------------[ cut here ]------------ WARNING: CPU: 0 PID: 12040 at kernel/events/core.c:10369 __perf_event_overflow+0xb3b/0xe40 kernel/events/core.c:10369 Modules linked in: CPU: 0 UID: 0 PID: 12040 Comm: syz.5.1659 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 66 ff 34 00 4d 89 3e e9 bc fa ff ff 48 c7 44 24 40 00 00 00 00 e8 b0 27 cf ff e9 1c fe ff ff e8 a6 27 cf ff 90 <0f> 0b 90 e9 2d ff ff ff e8 98 27 cf ff 48 c7 c7 60 0b 74 8b e8 fc RSP: 0018:ffffc9000c8bf080 EFLAGS: 00010287 RAX: ffffffff81f0dc4a RBX: 1ffff1100de0d3b5 RCX: 0000000000080000 RDX: ffffc9000d52e000 RSI: 0000000000002981 RDI: 0000000000002982 RBP: ffffc9000c8bf190 R08: ffff88806f069b4f R09: 1ffff1100de0d369 R10: dffffc0000000000 R11: ffffed100de0d36a R12: dffffc0000000000 R13: ffff88806f069900 R14: ffff88806f069b48 R15: 0000000000000000 FS: 00007f9bc1e3b6c0(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000003000 CR3: 0000000079f7c000 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:618 RIP: 0010:rep_movs_alternative+0x4a/0x90 arch/x86/lib/copy_user_64.S:74 Code: cc cc cc 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 c3 cc cc cc cc 48 8b 06 48 89 07 48 8d 47 08 48 83 e0 f8 48 RSP: 0018:ffffc9000c8bf6b8 EFLAGS: 00050206 RAX: ffffffff84874901 RBX: ffff888079c11000 RCX: 0000000000000080 RDX: 0000000000000001 RSI: 0000200000003000 RDI: ffff888079c11f80 RBP: ffffc9000c8bf840 R08: ffff888079c11fff R09: 1ffff1100f3823ff R10: dffffc0000000000 R11: ffffed100f382400 R12: 1ffff92001917faf R13: 0000200000002080 R14: ffffc9000c8bfd88 R15: 0000000000001000 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_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:302 [inline] iterate_and_advance include/linux/iov_iter.h:330 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] _copy_from_iter+0x24f/0x1790 lib/iov_iter.c:260 copy_page_from_iter+0xdd/0x170 lib/iov_iter.c:422 skb_copy_datagram_from_iter+0x306/0x720 net/core/datagram.c:581 tun_get_user+0x1691/0x3e90 drivers/net/tun.c:1805 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:1999 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 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: 0033:0x7f9bc0f8efc9 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:00007f9bc1e3b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9bc11e5fa0 RCX: 00007f9bc0f8efc9 RDX: 000000000000fdef RSI: 0000200000000200 RDI: 00000000000000c8 RBP: 00007f9bc1011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9bc11e6038 R14: 00007f9bc11e5fa0 R15: 00007ffcece265d8 ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) a: 00 00 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: c3 ret 2d: cc int3 2e: cc int3 2f: cc int3 30: cc int3 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