------------[ cut here ]------------ WARNING: CPU: 1 PID: 5364 at mm/maccess.c:226 copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226 Modules linked in: CPU: 1 PID: 5364 Comm: syz.5.10905 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:copy_from_user_nofault+0x160/0x1c0 mm/maccess.c:226 Code: 24 45 31 f6 31 ff 89 de e8 5d 94 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 e0 90 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:fffffe000005d8f8 EFLAGS: 00010006 RAX: ffffffff81a09160 RBX: 0000000000000008 RCX: ffff88802a6fd940 RDX: 0000000000110000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88802a6fd947 R09: 1ffff110054dfb28 R10: dffffc0000000000 R11: ffffed10054dfb29 R12: ffff88802a6ff0c8 R13: 00007ffffffff000 R14: fffffe000005d968 R15: 0000000020000000 FS: 00007f256d3c46c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7f5d8fc6b8 CR3: 000000005bd4d000 CR4: 00000000003506e0 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_compat kernel/trace/bpf_trace.c:281 [inline] bpf_probe_read_compat+0xdd/0x170 kernel/trace/bpf_trace.c:277 bpf_prog_63d51858d7cca270+0x3d/0x288 bpf_dispatcher_nop_func include/linux/bpf.h:888 [inline] __bpf_prog_run include/linux/filter.h:621 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_overflow_handler+0x3fd/0x4a0 kernel/events/core.c:10297 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_swevent_overflow kernel/events/core.c:9591 [inline] perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9629 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+0x152/0x470 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:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:92 Code: 38 4c 89 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 <4c> 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a RSP: 0018:ffffc9000364fa60 EFLAGS: 00040202 RAX: ffffffff83e3cf01 RBX: 0000000000000008 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000200000000300 RDI: ffffc9000364fc40 RBP: 0000000000000000 R08: 0000000000000002 R09: 1ffff920006c9f88 R10: dffffc0000000000 R11: fffff520006c9f89 R12: 00007ffffffff000 R13: 0000200000000308 R14: ffffc9000364fc40 R15: 0000200000000300 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline] _copy_from_user+0xfa/0x170 lib/usercopy.c:23 copy_from_user include/linux/uaccess.h:192 [inline] move_addr_to_kernel net/socket.c:250 [inline] __copy_msghdr_from_user+0x48a/0x630 net/socket.c:2350 copy_msghdr_from_user net/socket.c:2378 [inline] sendmsg_copy_msghdr net/socket.c:2476 [inline] ___sys_sendmsg+0x19a/0x2e0 net/socket.c:2495 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535 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: 0033:0x7f256f16a799 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:00007f256d3c4028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f256f3e3fa0 RCX: 00007f256f16a799 RDX: 0900000000000000 RSI: 0000200000000500 RDI: 0000000000000005 RBP: 00007f256f200bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f256f3e4038 R14: 00007f256f3e3fa0 R15: 00007ffcbcf84c98 ---------------- Code disassembly (best guess): 0: 38 4c 89 47 cmp %cl,0x47(%rcx,%rcx,4) 4: 20 4c 89 4f and %cl,0x4f(%rcx,%rcx,4) 8: 28 4c 89 57 sub %cl,0x57(%rcx,%rcx,4) c: 30 4c 89 5f xor %cl,0x5f(%rcx,%rcx,4) 10: 38 48 8d cmp %cl,-0x73(%rax) 13: 76 40 jbe 0x55 15: 48 8d 7f 40 lea 0x40(%rdi),%rdi 19: ff c9 dec %ecx 1b: 75 b6 jne 0xffffffd3 1d: 89 d1 mov %edx,%ecx 1f: 83 e2 07 and $0x7,%edx 22: c1 e9 03 shr $0x3,%ecx 25: 74 12 je 0x39 27: 4c 8b 06 mov (%rsi),%r8 * 2a: 4c 89 07 mov %r8,(%rdi) <-- trapping instruction 2d: 48 8d 76 08 lea 0x8(%rsi),%rsi 31: 48 8d 7f 08 lea 0x8(%rdi),%rdi 35: ff c9 dec %ecx 37: 75 ee jne 0x27 39: 21 d2 and %edx,%edx 3b: 74 10 je 0x4d 3d: 89 d1 mov %edx,%ecx 3f: 8a .byte 0x8a