VIVID_CEC VIDEO_WM8775 VIPERBOARD_ADC VIRTIO_BALLOON VIRTIO_DMA_SHARED_BUFFER VIRTIO_MEM VIRTIO_MMIO VIRTIO_MMIO_CMDLINE_DEVICES VIRTIO_PMEM VIRTIO_VDPA VIRTIO_VSOCKETS VIRTIO_VSOCKETS_COMMON VIRT_WIFI VLAN_8021Q VLAN_8021Q_GVRP VLAN_8021Q_MVRP VMAP_PFN VMWARE_VMCI VMXNET3 VP_VDPA VSOCKETS VSOCKETS_DIAG VSOCKETS_LOOPBACK VSOCKMON VT_HW_CONSOLE_BINDING VXFS_FS WANT_DEV_COREDUMP WEXT_CORE WEXT_PRIV WEXT_PROC WIREGUARD WIRELESS WIRELESS_EXT WLAN WLAN_VENDOR_ADMTEK WLAN_VENDOR_SILABS X86_SGX X86_SGX_KVM X86_X2APIC XARRAY_MULTI XDP_SOCKETS XDP_SOCKETS_DIAG XFRM_ESPINTCP XFRM_INTERFACE XFRM_IPCOMP XFRM_MIGRATE XFRM_OFFLOAD XFRM_STATISTICS XFRM_SUB_POLICY XFRM_USER_COMPAT XFS_FS XFS_POSIX_ACL XFS_QUOTA XFS_RT XILLYBUS_CLASS XILLYUSB XOR_BLOCKS YENTA YENTA_ENE_TUNE YENTA_O2 YENTA_RICOH YENTA_TI YENTA_TOSHIBA ZBUD ZEROPLUS_FF ZLIB_DEFLATE ZONEFS_FS ZPOOL ZRAM ZRAM_DEF_COMP_LZORLE ZSMALLOC ZSTD_COMPRESS ZSWAP ZSWAP_COMPRESSOR_DEFAULT_LZO ZSWAP_DEFAULT_ON ZSWAP_ZPOOL_DEFAULT_ZBUD] disabling configs for [ubsan bug_or_warning kasan atomic_sleep hang memleak], they are not needed testing current HEAD 50cbba13faa294918f0e1a9cb2b0aba19f4e6fba testing commit 50cbba13faa294918f0e1a9cb2b0aba19f4e6fba gcc compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 kernel signature: 3262352fa8bd741dd1562223ef3ad66d8cb5d3d9e2abe1f7036ff0e74f5a4067 run #0: basic kernel testing failed: SYZFAIL: failed to recv rpc run #1: crashed: inconsistent lock state in trie_delete_elem run #2: crashed: inconsistent lock state in trie_delete_elem run #3: crashed: inconsistent lock state in trie_delete_elem run #4: crashed: inconsistent lock state in trie_delete_elem run #5: crashed: inconsistent lock state in trie_delete_elem run #6: crashed: inconsistent lock state in trie_delete_elem run #7: crashed: inconsistent lock state in trie_delete_elem run #8: crashed: inconsistent lock state in trie_delete_elem run #9: crashed: inconsistent lock state in trie_delete_elem representative crash: inconsistent lock state in trie_delete_elem, types: [LOCKDEP] crash still not fixed/happens on the oldest tested release revisions tested: 8, total time: 2h20m36.775316768s (build: 43m5.988088006s, test: 57m7.299615909s) crash still not fixed or there were kernel test errors commit msg: Linux 6.1.159 crash: inconsistent lock state in trie_delete_elem ================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.2.17/3153 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888117046238 (&trie->lock){....}-{2:2}, at: trie_delete_elem+0x39/0x1d0 kernel/bpf/lpm_trie.c:467 {INITIAL USE} state was registered at: lock_acquire+0xe9/0x270 kernel/locking/lockdep.c:5662 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x90 kernel/locking/spinlock.c:162 trie_delete_elem+0x39/0x1d0 kernel/bpf/lpm_trie.c:467 ____bpf_map_delete_elem kernel/bpf/helpers.c:73 [inline] bpf_map_delete_elem+0x38/0x40 kernel/bpf/helpers.c:69 ___bpf_prog_run+0x8ef/0x1cd0 kernel/bpf/core.c:1846 __bpf_prog_run32+0xb7/0xe0 kernel/bpf/core.c:2072 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:603 [inline] bpf_prog_run include/linux/filter.h:610 [inline] bpf_overflow_handler+0x23c/0x360 kernel/events/core.c:10286 __perf_event_overflow+0x103/0x170 kernel/events/core.c:9496 perf_swevent_overflow kernel/events/core.c:9572 [inline] perf_swevent_event+0x106/0x120 kernel/events/core.c:9610 perf_bp_event+0x9c/0xc0 kernel/events/core.c:10478 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x94/0x1c0 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain kernel/notifier.c:87 [inline] atomic_notifier_call_chain+0xbd/0x130 kernel/notifier.c:225 notify_die+0x81/0xa0 kernel/notifier.c:593 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018 exc_debug_user arch/x86/kernel/traps.c:1144 [inline] noist_exc_debug+0x63/0x100 arch/x86/kernel/traps.c:1181 asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:648 irq event stamp: 1414 hardirqs last enabled at (1413): [] native_save_fl arch/x86/include/asm/irqflags.h:22 [inline] hardirqs last enabled at (1413): [] arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] hardirqs last enabled at (1413): [] arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline] hardirqs last enabled at (1413): [] seqcount_lockdep_reader_access+0xa9/0x100 include/linux/seqlock.h:104 hardirqs last disabled at (1414): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (1414): [] exc_debug+0x6e/0x120 arch/x86/kernel/traps.c:1175 softirqs last enabled at (1162): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (1162): [] bpf_prog_alloc_id+0x54/0xe0 kernel/bpf/syscall.c:2025 softirqs last disabled at (1160): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (1160): [] bpf_prog_alloc_id+0x1c/0xe0 kernel/bpf/syscall.c:2021 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&trie->lock); lock(&trie->lock); *** DEADLOCK *** no locks held by syz.2.17/3153. stack backtrace: CPU: 1 PID: 3153 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: <#DB> dump_stack_lvl+0x7f/0xdb lib/dump_stack.c:106 lock_acquire+0x1d5/0x270 kernel/locking/lockdep.c:5653 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x90 kernel/locking/spinlock.c:162 trie_delete_elem+0x39/0x1d0 kernel/bpf/lpm_trie.c:467 ____bpf_map_delete_elem kernel/bpf/helpers.c:73 [inline] bpf_map_delete_elem+0x38/0x40 kernel/bpf/helpers.c:69 ___bpf_prog_run+0x8ef/0x1cd0 kernel/bpf/core.c:1846 __bpf_prog_run32+0xb7/0xe0 kernel/bpf/core.c:2072 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:603 [inline] bpf_prog_run include/linux/filter.h:610 [inline] bpf_overflow_handler+0x23c/0x360 kernel/events/core.c:10286 __perf_event_overflow+0x103/0x170 kernel/events/core.c:9496 perf_swevent_overflow kernel/events/core.c:9572 [inline] perf_swevent_event+0x106/0x120 kernel/events/core.c:9610 perf_bp_event+0x9c/0xc0 kernel/events/core.c:10478 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x94/0x1c0 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain kernel/notifier.c:87 [inline] atomic_notifier_call_chain+0xbd/0x130 kernel/notifier.c:225 notify_die+0x81/0xa0 kernel/notifier.c:593 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018 exc_debug_kernel arch/x86/kernel/traps.c:1075 [inline] exc_debug+0xcc/0x120 arch/x86/kernel/traps.c:1175 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:648 RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166 Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900013d3ce8 EFLAGS: 00050206 RAX: 00007fffffffe1c0 RBX: 0000000000000e40 RCX: 0000000000000e3f RDX: 0000000000000e40 RSI: ffff888104361041 RDI: 0000200000000301 RBP: 0000000000000e40 R08: 0000000000000000 R09: ffff88811803d340 R10: ffffc900013d3bc8 R11: 0000000000000028 R12: 0000000000000e40 R13: ffff888104361040 R14: 0000200000000300 R15: ffff888104361040 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline] _copy_to_user+0x49/0x60 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:169 [inline] bpf_test_finish+0xa9/0x280 net/bpf/test_run.c:439 bpf_prog_test_run_skb+0x4ee/0x530 net/bpf/test_run.c:1203 bpf_prog_test_run+0xda/0x100 kernel/bpf/syscall.c:3692 __sys_bpf+0x344/0x3f0 kernel/bpf/syscall.c:5045 __do_sys_bpf kernel/bpf/syscall.c:5131 [inline] __se_sys_bpf kernel/bpf/syscall.c:5129 [inline] __x64_sys_bpf+0x13/0x20 kernel/bpf/syscall.c:5129 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f3c3630f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f3c3617f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f3c36565fa0 RCX: 00007f3c3630f749 RDX: 000000000000004c RSI: 0000200000000240 RDI: 000000000000000a RBP: 00007f3c36393f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f3c36566038 R14: 00007f3c36565fa0 R15: 00007ffc18bd30e8 ---------------- Code disassembly (best guess): 0: ff c9 dec %ecx 2: 75 f2 jne 0xfffffff6 4: 89 d1 mov %edx,%ecx 6: c1 e9 03 shr $0x3,%ecx 9: 83 e2 07 and $0x7,%edx c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) f: 89 d1 mov %edx,%ecx 11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 13: 31 c0 xor %eax,%eax 15: 0f 01 ca clac 18: c3 ret 19: 8d 0c ca lea (%rdx,%rcx,8),%ecx 1c: 89 ca mov %ecx,%edx 1e: eb 20 jmp 0x40 20: 0f 01 cb stac 23: 83 fa 40 cmp $0x40,%edx 26: 72 38 jb 0x60 28: 89 d1 mov %edx,%ecx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: 0f 01 ca clac 31: c3 ret 32: 89 ca mov %ecx,%edx 34: eb 0a jmp 0x40 36: 90 nop 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop