------------[ cut here ]------------ WARNING: CPU: 0 PID: 13863 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226 Modules linked in: CPU: 0 PID: 13863 Comm: syz.8.2209 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226 Code: 24 45 31 f6 31 ff 89 de e8 4d 97 d8 ff 85 db 48 c7 c0 f2 ff ff ff 49 0f 44 c6 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 d0 93 d8 ff <0f> 0b e9 1c ff ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c ea fe RSP: 0018:fffffe0000016960 EFLAGS: 00010006 RAX: ffffffff81a068e0 RBX: 0000000000000000 RCX: ffff888021c85940 RDX: 0000000000110000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: fffffe00000168ff R09: fffffe00000168d8 R10: dffffc0000000000 R11: fffffbc000002d20 R12: ffff888021c870c8 R13: ffffc900010f8030 R14: fffffe00000169c8 R15: 000000000028e000 FS: 00007fc629b186c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c321c37 CR3: 000000008224f000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: <#DB> bpf_probe_read_user_common kernel/trace/bpf_trace.c:157 [inline] ____bpf_probe_read_user kernel/trace/bpf_trace.c:166 [inline] bpf_probe_read_user+0x26/0x70 kernel/trace/bpf_trace.c:163 bpf_prog_26fc836ad493b19c+0x3d/0xcfc bpf_dispatcher_nop_func include/linux/bpf.h:889 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_overflow_handler+0x1c2/0x4a0 kernel/events/core.c:10297 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9515 perf_bp_event+0x276/0x320 kernel/events/core.c:10484 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x14d/0x470 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain kernel/notifier.c:83 [inline] atomic_notifier_call_chain+0x15d/0x280 kernel/notifier.c:198 notify_die+0x141/0x1a0 kernel/notifier.c:529 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:872 exc_debug_kernel arch/x86/kernel/traps.c:929 [inline] exc_debug+0xcf/0x130 arch/x86/kernel/traps.c:1029 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:642 RIP: 0010:has_zero arch/x86/include/asm/word-at-a-time.h:49 [inline] RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:54 [inline] RIP: 0010:strncpy_from_user+0x164/0x350 lib/strncpy_from_user.c:139 Code: 89 e6 e8 ef 04 71 fd 49 83 fc 07 0f 86 9a 00 00 00 4c 89 74 24 08 48 c7 44 24 10 f8 ff ff ff 45 31 ed 4c 89 3c 24 4f 8b 3c 2f <48> b8 ff fe fe fe fe fe fe fe 49 8d 2c 07 4d 89 fe 49 f7 d6 48 b8 RSP: 0018:ffffc9000313fb90 EFLAGS: 00040246 RAX: ffffffff8407fba1 RBX: ffffc9000313fcb0 RCX: ffff888021c85940 RDX: 0000000000000002 RSI: 000000000000007f RDI: 0000000000000007 RBP: 000020000000037f R08: ffff888021c85940 R09: 0000000000000003 R10: 0000000000000002 R11: 0000000000000002 R12: 000000000000007f R13: 0000000000000000 R14: 000000000000007f R15: 00000000004c5047 strncpy_from_bpfptr include/linux/bpfptr.h:84 [inline] bpf_prog_load+0x1fd/0x14e0 kernel/bpf/syscall.c:2239 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc62b8c00d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc629b18028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc62bb47fa0 RCX: 00007fc62b8c00d9 RDX: 0000000000000021 RSI: 0000200000000980 RDI: 0000000000000005 RBP: 00007fc62b957024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc62bb48038 R14: 00007fc62bb47fa0 R15: 00007ffd3cf29eb8 ---------------- Code disassembly (best guess): 0: 89 e6 mov %esp,%esi 2: e8 ef 04 71 fd call 0xfd7104f6 7: 49 83 fc 07 cmp $0x7,%r12 b: 0f 86 9a 00 00 00 jbe 0xab 11: 4c 89 74 24 08 mov %r14,0x8(%rsp) 16: 48 c7 44 24 10 f8 ff movq $0xfffffffffffffff8,0x10(%rsp) 1d: ff ff 1f: 45 31 ed xor %r13d,%r13d 22: 4c 89 3c 24 mov %r15,(%rsp) 26: 4f 8b 3c 2f mov (%r15,%r13,1),%r15 * 2a: 48 b8 ff fe fe fe fe movabs $0xfefefefefefefeff,%rax <-- trapping instruction 31: fe fe fe 34: 49 8d 2c 07 lea (%r15,%rax,1),%rbp 38: 4d 89 fe mov %r15,%r14 3b: 49 f7 d6 not %r14 3e: 48 rex.W 3f: b8 .byte 0xb8