------------[ cut here ]------------ WARNING: CPU: 1 PID: 8079 at kernel/events/core.c:10369 __perf_event_overflow+0xb3b/0xe40 kernel/events/core.c:10369 Modules linked in: CPU: 1 UID: 0 PID: 8079 Comm: syz.0.554 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__perf_event_overflow+0xb3b/0xe40 kernel/events/core.c:10369 Code: 08 4c 89 f7 e8 a6 f9 34 00 4d 89 3e e9 bc fa ff ff 48 c7 44 24 40 00 00 00 00 e8 d0 55 cf ff e9 1c fe ff ff e8 c6 55 cf ff 90 <0f> 0b 90 e9 2d ff ff ff e8 b8 55 cf ff 48 c7 c7 a0 fa 73 8b e8 ec RSP: 0018:ffffc900045cea40 EFLAGS: 00010287 RAX: ffffffff81efce8a RBX: 1ffff1100f6cbc4d RCX: 0000000000080000 RDX: ffffc9000bdfb000 RSI: 0000000000006d94 RDI: 0000000000006d95 RBP: ffffc900045ceb50 R08: ffff88807b65e00f R09: 1ffff1100f6cbc01 R10: dffffc0000000000 R11: ffffed100f6cbc02 R12: dffffc0000000000 R13: ffff88807b65ddc0 R14: ffff88807b65e008 R15: 0000000000000000 FS: 00007f86f02e86c0(0000) GS:ffff888125e27000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000001000 CR3: 0000000031734000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_swevent_overflow kernel/events/core.c:10467 [inline] perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1 do_perf_sw_event kernel/events/core.c:10607 [inline] ___perf_sw_event+0x4a1/0x700 kernel/events/core.c:10634 __perf_sw_event+0xfa/0x1a0 kernel/events/core.c:10646 perf_sw_event include/linux/perf_event.h:1596 [inline] do_user_addr_fault+0x12d9/0x1380 arch/x86/mm/fault.c:1283 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: 35 04 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08 73 e8 eb c5 a4 e9 4f 35 04 00 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc900045cf098 EFLAGS: 00050206 RAX: ffffffff848cf101 RBX: ffff888069350000 RCX: 0000000000007080 RDX: 0000000000000001 RSI: 0000200000001000 RDI: ffff888069350f80 RBP: ffffc900045cf210 R08: ffff888069357fff R09: 1ffff1100d26afff R10: dffffc0000000000 R11: ffffed100d26b000 R12: dffffc0000000000 R13: 0000000000000000 R14: 00007ffffffff000 R15: 0000000000008000 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] copy_from_user_iter lib/iov_iter.c:55 [inline] iterate_iovec include/linux/iov_iter.h:52 [inline] iterate_and_advance2 include/linux/iov_iter.h:304 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] _copy_from_iter+0x493/0x1790 lib/iov_iter.c:260 copy_from_iter include/linux/uio.h:228 [inline] copy_from_iter_full include/linux/uio.h:245 [inline] ip_generic_getfrag+0xeb/0x2b0 net/ipv4/ip_output.c:938 __ip6_append_data+0x205e/0x3f30 net/ipv6/ip6_output.c:1801 ip6_make_skb+0x2ce/0x410 net/ipv6/ip6_output.c:2072 udpv6_sendmsg+0x1d1a/0x2510 net/ipv6/udp.c:1725 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xe5/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x830 net/socket.c:2630 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2684 __sys_sendmsg net/socket.c:2716 [inline] __do_sys_sendmsg net/socket.c:2721 [inline] __se_sys_sendmsg net/socket.c:2719 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2719 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f86ef38eec9 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:00007f86f02e8038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f86ef5e5fa0 RCX: 00007f86ef38eec9 RDX: 0000000000000000 RSI: 0000200000000380 RDI: 000000000000000f RBP: 00007f86ef411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f86ef5e6038 R14: 00007f86ef5e5fa0 R15: 00007ffc17ff92b8 ---------------- Code disassembly (best guess): 0: 35 04 00 66 2e xor $0x2e660004,%eax 5: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) c: 00 d: 0f 1f 00 nopl (%rax) 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 db je 0xfffffffe 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c5 jmp 0xffffffef * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: e9 4f 35 04 00 jmp 0x43580 31: 48 8b 06 mov (%rsi),%rax 34: 48 89 07 mov %rax,(%rdi) 37: 48 8d 47 08 lea 0x8(%rdi),%rax 3b: 48 83 e0 f8 and $0xfffffffffffffff8,%rax 3f: 48 rex.W